From 10fc5665634151fbd8bfd6503db25a4652a0839a Mon Sep 17 00:00:00 2001 From: Steven Barth Date: Tue, 14 Jul 2015 11:05:31 +0200 Subject: ndp: fixup relay --- src/dhcpv6-ia.c | 2 +- src/ndp.c | 95 +++++++-------------------------------------------------- src/odhcpd.c | 52 ++++++++++++++++++++++++++++++- src/odhcpd.h | 3 +- 4 files changed, 65 insertions(+), 87 deletions(-) (limited to 'src') diff --git a/src/dhcpv6-ia.c b/src/dhcpv6-ia.c index 0bcb453..6ea49b0 100644 --- a/src/dhcpv6-ia.c +++ b/src/dhcpv6-ia.c @@ -363,7 +363,7 @@ static void apply_lease(struct interface *iface, struct dhcpv6_assignment *a, bo struct in6_addr prefix = addrs[i].addr; prefix.s6_addr32[1] |= htonl(a->assigned); odhcpd_setup_route(&prefix, (a->managed_size) ? addrs[i].prefix : a->length, - iface, &a->peer.sin6_addr, add); + iface, &a->peer.sin6_addr, 1024, add); } } diff --git a/src/ndp.c b/src/ndp.c index b5bab27..d5e9a39 100644 --- a/src/ndp.c +++ b/src/ndp.c @@ -37,8 +37,6 @@ 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 uint32_t rtnl_seqid = 0; static int ping_socket = -1; @@ -209,13 +207,16 @@ 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 +260,6 @@ 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 +269,7 @@ 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); } @@ -347,36 +302,25 @@ 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; @@ -399,7 +343,7 @@ 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; @@ -478,23 +422,6 @@ static void handle_rtnetlink(_unused void *addr, void *data, size_t len, 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 - nh->nlmsg_flags = NLM_F_REQUEST; - - if (nh->nlmsg_type == RTM_NEWROUTE) - 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); - send(rtnl_event.uloop.fd, nh, nh->nlmsg_len, MSG_DONTWAIT); - } - } - } } } diff --git a/src/odhcpd.c b/src/odhcpd.c index 56f4498..c411542 100644 --- a/src/odhcpd.c +++ b/src/odhcpd.c @@ -221,7 +221,7 @@ int odhcpd_iterate_interface_neighbors(const struct interface *iface, struct ndmsg *ndm = NLMSG_DATA(nhm); if (ndm->ndm_ifindex != iface->ifindex || - (ndm->ndm_state & NUD_FAILED)) + !(ndm->ndm_state & (NUD_STALE | NUD_REACHABLE | NUD_PERMANENT))) continue; struct rtattr *rta = (struct rtattr*)&ndm[1]; @@ -329,6 +329,56 @@ int odhcpd_get_preferred_interface_address(int ifindex, struct in6_addr *addr) return ret; } +void odhcpd_setup_route(const struct in6_addr *addr, int prefixlen, + const struct interface *iface, const struct in6_addr *gw, + int metric, 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_prio; + uint32_t prio; + struct rtattr rta_gw; + struct in6_addr gw; + } req = { + {sizeof(req), 0, NLM_F_REQUEST, ++rtnl_seq, 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(uint32_t), RTA_PRIORITY}, + metric, + {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_socket, &req, req.nh.nlmsg_len, MSG_DONTWAIT); +} + struct interface* odhcpd_get_interface_by_index(int ifindex) { struct interface *iface; diff --git a/src/odhcpd.h b/src/odhcpd.h index dcd2d14..729b629 100644 --- a/src/odhcpd.h +++ b/src/odhcpd.h @@ -192,7 +192,8 @@ struct interface* odhcpd_get_interface_by_index(int ifindex); struct interface* odhcpd_get_master_interface(void); int odhcpd_urandom(void *data, size_t len); void odhcpd_setup_route(const struct in6_addr *addr, int prefixlen, - const struct interface *iface, const struct in6_addr *gw, bool add); + const struct interface *iface, const struct in6_addr *gw, + int metric, bool add); void odhcpd_run(void); time_t odhcpd_time(void); -- cgit v1.2.3