/* * BIRD -- Direct Device Routes * * (c) 1998--2000 Martin Mares <mj@ucw.cz> * * Can be freely distributed and used under the terms of the GNU GPL. */ /** * DOC: Direct * * The Direct protocol works by converting all ifa_notify() events it receives * to rte_update() calls for the corresponding network. */ #undef LOCAL_DEBUG #include "nest/bird.h" #include "nest/iface.h" #include "nest/protocol.h" #include "nest/route.h" #include "nest/rt-dev.h" #include "conf/conf.h" #include "lib/resource.h" #include "lib/string.h" static void dev_ifa_notify(struct proto *p, unsigned c, struct ifa *ad) { struct rt_dev_config *P = (void *) p->cf; if (!EMPTY_LIST(P->iface_list) && !iface_patt_find(&P->iface_list, ad->iface, ad->iface->addr)) /* Empty list is automagically treated as "*" */ return; if (ad->flags & IA_SECONDARY) return; if (ad->scope <= SCOPE_LINK) return; if (c & IF_CHANGE_DOWN) { net *n; DBG("dev_if_notify: %s:%I going down\n", ad->iface->name, ad->ip); n = net_find(p->table, ad->prefix, ad->pxlen); if (!n) { DBG("dev_if_notify: device shutdown: prefix not found\n"); return; } /* Use iface ID as local source ID */ struct rte_src *src = rt_get_source(p, ad->iface->index); rte_update2(p->main_ahook, n, NULL, src); } else if (c & IF_CHANGE_UP) { rta *a; net *n; rte *e; DBG("dev_if_notify: %s:%I going up\n", ad->iface->name, ad->ip); if (P->check_link && !(ad->iface->flags & IF_LINK_UP)) return; /* Use iface ID as local source ID */ struct rte_src *src = rt_get_source(p, ad->iface->index); rta a0 = { .src = src, .source = RTS_DEVICE, .scope = SCOPE_UNIVERSE, .cast = RTC_UNICAST, .dest = RTD_DEVICE, .iface = ad->iface }; a = rta_lookup(&a0); n = net_get(p->table, ad->prefix, ad->pxlen); e = rte_get_temp(a); e->net = n; e->pflags = 0; rte_update2(p->main_ahook, n, e, src); } } static void dev_if_notify(struct proto *p, uint c, struct iface *iface) { struct rt_dev_config *cf = (void *) p->cf; if (c & (IF_CHANGE_UP | IF_CHANGE_DOWN)) return; if ((c & IF_CHANGE_LINK) && cf->check_link) { uint ac = (iface->flags & IF_LINK_UP) ? IF_CHANGE_UP : IF_CHANGE_DOWN; struct ifa *a; WALK_LIST(a, iface->addrs) dev_ifa_notify(p, ac, a); } } static struct proto * dev_init(struct proto_config *c) { struct proto *p = proto_new(c, sizeof(struct proto)); p->if_notify = dev_if_notify; p->ifa_notify = dev_ifa_notify; return p; } static int dev_reconfigure(struct proto *p, struct proto_config *new) { struct rt_dev_config *o = (struct rt_dev_config *) p->cf; struct rt_dev_config *n = (struct rt_dev_config *) new; return iface_patts_equal(&o->iface_list, &n->iface_list, NULL) && (o->check_link == n->check_link); } static void dev_copy_config(struct proto_config *dest, struct proto_config *src) { struct rt_dev_config *d = (struct rt_dev_config *) dest; struct rt_dev_config *s = (struct rt_dev_config *) src; /* * We copy iface_list as ifaces can be shared by more direct protocols. * Copy suffices to be is shallow, because new nodes can be added, but * old nodes cannot be modified (although they contain internal lists). */ cfg_copy_list(&d->iface_list, &s->iface_list, sizeof(struct iface_patt)); d->check_link = s->check_link; } struct protocol proto_device = { .name = "Direct", .template = "direct%d", .preference = DEF_PREF_DIRECT, .config_size = sizeof(struct rt_dev_config), .init = dev_init, .reconfigure = dev_reconfigure, .copy_config = dev_copy_config };