Rewritten kernel syncer. Now uses the rta trickery I've introduced yesterday
and does things "the right way". Few things are still missing (device routes etc.), I'll add them later in the evening.
This commit is contained in:
Martin Mares
parent
04925e9040
commit
f39e4713c2
4 changed files with 136 additions and 90 deletions
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@ -28,54 +28,39 @@ static int krt_scan_fd = -1;
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/* FIXME: Filtering */
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static void
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krt_magic_route(struct krt_proto *p, net *net, ip_addr gw)
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static int
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krt_uptodate(rte *k, rte *e)
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{
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neighbor *ng;
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rta a, *t;
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rte *e;
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rta *ka = k->attrs, *ea = e->attrs;
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ng = neigh_find(&p->p, &gw, 0);
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if (!ng)
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{
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log(L_ERR "Kernel told us to use non-neighbor %I for %I/%d\n", gw, net->n.prefix, net->n.pxlen);
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return;
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}
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a.proto = &p->p;
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a.source = RTS_INHERIT;
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a.scope = SCOPE_UNIVERSE;
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a.cast = RTC_UNICAST;
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a.dest = RTD_ROUTER;
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a.tos = 0;
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a.flags = 0;
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a.gw = gw;
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a.from = IPA_NONE;
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a.iface = ng->iface;
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a.attrs = NULL;
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t = rta_lookup(&a);
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e = rte_get_temp(t);
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e->net = net;
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rte_update(net, &p->p, e);
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if (ka->dest != ea->dest)
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return 0;
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if (ka->dest == RTD_ROUTER && !ipa_equal(ka->gw, ea->gw))
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return 0;
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/* FIXME: Device routes */
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return 1;
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}
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static void
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krt_parse_entry(byte *e, struct krt_proto *p)
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krt_parse_entry(byte *ent, struct krt_proto *p)
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{
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u32 dest0, gw0, mask0;
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ip_addr dest, gw, mask;
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unsigned int flags;
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unsigned int flags, verdict;
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int masklen;
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net *net;
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byte *iface = e;
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byte *iface = ent;
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rta a;
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rte *e, *old;
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if (sscanf(e, "%*s\t%x\t%x\t%x\t%*d\t%*d\t%*d\t%x\t", &dest0, &gw0, &flags, &mask0) != 4)
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if (sscanf(ent, "%*s\t%x\t%x\t%x\t%*d\t%*d\t%*d\t%x\t", &dest0, &gw0, &flags, &mask0) != 4)
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{
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log(L_ERR "krt read: unable to parse `%s'", e);
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log(L_ERR "krt read: unable to parse `%s'", ent);
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return;
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}
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while (*e != '\t')
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e++;
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*e = 0;
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while (*ent != '\t')
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ent++;
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*ent = 0;
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dest = ipa_from_u32(dest0);
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ipa_ntoh(dest);
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@ -99,47 +84,69 @@ krt_parse_entry(byte *e, struct krt_proto *p)
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log(L_WARN "krt: Ignoring redirect to %I/%d via %I", dest, masklen, gw);
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return;
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}
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net = net_get(&master_table, 0, dest, masklen);
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if (net->routes)
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a.proto = &p->p;
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a.source = RTS_INHERIT;
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a.scope = SCOPE_UNIVERSE;
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a.cast = RTC_UNICAST;
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a.tos = a.flags = a.aflags = 0;
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a.from = IPA_NONE;
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a.iface = NULL;
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a.attrs = NULL;
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if (flags & RTF_GATEWAY)
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{
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rte *e = net->routes;
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rta *a = e->attrs;
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int ok;
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switch (a->dest)
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{
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case RTD_ROUTER:
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ok = (flags & RTF_GATEWAY) && ipa_equal(gw, a->gw);
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break;
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case RTD_DEVICE:
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#ifdef CONFIG_AUTO_ROUTES
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ok = 1;
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/* FIXME: What about static interface routes? */
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#else
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ok = !(flags & RTF_GATEWAY) && !strcmp(iface, a->iface->name);
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#endif
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break;
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case RTD_UNREACHABLE:
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ok = flags & RTF_REJECT;
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break;
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default:
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ok = 0;
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neighbor *ng = neigh_find(&p->p, &gw, 0);
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if (ng)
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a.iface = ng->iface;
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else
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/* FIXME: Remove this warning? */
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log(L_WARN "Kernel told us to use non-neighbor %I for %I/%d\n", gw, net->n.prefix, net->n.pxlen);
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a.dest = RTD_ROUTER;
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a.gw = gw;
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}
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net->n.flags |= ok ? KRF_SEEN : KRF_UPDATE;
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else if (flags & RTF_REJECT)
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{
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a.dest = RTD_UNREACHABLE;
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a.gw = IPA_NONE;
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}
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else
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{
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#ifdef CONFIG_AUTO_ROUTES
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if (!(flags & RTF_GATEWAY)) /* It's a device route */
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/* FIXME: Should support interface routes? */
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/* FIXME: What about systems not generating their own if routes? (see CONFIG_AUTO_ROUTES) */
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return;
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#endif
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DBG("krt_parse_entry: kernel reporting unknown route %I/%d\n", dest, masklen);
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if (p->scanopt.learn)
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}
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e = rte_get_temp(&a);
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e->net = net;
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old = net->routes;
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if (old && !krt_capable(old))
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old = NULL;
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if (old)
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{
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if (flags & RTF_GATEWAY)
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krt_magic_route(p, net, gw);
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if (krt_uptodate(e, net->routes))
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verdict = KRF_SEEN;
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else
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verdict = KRF_UPDATE;
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}
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net->n.flags |= KRF_UPDATE;
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else if (p->scanopt.learn && !net->routes)
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verdict = KRF_LEARN;
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else
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verdict = KRF_DELETE;
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DBG("krt_parse_entry: verdict %d\n", verdict);
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net->n.flags = verdict;
