ndp: detect ifindex changes via interface netlink events

[project/odhcpd.git] / src / ndp.c

diff --git a/src/ndp.c b/src/ndp.c
index e0e865f..ec990ed 100644 (file)
--- a/src/ndp.c
+++ b/src/ndp.c
@@ -95,7 +95,7 @@ int init_ndp(void)
        // Receive IPv4 address, IPv6 address, IPv6 routes and neighbor events
        if (nl_socket_add_memberships(rtnl_event.sock, RTNLGRP_IPV4_IFADDR,
                                RTNLGRP_IPV6_IFADDR, RTNLGRP_IPV6_ROUTE,
-                               RTNLGRP_NEIGH, 0))
+                               RTNLGRP_NEIGH, RTNLGRP_LINK, 0))
                goto err;
 
        odhcpd_register(&rtnl_event.ev);
@@ -415,6 +415,29 @@ static int cb_rtnl_valid(struct nl_msg *msg, _unused void *arg)
        char ipbuf[INET6_ADDRSTRLEN];
 
        switch (hdr->nlmsg_type) {
+       case RTM_NEWLINK: {
+               struct ifinfomsg *ifi = nlmsg_data(hdr);
+               struct nlattr *nla[__IFLA_MAX];
+
+               if (!nlmsg_valid_hdr(hdr, sizeof(*ifi)) ||
+                               ifi->ifi_family != AF_UNSPEC)
+                       return NL_SKIP;
+
+               nlmsg_parse(hdr, sizeof(struct ifinfomsg), nla, __IFLA_MAX - 1, NULL);
+               if (!nla[IFLA_IFNAME])
+                       return NL_SKIP;
+
+               struct interface *iface = odhcpd_get_interface_by_name(nla_data(nla[IFLA_IFNAME]));
+               if (!iface)
+                       return NL_SKIP;
+
+               if (iface->ifindex != ifi->ifi_index) {
+                       iface->ifindex = ifi->ifi_index;
+                       check_addr_updates(iface);
+               }
+               break;
+       }
+
        case RTM_NEWROUTE:
        case RTM_DELROUTE: {
                struct rtmsg *rtm = nlmsg_data(hdr);
@@ -427,7 +450,7 @@ static int cb_rtnl_valid(struct nl_msg *msg, _unused void *arg)
                        syslog(LOG_INFO, "Raising SIGUSR1 due to default route change");
                        raise(SIGUSR1);
                }
-               return NL_OK;
+               break;
        }
 
        case RTM_NEWADDR: