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Rewritten kernel syncer. Now uses the rta trickery I've introduced yesterday

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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 1998-12-08 16:20:13 +00:00
parent 04925e9040
commit f39e4713c2
4 changed files with 136 additions and 90 deletions
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200
sysdep/linux/krt-scan.c
View file

@ -28,54 +28,39 @@ static int krt_scan_fd = -1;
/* FIXME: Filtering */
static void
krt_magic_route(struct krt_proto *p, net *net, ip_addr gw)
static int
krt_uptodate(rte *k, rte *e)
{
neighbor *ng;
rta a, *t;
rte *e;
rta *ka = k->attrs, *ea = e->attrs;
ng = neigh_find(&p->p, &gw, 0);
if (!ng)
{
log(L_ERR "Kernel told us to use non-neighbor %I for %I/%d\n", gw, net->n.prefix, net->n.pxlen);
return;
}
a.proto = &p->p;
a.source = RTS_INHERIT;
a.scope = SCOPE_UNIVERSE;
a.cast = RTC_UNICAST;
a.dest = RTD_ROUTER;
a.tos = 0;
a.flags = 0;
a.gw = gw;
a.from = IPA_NONE;
a.iface = ng->iface;
a.attrs = NULL;
t = rta_lookup(&a);
e = rte_get_temp(t);
e->net = net;
rte_update(net, &p->p, e);
if (ka->dest != ea->dest)
return 0;
if (ka->dest == RTD_ROUTER && !ipa_equal(ka->gw, ea->gw))
return 0;
/* FIXME: Device routes */
return 1;
}
static void
krt_parse_entry(byte *e, struct krt_proto *p)
krt_parse_entry(byte *ent, struct krt_proto *p)
{
u32 dest0, gw0, mask0;
ip_addr dest, gw, mask;
unsigned int flags;
unsigned int flags, verdict;
int masklen;
net *net;
byte *iface = e;
byte *iface = ent;
rta a;
rte *e, *old;
if (sscanf(e, "%*s\t%x\t%x\t%x\t%*d\t%*d\t%*d\t%x\t", &dest0, &gw0, &flags, &mask0) != 4)
if (sscanf(ent, "%*s\t%x\t%x\t%x\t%*d\t%*d\t%*d\t%x\t", &dest0, &gw0, &flags, &mask0) != 4)
{
log(L_ERR "krt read: unable to parse `%s'", e);
log(L_ERR "krt read: unable to parse `%s'", ent);
return;
}
while (*e != '\t')
e++;
*e = 0;
while (*ent != '\t')
ent++;
*ent = 0;
dest = ipa_from_u32(dest0);
ipa_ntoh(dest);
@ -99,47 +84,69 @@ krt_parse_entry(byte *e, struct krt_proto *p)
log(L_WARN "krt: Ignoring redirect to %I/%d via %I", dest, masklen, gw);
return;
}
net = net_get(&master_table, 0, dest, masklen);
if (net->routes)
a.proto = &p->p;
a.source = RTS_INHERIT;
a.scope = SCOPE_UNIVERSE;
a.cast = RTC_UNICAST;
a.tos = a.flags = a.aflags = 0;
a.from = IPA_NONE;
a.iface = NULL;
a.attrs = NULL;
if (flags & RTF_GATEWAY)
{
rte *e = net->routes;
rta *a = e->attrs;
int ok;
switch (a->dest)
{
case RTD_ROUTER:
ok = (flags & RTF_GATEWAY) && ipa_equal(gw, a->gw);
break;
case RTD_DEVICE:
#ifdef CONFIG_AUTO_ROUTES
ok = 1;
/* FIXME: What about static interface routes? */
#else
ok = !(flags & RTF_GATEWAY) && !strcmp(iface, a->iface->name);
#endif
break;
case RTD_UNREACHABLE:
ok = flags & RTF_REJECT;
break;
default:
ok = 0;
}
net->n.flags |= ok ? KRF_SEEN : KRF_UPDATE;
neighbor *ng = neigh_find(&p->p, &gw, 0);
if (ng)
a.iface = ng->iface;
else
/* FIXME: Remove this warning? */
log(L_WARN "Kernel told us to use non-neighbor %I for %I/%d\n", gw, net->n.prefix, net->n.pxlen);
a.dest = RTD_ROUTER;
a.gw = gw;
}
else if (flags & RTF_REJECT)
{
a.dest = RTD_UNREACHABLE;
a.gw = IPA_NONE;
}
else
{
#ifdef CONFIG_AUTO_ROUTES
if (!(flags & RTF_GATEWAY)) /* It's a device route */
return;
#endif
DBG("krt_parse_entry: kernel reporting unknown route %I/%d\n", dest, masklen);
if (p->scanopt.learn)
{
if (flags & RTF_GATEWAY)
krt_magic_route(p, net, gw);
}
net->n.flags |= KRF_UPDATE;
/* FIXME: Should support interface routes? */
/* FIXME: What about systems not generating their own if routes? (see CONFIG_AUTO_ROUTES) */
return;
}
e = rte_get_temp(&a);
e->net = net;
old = net->routes;
if (old && !krt_capable(old))
old = NULL;
if (old)
{
if (krt_uptodate(e, net->routes))
verdict = KRF_SEEN;
else
verdict = KRF_UPDATE;
}
else if (p->scanopt.learn && !net->routes)
verdict = KRF_LEARN;
else
verdict = KRF_DELETE;
DBG("krt_parse_entry: verdict %d\n", verdict);
net->n.flags = verdict;
if (verdict != KRF_SEEN)
{
/* Get a cached copy of attributes and link the route */
e->attrs = rta_lookup(e->attrs);
e->next = net->routes;
net->routes = e;
}
else
rte_free(e);
}
static int
@ -187,7 +194,7 @@ krt_scan_proc(struct krt_proto *p)
}
static void
krt_prune(void)
krt_prune(struct krt_proto *p)
{
struct rtable *t = &master_table;
struct fib_node *f;
@ -200,24 +207,57 @@ krt_prune(void)
FIB_WALK(&t->fib, f)
{
net *n = (net *) f;
switch (f->flags)
int verdict = f->flags;
rte *new, *old;
if (verdict != KRF_CREATE && verdict != KRF_SEEN)
{
case KRF_UPDATE:
DBG("krt_prune: removing %I/%d\n", n->n.prefix, n->n.pxlen);
krt_remove_route(n, NULL);
/* Fall-thru */
case 0:
if (n->routes)
old = n->routes;
n->routes = old->next;
}
else
old = NULL;
new = n->routes;
switch (verdict)
{
case KRF_CREATE:
if (new)
{
DBG("krt_prune: reinstalling %I/%d\n", n->n.prefix, n->n.pxlen);
krt_add_route(n, n->routes);
if (new->attrs->source == RTS_INHERIT)
{
DBG("krt_prune: removing inherited %I/%d\n", n->n.prefix, n->n.pxlen);
rte_update(n, &p->p, NULL);
}
else
{
DBG("krt_prune: reinstalling %I/%d\n", n->n.prefix, n->n.pxlen);
krt_add_route(new);
}
}
break;
case KRF_SEEN:
/* Nothing happens */
break;
case KRF_UPDATE:
DBG("krt_prune: updating %I/%d\n", n->n.prefix, n->n.pxlen);
krt_remove_route(old);
krt_add_route(new);
break;
case KRF_DELETE:
DBG("krt_prune: deleting %I/%d\n", n->n.prefix, n->n.pxlen);
krt_remove_route(old);
break;
case KRF_LEARN:
DBG("krt_prune: learning %I/%d\n", n->n.prefix, n->n.pxlen);
rte_update(n, &p->p, new);
break;
default:
die("krt_prune: invalid route status");
}
if (old)
rte_free(old);
f->flags = 0;
}
FIB_WALK_END;
@ -229,7 +269,7 @@ krt_scan_fire(timer *t)
struct krt_proto *p = t->data;
if (krt_scan_proc(p))
krt_prune();
krt_prune(p);
}
void

