/* * 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/rt.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, uint flags, struct ifa *ad) { struct rt_dev_proto *p = (void *) P; struct rt_dev_config *cf = (void *) P->cf; struct channel *c; net_addr *net = &ad->prefix; if (!EMPTY_LIST(cf->iface_list) && !iface_patt_find(&cf->iface_list, ad->iface, ad)) /* Empty list is automatically treated as "*" */ return; if (ad->flags & IA_SECONDARY) return; if (ad->scope <= SCOPE_LINK) return; if (ad->prefix.type == NET_IP4) c = p->ip4_channel; else if (ad->prefix.type == NET_IP6) c = p->ip6_channel; else return; if (!c) return; /* For IPv6 SADR, replace regular prefix with SADR prefix */ if (c->net_type == NET_IP6_SADR) { net = alloca(sizeof(net_addr_ip6_sadr)); net_fill_ip6_sadr(net, net6_prefix(&ad->prefix), net6_pxlen(&ad->prefix), IP6_NONE, 0); } if (flags & IF_CHANGE_DOWN) { DBG("dev_if_notify: %s:%I going down\n", ad->iface->name, ad->ip); /* Use iface ID as local source ID */ struct rte_src *src = rt_get_source(P, ad->iface->index); rte_update(c, net, NULL, src); rt_unlock_source(src); } else if (flags & IF_CHANGE_UP) { DBG("dev_if_notify: %s:%I going up\n", ad->iface->name, ad->ip); if (cf->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); ea_list *ea = NULL; struct nexthop_adata nhad = { .nh = { .iface = ad->iface, }, .ad = { .length = (void *) NEXTHOP_NEXT(&nhad.nh) - (void *) nhad.ad.data, }, }; ea_set_attr_u32(&ea, &ea_gen_preference, 0, c->preference); ea_set_attr_u32(&ea, &ea_gen_source, 0, RTS_DEVICE); ea_set_attr_data(&ea, &ea_gen_nexthop, 0, nhad.ad.data, nhad.ad.length); rte e0 = { .attrs = ea, .src = src, }; rte_update(c, net, &e0, src); rt_unlock_source(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 void dev_postconfig(struct proto_config *CF) { struct rt_dev_config *cf = (void *) CF; struct channel_config *ip4, *ip6, *ip6_sadr; ip4 = proto_cf_find_channel(CF, NET_IP4); ip6 = proto_cf_find_channel(CF, NET_IP6); ip6_sadr = proto_cf_find_channel(CF, NET_IP6_SADR); if (ip6 && ip6_sadr) cf_error("Both ipv6 and ipv6-sadr channels"); cf->ip4_channel = ip4; cf->ip6_channel = ip6 ?: ip6_sadr; } static struct proto * dev_init(struct proto_config *CF) { struct proto *P = proto_new(CF); struct rt_dev_proto *p = (void *) P; struct rt_dev_config *cf = (void *) CF; proto_configure_channel(P, &p->ip4_channel, cf->ip4_channel); proto_configure_channel(P, &p->ip6_channel, cf->ip6_channel); P->if_notify = dev_if_notify; P->ifa_notify = dev_ifa_notify; return P; } static int dev_reconfigure(struct proto *P, struct proto_config *CF) { struct rt_dev_proto *p = (void *) P; struct rt_dev_config *o = (void *) P->cf; struct rt_dev_config *n = (void *) CF; if (!iface_patts_equal(&o->iface_list, &n->iface_list, NULL) || (o->check_link != n->check_link)) return 0; return proto_configure_channel(P, &p->ip4_channel, n->ip4_channel) && proto_configure_channel(P, &p->ip6_channel, n->ip6_channel); return 1; } static void dev_copy_config(struct proto_config *dest, struct proto_config *src) { struct rt_dev_config *d = (void *) dest; struct rt_dev_config *s = (void *) 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, .channel_mask = NB_IP | NB_IP6_SADR, .proto_size = sizeof(struct rt_dev_proto), .config_size = sizeof(struct rt_dev_config), .postconfig = dev_postconfig, .init = dev_init, .reconfigure = dev_reconfigure, .copy_config = dev_copy_config }; void dev_build(void) { proto_build(&proto_device); }