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if (verdict != KRF_SEEN)
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{
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/* Get a cached copy of attributes and link the route */
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e->attrs = rta_lookup(e->attrs);
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e->next = net->routes;
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net->routes = e;
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}
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else
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rte_free(e);
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}
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static int
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@ -187,7 +194,7 @@ krt_scan_proc(struct krt_proto *p)
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}
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static void
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krt_prune(void)
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krt_prune(struct krt_proto *p)
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{
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struct rtable *t = &master_table;
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struct fib_node *f;
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@ -200,24 +207,57 @@ krt_prune(void)
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FIB_WALK(&t->fib, f)
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{
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net *n = (net *) f;
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switch (f->flags)
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int verdict = f->flags;
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rte *new, *old;
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if (verdict != KRF_CREATE && verdict != KRF_SEEN)
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{
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case KRF_UPDATE:
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DBG("krt_prune: removing %I/%d\n", n->n.prefix, n->n.pxlen);
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krt_remove_route(n, NULL);
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/* Fall-thru */
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case 0:
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if (n->routes)
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old = n->routes;
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n->routes = old->next;
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}
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else
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old = NULL;
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new = n->routes;
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switch (verdict)
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{
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case KRF_CREATE:
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if (new)
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{
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if (new->attrs->source == RTS_INHERIT)
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{
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DBG("krt_prune: removing inherited %I/%d\n", n->n.prefix, n->n.pxlen);
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rte_update(n, &p->p, NULL);
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}
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else
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{
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DBG("krt_prune: reinstalling %I/%d\n", n->n.prefix, n->n.pxlen);
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krt_add_route(n, n->routes);
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krt_add_route(new);
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}
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}
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break;
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case KRF_SEEN:
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/* Nothing happens */
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break;
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case KRF_UPDATE:
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DBG("krt_prune: updating %I/%d\n", n->n.prefix, n->n.pxlen);
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krt_remove_route(old);
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krt_add_route(new);
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break;
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case KRF_DELETE:
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DBG("krt_prune: deleting %I/%d\n", n->n.prefix, n->n.pxlen);
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krt_remove_route(old);
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break;
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case KRF_LEARN:
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DBG("krt_prune: learning %I/%d\n", n->n.prefix, n->n.pxlen);
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rte_update(n, &p->p, new);
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break;
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default:
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die("krt_prune: invalid route status");
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}
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if (old)
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rte_free(old);
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f->flags = 0;
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}
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FIB_WALK_END;
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@ -229,7 +269,7 @@ krt_scan_fire(timer *t)
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struct krt_proto *p = t->data;
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if (krt_scan_proc(p))
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krt_prune();
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krt_prune(p);
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}
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void
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@ -22,7 +22,7 @@
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#include "lib/krt.h"
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int
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krt_capable(net *net, rte *e)
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krt_capable(rte *e)
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{
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rta *a = e->attrs;
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@ -40,11 +40,12 @@ krt_capable(net *net, rte *e)
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}
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void
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krt_remove_route(net *net, rte *old)
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krt_remove_route(rte *old)
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{
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net *net = old->net;
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struct rtentry re;
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if (old && !krt_capable(net, old))
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if (!krt_capable(old) || old->attrs->source == RTS_INHERIT)
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{
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DBG("krt_remove_route(ignored %I/%d)\n", net->n.prefix, net->n.pxlen);
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return;
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@ -58,12 +59,13 @@ krt_remove_route(net *net, rte *old)
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}
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void
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krt_add_route(net *net, rte *new)
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krt_add_route(rte *new)
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{
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net *net = new->net;
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struct rtentry re;
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rta *a = new->attrs;
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if (!krt_capable(net, new))
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if (!krt_capable(new) || new->attrs->source == RTS_INHERIT)
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{
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DBG("krt_add_route(ignored %I/%d)\n", net->n.prefix, net->n.pxlen);
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return;
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@ -105,9 +107,9 @@ krt_set_notify(struct proto *x, net *net, rte *new, rte *old)
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if (x->state != PRS_UP)
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return;
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if (old)
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krt_remove_route(net, old);
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krt_remove_route(old);
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if (new)
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krt_add_route(net, new);
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krt_add_route(new);
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}
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void
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@ -117,3 +119,4 @@ krt_set_preconfig(struct krt_proto *x)
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die("krt set: missing socket");
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x->p.rt_notify = krt_set_notify;
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}
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@ -12,8 +12,8 @@
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struct krt_set_params {
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};
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void krt_remove_route(net *net, rte *old);
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void krt_add_route(net *net, rte *new);
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int krt_capable(net *net, rte *e);
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void krt_remove_route(rte *old);
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void krt_add_route(rte *new);
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int krt_capable(rte *e);
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#endif
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@ -14,8 +14,11 @@
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/* Flags stored in net->n.flags */
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#define KRF_CREATE 0 /* Not seen in kernel table */
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#define KRF_SEEN 1 /* Seen in kernel table during last scan */
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#define KRF_UPDATE 2 /* Need to update this entry */
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#define KRF_DELETE 3 /* Should be deleted */
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#define KRF_LEARN 4 /* We should learn this route */
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/* sync-rt.c */
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