X-Git-Url: http://git.archive.openwrt.org/?p=project%2Fodhcpd.git;a=blobdiff_plain;f=src%2Fndp.c;h=95eb18fce5a57e78474352435f9b03e6646e75d9;hp=b5bab27c1e2103d3d99014c2ec9a583a5252a8b4;hb=e60710d1fe0c5bf19b9acf9b116e0645e8e114d1;hpb=83487419ce34d2a1f6fe22b437172882c9cd8785 diff --git a/src/ndp.c b/src/ndp.c index b5bab27..95eb18f 100644 --- a/src/ndp.c +++ b/src/ndp.c @@ -29,6 +29,7 @@ #include #include #include "router.h" +#include "dhcpv6.h" #include "ndp.h" @@ -37,12 +38,11 @@ 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 catch_rtnetlink(int error); static uint32_t rtnl_seqid = 0; static int ping_socket = -1; -static struct odhcpd_event rtnl_event = {{.fd = -1}, handle_rtnetlink}; +static struct odhcpd_event rtnl_event = {{.fd = -1}, handle_rtnetlink, catch_rtnetlink}; // Filter ICMPv6 messages of type neighbor soliciation @@ -61,10 +61,15 @@ static const struct sock_fprog bpf_prog = {sizeof(bpf) / sizeof(*bpf), bpf}; // Initialize NDP-proxy int init_ndp(void) { + int val = 256 * 1024; + // Setup netlink socket if ((rtnl_event.uloop.fd = odhcpd_open_rtnl()) < 0) return -1; + if (setsockopt(rtnl_event.uloop.fd, SOL_SOCKET, SO_RCVBUF, &val, sizeof(val))) + setsockopt(rtnl_event.uloop.fd, SOL_SOCKET, SO_RCVBUFFORCE, &val, sizeof(val)); + // Receive netlink neighbor and ip-address events uint32_t group = RTNLGRP_IPV6_IFADDR; setsockopt(rtnl_event.uloop.fd, SOL_NETLINK, @@ -82,7 +87,7 @@ int init_ndp(void) return -1; } - int val = 2; + val = 2; setsockopt(ping_socket, IPPROTO_RAW, IPV6_CHECKSUM, &val, sizeof(val)); // This is required by RFC 4861 @@ -209,13 +214,16 @@ int setup_ndp_interface(struct interface *iface, bool enable) // 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, iface->ifindex}; struct icmp6_hdr echo = {.icmp6_type = ICMP6_ECHO_REQUEST}; struct iovec iov = {&echo, sizeof(echo)}; - return odhcpd_send(ping_socket, &dest, &iov, 1, iface); + + 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); } @@ -259,52 +267,6 @@ static void handle_solicit(void *addr, void *data, size_t len, ping6(&req->nd_ns_target, c); } - -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_STATIC; - 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; - } - - req.nh.nlmsg_len = (gw) ? sizeof(req) : offsetof(struct req, rta_gw); - send(rtnl_event.uloop.fd, &req, req.nh.nlmsg_len, MSG_DONTWAIT); -} - // Use rtnetlink to modify kernel routes static void setup_route(struct in6_addr *addr, struct interface *iface, bool add) { @@ -314,7 +276,59 @@ static void setup_route(struct in6_addr *addr, struct interface *iface, bool add (add) ? "Learned" : "Forgot", namebuf, iface->ifname); if (iface->learn_routes) - odhcpd_setup_route(addr, 128, iface, NULL, add); + odhcpd_setup_route(addr, 128, iface, NULL, 1024, add); +} + +// compare prefixes +static int prefixcmp(const void *va, const void *vb) +{ + const struct odhcpd_ipaddr *a = va, *b = vb; + uint32_t a_pref = ((a->addr.s6_addr[0] & 0xfe) != 0xfc) ? a->preferred : 1; + uint32_t b_pref = ((b->addr.s6_addr[0] & 0xfe) != 0xfc) ? b->preferred : 1; + return (a_pref < b_pref) ? 1 : (a_pref > b_pref) ? -1 : 0; +} + +// Check address update +static void check_updates(struct interface *iface) +{ + struct odhcpd_ipaddr addr[8] = {{IN6ADDR_ANY_INIT, 0, 0, 0, 0}}; + time_t now = odhcpd_time(); + ssize_t len = odhcpd_get_interface_addresses(iface->ifindex, addr, 8); + + if (len < 0) + return; + + qsort(addr, len, sizeof(*addr), prefixcmp); + + for (int i = 0; i < len; ++i) { + addr[i].addr.s6_addr32[3] = 0; + + if (addr[i].preferred < UINT32_MAX - now) + addr[i].preferred += now; + + if (addr[i].valid < UINT32_MAX - now) + addr[i].valid += now; + } + + 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) + raise(SIGUSR1); } @@ -347,44 +361,28 @@ static void handle_rtnetlink(_unused void *addr, void *data, size_t len, // Inform about a change in default route if (is_route && rtm->rtm_dst_len == 0) raise(SIGUSR1); - else if (is_route && rtm->rtm_dst_len == 128) + else if (is_route) continue; // Data to retrieve - size_t rta_offset = (is_route) ? sizeof(*rtm) : (is_addr) ? - sizeof(struct ifaddrmsg) : sizeof(*ndm); - uint16_t atype = (is_route) ? RTA_DST : (is_addr) ? IFA_ADDRESS : NDA_DST; + size_t rta_offset = (is_addr) ? sizeof(struct ifaddrmsg) : sizeof(*ndm); + uint16_t atype = (is_addr) ? IFA_ADDRESS : NDA_DST; ssize_t alen = NLMSG_PAYLOAD(nh, rta_offset); struct in6_addr *addr = NULL; - int *ifindex = (!is_route) ? &ndm->ndm_ifindex : NULL; - int *metric = 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); - } else if (is_route && rta->rta_type == RTA_OIF && - RTA_PAYLOAD(rta) == sizeof(int)) { - ifindex = (int*)RTA_DATA(rta); - } else if (is_route && rta->rta_type == RTA_GATEWAY) { - ifindex = NULL; - break; - } else if (is_route && rta->rta_type == RTA_PRIORITY) { - metric = (int*)RTA_DATA(rta); } } // Lookup interface - struct interface *iface = ifindex ? odhcpd_get_interface_by_index(*ifindex) : NULL; + struct interface *iface = odhcpd_get_interface_by_index(ndm->ndm_ifindex); if (!iface) continue; - // Keep-alive neighbor entries for RA sending - if (nh->nlmsg_type == RTM_DELNEIGH && !(ndm->ndm_state & NUD_FAILED) && - addr && IN6_IS_ADDR_LINKLOCAL(addr) && iface->ra == RELAYD_SERVER) - ping6(addr, iface); - // Address not specified or unrelated if (!addr || IN6_IS_ADDR_LINKLOCAL(addr) || IN6_IS_ADDR_MULTICAST(addr)) @@ -399,7 +397,7 @@ static void handle_rtnetlink(_unused void *addr, void *data, size_t len, (NUD_REACHABLE | NUD_STALE | NUD_DELAY | NUD_PROBE | NUD_PERMANENT | NUD_NOARP))); - if (iface->ndp == RELAYD_RELAY && !is_route) { + if (iface->ndp == RELAYD_RELAY) { // Replay change to all neighbor cache struct { struct nlmsghdr nh; @@ -473,24 +471,22 @@ static void handle_rtnetlink(_unused void *addr, void *data, size_t len, } if (is_addr) { - if (iface->ra == RELAYD_SERVER) - raise(SIGUSR1); // Inform about a change in addresses + check_updates(iface); if (iface->dhcpv6 == RELAYD_SERVER) iface->ia_reconf = true; - } else if (is_route) { + if (iface->ndp == RELAYD_RELAY && iface->master) { - // Replay on-link route changes on all slave interfaces + // Replay address changes on all slave interfaces nh->nlmsg_flags = NLM_F_REQUEST; - if (nh->nlmsg_type == RTM_NEWROUTE) + 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) { - *ifindex = c->ifindex; - *metric = (*metric & 0xffff) | (c->ifindex << 16); + ndm->ndm_ifindex = c->ifindex; send(rtnl_event.uloop.fd, nh, nh->nlmsg_len, MSG_DONTWAIT); } } @@ -501,3 +497,18 @@ static void handle_rtnetlink(_unused void *addr, void *data, size_t len, if (dump_neigh) dump_neigh_table(false); } + +static void catch_rtnetlink(int error) +{ + if (error == ENOBUFS) { + 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); + } +}