92f8878cbf
Multiple IPs in the same IP prefix confuse the direct protocol and could cause withdrawal of a valid prefix. Thanks to Dan Rimal for a bugreport.
119 lines
2.8 KiB
C
119 lines
2.8 KiB
C
/*
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* BIRD -- Direct Device Routes
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*
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* (c) 1998--2000 Martin Mares <mj@ucw.cz>
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*
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* Can be freely distributed and used under the terms of the GNU GPL.
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*/
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/**
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* DOC: Direct
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*
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* The Direct protocol works by converting all ifa_notify() events it receives
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* to rte_update() calls for the corresponding network.
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*/
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#undef LOCAL_DEBUG
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#include "nest/bird.h"
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#include "nest/iface.h"
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#include "nest/protocol.h"
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#include "nest/route.h"
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#include "nest/rt-dev.h"
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#include "conf/conf.h"
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#include "lib/resource.h"
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#include "lib/string.h"
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static void
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dev_ifa_notify(struct proto *p, unsigned c, struct ifa *ad)
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{
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struct rt_dev_config *P = (void *) p->cf;
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if (!EMPTY_LIST(P->iface_list) &&
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!iface_patt_find(&P->iface_list, ad->iface, ad->iface->addr))
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/* Empty list is automagically treated as "*" */
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return;
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if (ad->flags & IA_SECONDARY)
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return;
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if (ad->scope <= SCOPE_LINK)
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return;
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if (c & IF_CHANGE_DOWN)
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{
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net *n;
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DBG("dev_if_notify: %s:%I going down\n", ad->iface->name, ad->ip);
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n = net_find(p->table, ad->prefix, ad->pxlen);
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if (!n)
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{
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DBG("dev_if_notify: device shutdown: prefix not found\n");
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return;
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}
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rte_update(p->table, n, p, p, NULL);
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}
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else if (c & IF_CHANGE_UP)
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{
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rta *a, A;
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net *n;
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rte *e;
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DBG("dev_if_notify: %s:%I going up\n", ad->iface->name, ad->ip);
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bzero(&A, sizeof(A));
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A.proto = p;
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A.source = RTS_DEVICE;
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A.scope = SCOPE_UNIVERSE;
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A.cast = RTC_UNICAST;
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A.dest = RTD_DEVICE;
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A.iface = ad->iface;
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A.eattrs = NULL;
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a = rta_lookup(&A);
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n = net_get(p->table, ad->prefix, ad->pxlen);
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e = rte_get_temp(a);
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e->net = n;
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e->pflags = 0;
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rte_update(p->table, n, p, p, e);
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}
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}
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static struct proto *
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dev_init(struct proto_config *c)
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{
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struct proto *p = proto_new(c, sizeof(struct proto));
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p->ifa_notify = dev_ifa_notify;
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return p;
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}
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static int
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dev_reconfigure(struct proto *p, struct proto_config *new)
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{
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struct rt_dev_config *o = (struct rt_dev_config *) p->cf;
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struct rt_dev_config *n = (struct rt_dev_config *) new;
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return iface_patts_equal(&o->iface_list, &n->iface_list, NULL);
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}
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static void
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dev_copy_config(struct proto_config *dest, struct proto_config *src)
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{
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struct rt_dev_config *d = (struct rt_dev_config *) dest;
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struct rt_dev_config *s = (struct rt_dev_config *) src;
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/*
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* We copy iface_list as ifaces can be shared by more direct protocols.
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* Copy suffices to be is shallow, because new nodes can be added, but
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* old nodes cannot be modified (although they contain internal lists).
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*/
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cfg_copy_list(&d->iface_list, &s->iface_list, sizeof(struct iface_patt));
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}
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struct protocol proto_device = {
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name: "Direct",
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template: "direct%d",
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preference: DEF_PREF_DIRECT,
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init: dev_init,
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reconfigure: dev_reconfigure,
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copy_config: dev_copy_config
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};
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