From 00c1821a90b45beb31335447dc28853d956d1dbc Mon Sep 17 00:00:00 2001 From: Steven Barth Date: Tue, 30 Jun 2015 11:06:20 +0200 Subject: [PATCH] ra: keep alive neighbor entries so we can send unicast RAs in the future --- src/ndp.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/src/ndp.c b/src/ndp.c index 5e8b5ac..5fc95dd 100644 --- a/src/ndp.c +++ b/src/ndp.c @@ -212,7 +212,7 @@ int setup_ndp_interface(struct interface *iface, bool enable) static ssize_t ping6(struct in6_addr *addr, const struct interface *iface) { - struct sockaddr_in6 dest = {AF_INET6, 0, 0, *addr, 0}; + 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)}; @@ -370,6 +370,11 @@ static void handle_rtnetlink(_unused void *addr, void *data, size_t len, RTA_PAYLOAD(rta) >= sizeof(*addr)) addr = RTA_DATA(rta); + // 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)) -- 2.25.1