nd6 defrouter: consolidate nd_defrouter manipulations in nd6_rtr.c
Move the nd_defrouter along with the sysctl handler from nd6.c to nd6_rtr.c and make the variable file static. Provide (temporary) new accessor functions for code manipulating nd_defrouter from nd6.c, and stop exporting functions no longer needed outside nd6_rtr.c. This also shuffles a few functions around in nd6_rtr.c without functional changes. Given all nd_defrouter logic is now in one place we can tidy up the code, locking and, and other open items. MFC after: 3 weeks X-MFC: keep exporting the functions Sponsored by: Netflix
This commit is contained in:
bz
parent
228fa8096b
commit
4a111320e1
@ -116,7 +116,6 @@ VNET_DEFINE(int, nd6_debug) = 0;
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static eventhandler_tag lle_event_eh, iflladdr_event_eh, ifnet_link_event_eh;
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VNET_DEFINE(struct nd_drhead, nd_defrouter);
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VNET_DEFINE(struct nd_prhead, nd_prefix);
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VNET_DEFINE(struct rwlock, nd6_lock);
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VNET_DEFINE(uint64_t, nd6_list_genid);
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@ -218,7 +217,7 @@ nd6_init(void)
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rw_init(&V_nd6_lock, "nd6 list");
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LIST_INIT(&V_nd_prefix);
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TAILQ_INIT(&V_nd_defrouter);
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nd6_defrouter_init();
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/* Start timers. */
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callout_init(&V_nd6_slowtimo_ch, 0);
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@ -901,28 +900,16 @@ nd6_timer(void *arg)
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{
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CURVNET_SET((struct vnet *) arg);
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struct epoch_tracker et;
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struct nd_drhead drq;
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struct nd_prhead prl;
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struct nd_defrouter *dr, *ndr;
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struct nd_prefix *pr, *npr;
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struct ifnet *ifp;
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struct in6_ifaddr *ia6, *nia6;
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uint64_t genid;
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TAILQ_INIT(&drq);
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LIST_INIT(&prl);
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ND6_WLOCK();
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TAILQ_FOREACH_SAFE(dr, &V_nd_defrouter, dr_entry, ndr)
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if (dr->expire && dr->expire < time_uptime)
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defrouter_unlink(dr, &drq);
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ND6_WUNLOCK();
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NET_EPOCH_ENTER(et);
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while ((dr = TAILQ_FIRST(&drq)) != NULL) {
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TAILQ_REMOVE(&drq, dr, dr_entry);
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defrouter_del(dr);
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}
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nd6_defrouter_timer();
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/*
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* expire interface addresses.
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@ -1146,34 +1133,15 @@ regen_tmpaddr(struct in6_ifaddr *ia6)
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void
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nd6_purge(struct ifnet *ifp)
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{
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struct nd_drhead drq;
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struct nd_prhead prl;
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struct nd_defrouter *dr, *ndr;
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struct nd_prefix *pr, *npr;
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TAILQ_INIT(&drq);
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LIST_INIT(&prl);
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/*
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* Nuke default router list entries toward ifp.
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* We defer removal of default router list entries that is installed
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* in the routing table, in order to keep additional side effects as
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* small as possible.
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*/
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ND6_WLOCK();
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TAILQ_FOREACH_SAFE(dr, &V_nd_defrouter, dr_entry, ndr) {
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if (dr->installed)
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continue;
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if (dr->ifp == ifp)
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defrouter_unlink(dr, &drq);
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}
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TAILQ_FOREACH_SAFE(dr, &V_nd_defrouter, dr_entry, ndr) {
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if (!dr->installed)
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continue;
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if (dr->ifp == ifp)
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defrouter_unlink(dr, &drq);
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}
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/* Purge default router list entries toward ifp. */
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nd6_defrouter_purge(ifp);
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ND6_WLOCK();
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/*
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* Remove prefixes on ifp. We should have already removed addresses on
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* this interface, so no addresses should be referencing these prefixes.
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@ -1184,11 +1152,7 @@ nd6_purge(struct ifnet *ifp)
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}
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ND6_WUNLOCK();
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/* Delete the unlinked router and prefix objects. */
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while ((dr = TAILQ_FIRST(&drq)) != NULL) {
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TAILQ_REMOVE(&drq, dr, dr_entry);
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defrouter_del(dr);
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}
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/* Delete the unlinked prefix objects. */
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while ((pr = LIST_FIRST(&prl)) != NULL) {
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LIST_REMOVE(pr, ndpr_entry);
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nd6_prefix_del(pr);
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@ -1376,7 +1340,7 @@ nd6_is_new_addr_neighbor(const struct sockaddr_in6 *addr, struct ifnet *ifp)
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* as on-link, and thus, as a neighbor.
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*/
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if (ND_IFINFO(ifp)->flags & ND6_IFF_ACCEPT_RTADV &&
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TAILQ_EMPTY(&V_nd_defrouter) &&
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nd6_defrouter_list_empty() &&
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V_nd6_defifindex == ifp->if_index) {
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return (1);
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}
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@ -1819,22 +1783,9 @@ nd6_ioctl(u_long cmd, caddr_t data, struct ifnet *ifp)
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case SIOCSRTRFLUSH_IN6:
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{
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/* flush all the default routers */
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struct nd_drhead drq;
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struct nd_defrouter *dr;
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TAILQ_INIT(&drq);
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defrouter_reset();
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ND6_WLOCK();
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while ((dr = TAILQ_FIRST(&V_nd_defrouter)) != NULL)
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defrouter_unlink(dr, &drq);
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ND6_WUNLOCK();
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while ((dr = TAILQ_FIRST(&drq)) != NULL) {
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TAILQ_REMOVE(&drq, dr, dr_entry);
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defrouter_del(dr);
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}
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nd6_defrouter_flush_all();
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defrouter_select();
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break;
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}
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@ -2626,14 +2577,9 @@ clear_llinfo_pqueue(struct llentry *ln)
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ln->la_hold = NULL;
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}
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static int nd6_sysctl_drlist(SYSCTL_HANDLER_ARGS);
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static int nd6_sysctl_prlist(SYSCTL_HANDLER_ARGS);
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SYSCTL_DECL(_net_inet6_icmp6);
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SYSCTL_PROC(_net_inet6_icmp6, ICMPV6CTL_ND6_DRLIST, nd6_drlist,
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CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_MPSAFE,
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NULL, 0, nd6_sysctl_drlist, "S,in6_defrouter",
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"NDP default router list");
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SYSCTL_PROC(_net_inet6_icmp6, ICMPV6CTL_ND6_PRLIST, nd6_prlist,
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CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_MPSAFE,
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NULL, 0, nd6_sysctl_prlist, "S,in6_prefix",
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@ -2643,42 +2589,6 @@ SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_MAXQLEN, nd6_maxqueuelen,
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SYSCTL_INT(_net_inet6_icmp6, OID_AUTO, nd6_gctimer,
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CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(nd6_gctimer), (60 * 60 * 24), "");
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static int
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nd6_sysctl_drlist(SYSCTL_HANDLER_ARGS)
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{
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struct in6_defrouter d;
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struct nd_defrouter *dr;
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int error;
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if (req->newptr != NULL)
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return (EPERM);
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error = sysctl_wire_old_buffer(req, 0);
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if (error != 0)
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return (error);
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bzero(&d, sizeof(d));
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d.rtaddr.sin6_family = AF_INET6;
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d.rtaddr.sin6_len = sizeof(d.rtaddr);
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ND6_RLOCK();
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TAILQ_FOREACH(dr, &V_nd_defrouter, dr_entry) {
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d.rtaddr.sin6_addr = dr->rtaddr;
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error = sa6_recoverscope(&d.rtaddr);
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if (error != 0)
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break;
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d.flags = dr->raflags;
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d.rtlifetime = dr->rtlifetime;
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d.expire = dr->expire + (time_second - time_uptime);
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d.if_index = dr->ifp->if_index;
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error = SYSCTL_OUT(req, &d, sizeof(d));
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if (error != 0)
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break;
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}
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ND6_RUNLOCK();
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return (error);
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}
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static int