17
sysdep/unix/krt-set.c
View file

@ -22,7 +22,7 @@
#include "lib/krt.h"
int
krt_capable(net *net, rte *e)
krt_capable(rte *e)
{
rta *a = e->attrs;
@ -40,11 +40,12 @@ krt_capable(net *net, rte *e)
}
void
krt_remove_route(net *net, rte *old)
krt_remove_route(rte *old)
{
net *net = old->net;
struct rtentry re;
if (old && !krt_capable(net, old))
if (!krt_capable(old) || old->attrs->source == RTS_INHERIT)
{
DBG("krt_remove_route(ignored %I/%d)\n", net->n.prefix, net->n.pxlen);
return;
@ -58,12 +59,13 @@ krt_remove_route(net *net, rte *old)
}
void
krt_add_route(net *net, rte *new)
krt_add_route(rte *new)
{
net *net = new->net;
struct rtentry re;
rta *a = new->attrs;
if (!krt_capable(net, new))
if (!krt_capable(new) || new->attrs->source == RTS_INHERIT)
{
DBG("krt_add_route(ignored %I/%d)\n", net->n.prefix, net->n.pxlen);
return;
@ -105,9 +107,9 @@ krt_set_notify(struct proto *x, net *net, rte *new, rte *old)
if (x->state != PRS_UP)
return;
if (old)
krt_remove_route(net, old);
krt_remove_route(old);
if (new)
krt_add_route(net, new);
krt_add_route(new);
}
void
@ -117,3 +119,4 @@ krt_set_preconfig(struct krt_proto *x)
die("krt set: missing socket");
x->p.rt_notify = krt_set_notify;
}

6
sysdep/unix/krt-set.h
View file

@ -12,8 +12,8 @@
struct krt_set_params {
};
void krt_remove_route(net *net, rte *old);
void krt_add_route(net *net, rte *new);
int krt_capable(net *net, rte *e);
void krt_remove_route(rte *old);
void krt_add_route(rte *new);
int krt_capable(rte *e);
#endif

3
sysdep/unix/krt.h
View file

@ -14,8 +14,11 @@
/* Flags stored in net->n.flags */
#define KRF_CREATE 0 /* Not seen in kernel table */
#define KRF_SEEN 1 /* Seen in kernel table during last scan */
#define KRF_UPDATE 2 /* Need to update this entry */
#define KRF_DELETE 3 /* Should be deleted */
#define KRF_LEARN 4 /* We should learn this route */
/* sync-rt.c */