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nd6_sysctl_prlist(SYSCTL_HANDLER_ARGS)
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{
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@ -335,7 +335,6 @@ VNET_DECLARE(int, nd6_mmaxtries);
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VNET_DECLARE(int, nd6_useloopback);
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VNET_DECLARE(int, nd6_maxnudhint);
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VNET_DECLARE(int, nd6_gctimer);
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VNET_DECLARE(struct nd_drhead, nd_defrouter);
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VNET_DECLARE(struct nd_prhead, nd_prefix);
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VNET_DECLARE(int, nd6_debug);
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VNET_DECLARE(int, nd6_onlink_ns_rfc4861);
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@ -346,7 +345,6 @@ VNET_DECLARE(int, nd6_onlink_ns_rfc4861);
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#define V_nd6_useloopback VNET(nd6_useloopback)
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#define V_nd6_maxnudhint VNET(nd6_maxnudhint)
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#define V_nd6_gctimer VNET(nd6_gctimer)
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#define V_nd_defrouter VNET(nd_defrouter)
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#define V_nd_prefix VNET(nd_prefix)
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#define V_nd6_debug VNET(nd6_debug)
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#define V_nd6_onlink_ns_rfc4861 VNET(nd6_onlink_ns_rfc4861)
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@ -477,14 +475,18 @@ void nd6_dad_stop(struct ifaddr *);
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void nd6_rs_input(struct mbuf *, int, int);
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void nd6_ra_input(struct mbuf *, int, int);
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void nd6_ifnet_link_event(void *, struct ifnet *, int);
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struct nd_defrouter *defrouter_lookup(struct in6_addr *, struct ifnet *);
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struct nd_defrouter *defrouter_lookup_locked(struct in6_addr *, struct ifnet *);
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void defrouter_reset(void);
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void defrouter_select_fib(int fibnum);
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void defrouter_select(void);
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void defrouter_ref(struct nd_defrouter *);
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void defrouter_rele(struct nd_defrouter *);
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bool defrouter_remove(struct in6_addr *, struct ifnet *);
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void defrouter_unlink(struct nd_defrouter *, struct nd_drhead *);
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void defrouter_del(struct nd_defrouter *);
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bool nd6_defrouter_list_empty(void);
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void nd6_defrouter_flush_all(void);
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void nd6_defrouter_purge(struct ifnet *);
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void nd6_defrouter_timer(void);
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void nd6_defrouter_init(void);
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int nd6_prelist_add(struct nd_prefixctl *, struct nd_defrouter *,
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struct nd_prefix **);
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void nd6_prefix_unlink(struct nd_prefix *, struct nd_prhead *);
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@ -494,8 +496,6 @@ void nd6_prefix_rele(struct nd_prefix *);
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int nd6_prefix_onlink(struct nd_prefix *);
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int nd6_prefix_offlink(struct nd_prefix *);
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void pfxlist_onlink_check(void);
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struct nd_defrouter *defrouter_lookup(struct in6_addr *, struct ifnet *);
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struct nd_defrouter *defrouter_lookup_locked(struct in6_addr *, struct ifnet *);
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struct nd_prefix *nd6_prefix_lookup(struct nd_prefixctl *);
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void rt6_flush(struct in6_addr *, struct ifnet *);
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int nd6_setdefaultiface(int);
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@ -50,6 +50,7 @@ __FBSDID("$FreeBSD$");
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#include <sys/errno.h>
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#include <sys/rmlock.h>
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#include <sys/rwlock.h>
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#include <sys/sysctl.h>
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#include <sys/syslog.h>
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#include <sys/queue.h>
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@ -91,6 +92,9 @@ static void in6_init_address_ltimes(struct nd_prefix *,
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static int rt6_deleteroute(const struct rtentry *, void *);
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VNET_DEFINE_STATIC(struct nd_drhead, nd_defrouter);
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#define V_nd_defrouter VNET(nd_defrouter)
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VNET_DECLARE(int, nd6_recalc_reachtm_interval);
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#define V_nd6_recalc_reachtm_interval VNET(nd6_recalc_reachtm_interval)
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@ -117,6 +121,37 @@ VNET_DEFINE(int, nd6_ignore_ipv6_only_ra) = 1;
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#define RTPREF_RESERVED (-2)
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#define RTPREF_INVALID (-3) /* internal */
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static void
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defrouter_ref(struct nd_defrouter *dr)
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{
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refcount_acquire(&dr->refcnt);
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}
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void
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defrouter_rele(struct nd_defrouter *dr)
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{
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if (refcount_release(&dr->refcnt))
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free(dr, M_IP6NDP);
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}
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/*
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* Remove a router from the global list and optionally stash it in a
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* caller-supplied queue.
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*/
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static void
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defrouter_unlink(struct nd_defrouter *dr, struct nd_drhead *drq)
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{
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ND6_WLOCK_ASSERT();
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TAILQ_REMOVE(&V_nd_defrouter, dr, dr_entry);
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V_nd6_list_genid++;
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if (drq != NULL)
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TAILQ_INSERT_TAIL(drq, dr, dr_entry);
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}
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/*
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* Receive Router Solicitation Message - just for routers.
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* Router solicitation/advertisement is mostly managed by userland program
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@ -670,21 +705,6 @@ defrouter_lookup(struct in6_addr *addr, struct ifnet *ifp)
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return (dr);
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}
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void
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defrouter_ref(struct nd_defrouter *dr)
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{
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refcount_acquire(&dr->refcnt);
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}
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void
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defrouter_rele(struct nd_defrouter *dr)
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{
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if (refcount_release(&dr->refcnt))
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free(dr, M_IP6NDP);
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}
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/*
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* Remove the default route for a given router.
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* This is just a subroutine function for defrouter_select_fib(), and
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@ -759,47 +779,7 @@ defrouter_reset(void)
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*/
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}
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/*
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* Look up a matching default router list entry and remove it. Returns true if a
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* matching entry was found, false otherwise.
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*/
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bool
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defrouter_remove(struct in6_addr *addr, struct ifnet *ifp)
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{
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struct nd_defrouter *dr;
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ND6_WLOCK();
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dr = defrouter_lookup_locked(addr, ifp);
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if (dr == NULL) {
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ND6_WUNLOCK();
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return (false);
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}
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defrouter_unlink(dr, NULL);
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ND6_WUNLOCK();
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defrouter_del(dr);
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defrouter_rele(dr);
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return (true);
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}
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/*
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* Remove a router from the global list and optionally stash it in a
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* caller-supplied queue.
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*
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* The ND lock must be held.
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*/
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void
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defrouter_unlink(struct nd_defrouter *dr, struct nd_drhead *drq)
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{
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ND6_WLOCK_ASSERT();
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TAILQ_REMOVE(&V_nd_defrouter, dr, dr_entry);
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V_nd6_list_genid++;
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if (drq != NULL)
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TAILQ_INSERT_TAIL(drq, dr, dr_entry);
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}
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void
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static void
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defrouter_del(struct nd_defrouter *dr)
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{
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struct nd_defrouter *deldr = NULL;
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@ -850,6 +830,30 @@ defrouter_del(struct nd_defrouter *dr)
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defrouter_rele(dr);
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}
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/*
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* Look up a matching default router list entry and remove it. Returns true if a
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* matching entry was found, false otherwise.
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*/
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bool
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defrouter_remove(struct in6_addr *addr, struct ifnet *ifp)
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{
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struct nd_defrouter *dr;
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ND6_WLOCK();
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dr = defrouter_lookup_locked(addr, ifp);
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if (dr == NULL) {
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ND6_WUNLOCK();
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return (false);
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}
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defrouter_unlink(dr, NULL);
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ND6_WUNLOCK();
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defrouter_del(dr);
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defrouter_rele(dr);
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return (true);
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}
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/*
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* Default Router Selection according to Section 6.3.6 of RFC 2461 and
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* draft-ietf-ipngwg-router-selection:
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@ -2532,3 +2536,132 @@ nd6_setdefaultiface(int ifindex)
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return (error);
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}
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static int
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nd6_sysctl_drlist(SYSCTL_HANDLER_ARGS)
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{
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struct in6_defrouter d;
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struct nd_defrouter *dr;
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int error;
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if (req->newptr != NULL)
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return (EPERM);
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error = sysctl_wire_old_buffer(req, 0);
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if (error != 0)
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return (error);
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bzero(&d, sizeof(d));
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d.rtaddr.sin6_family = AF_INET6;
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d.rtaddr.sin6_len = sizeof(d.rtaddr);
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ND6_RLOCK();
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TAILQ_FOREACH(dr, &V_nd_defrouter, dr_entry) {
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d.rtaddr.sin6_addr = dr->rtaddr;
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error = sa6_recoverscope(&d.rtaddr);
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if (error != 0)
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break;
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d.flags = dr->raflags;
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d.rtlifetime = dr->rtlifetime;
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d.expire = dr->expire + (time_second - time_uptime);
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d.if_index = dr->ifp->if_index;
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error = SYSCTL_OUT(req, &d, sizeof(d));
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if (error != 0)
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break;
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}
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ND6_RUNLOCK();
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return (error);
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}
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||||
SYSCTL_DECL(_net_inet6_icmp6);
|
||||
SYSCTL_PROC(_net_inet6_icmp6, ICMPV6CTL_ND6_DRLIST, nd6_drlist,
|
||||
CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_MPSAFE,
|
||||
NULL, 0, nd6_sysctl_drlist, "S,in6_defrouter",
|
||||
"NDP default router list");
|
||||
|
||||
bool
|
||||
nd6_defrouter_list_empty(void)
|
||||
{
|
||||
|
||||
return (TAILQ_EMPTY(&V_nd_defrouter));
|
||||
}
|
||||
|
||||
void
|
||||
nd6_defrouter_timer(void)
|
||||
{
|
||||
struct nd_defrouter *dr, *ndr;
|
||||
struct nd_drhead drq;
|
||||
|
||||
TAILQ_INIT(&drq);
|
||||
|
||||
ND6_WLOCK();
|
||||
TAILQ_FOREACH_SAFE(dr, &V_nd_defrouter, dr_entry, ndr)
|
||||
if (dr->expire && dr->expire < time_uptime)
|
||||
defrouter_unlink(dr, &drq);
|
||||
ND6_WUNLOCK();
|
||||
|
||||
while ((dr = TAILQ_FIRST(&drq)) != NULL) {
|
||||
TAILQ_REMOVE(&drq, dr, dr_entry);
|
||||
defrouter_del(dr);
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* Nuke default router list entries toward ifp.
|
||||
* We defer removal of default router list entries that is installed in the
|
||||
* routing table, in order to keep additional side effects as small as possible.
|
||||
*/
|
||||
void
|
||||
nd6_defrouter_purge(struct ifnet *ifp)
|
||||
{
|
||||
struct nd_defrouter *dr, *ndr;
|
||||
struct nd_drhead drq;
|
||||
|
||||
TAILQ_INIT(&drq);
|
||||
|
||||
ND6_WLOCK();
|
||||
TAILQ_FOREACH_SAFE(dr, &V_nd_defrouter, dr_entry, ndr) {
|
||||
if (dr->installed)
|
||||
continue;
|
||||
if (dr->ifp == ifp)
|
||||
defrouter_unlink(dr, &drq);
|
||||
}
|
||||
TAILQ_FOREACH_SAFE(dr, &V_nd_defrouter, dr_entry, ndr) {
|
||||
if (!dr->installed)
|
||||
continue;
|
||||
if (dr->ifp == ifp)
|
||||
defrouter_unlink(dr, &drq);
|
||||
}
|
||||
ND6_WUNLOCK();
|
||||
|
||||
/* Delete the unlinked router objects. */
|
||||
while ((dr = TAILQ_FIRST(&drq)) != NULL) {
|
||||
TAILQ_REMOVE(&drq, dr, dr_entry);
|
||||
defrouter_del(dr);
|
||||
}
|
||||
}
|
||||
|
||||
void
|
||||
nd6_defrouter_flush_all(void)
|
||||
{
|
||||
struct nd_defrouter *dr;
|
||||
struct nd_drhead drq;
|
||||
|
||||
TAILQ_INIT(&drq);
|
||||
|
||||
ND6_WLOCK();
|
||||
while ((dr = TAILQ_FIRST(&V_nd_defrouter)) != NULL)
|
||||
defrouter_unlink(dr, &drq);
|
||||
ND6_WUNLOCK();
|
||||
|
||||
while ((dr = TAILQ_FIRST(&drq)) != NULL) {
|
||||
TAILQ_REMOVE(&drq, dr, dr_entry);
|
||||
defrouter_del(dr);
|
||||
}
|
||||
}
|
||||
|
||||
void
|
||||
nd6_defrouter_init(void)
|
||||
{
|
||||
|
||||
TAILQ_INIT(&V_nd_defrouter);
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user