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Fixes some problems in pipes.

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For transparent pipes, loop detection works correctly now.
Pipes are now more symmetric - in both directions filtering
is done in do_rte_announce().
This commit is contained in:
Ondrej Zajicek 2009-12-02 17:26:16 +01:00
parent e8b29bdc8d
commit 11787b8473
2 changed files with 44 additions and 10 deletions
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29
nest/rt-table.c
View File

@ -403,6 +403,26 @@ rte_recalculate(rtable *table, net *net, struct proto *p, struct proto *src, rte
{
if (old->attrs->proto == src)
{
/* If there is the same route in the routing table but from
* a different sender, then there are two paths from the
* source protocol to this routing table through transparent
* pipes, which is not allowed.
*
* We log that and ignore the route. If it is withdraw, we
* ignore it completely (there might be 'spurious withdraws',
* see FIXME in do_rte_announce())
*/
if (old->sender != p)
{
if (new)
{
log(L_ERR "Pipe collision detected when sending %I/%d to table %s",
net->n.prefix, net->n.pxlen, table->name);
rte_free_quick(new);
}
return;
}
if (new && rte_same(old, new))
{
/* No changes, ignore the new route */
@ -597,11 +617,12 @@ rte_update(rtable *table, net *net, struct proto *p, struct proto *src, rte *new
new->sender = p;
struct filter *filter = p->in_filter;
/* Do not filter routes going to the secondary side of the pipe,
that should only go through export filter.
FIXME Make a better check whether p is really a pipe. */
if (p->table != table)
/* Do not filter routes going through the pipe,
they are filtered in the export filter only. */
#ifdef CONFIG_PIPE
if (p->proto == &proto_pipe)
filter = FILTER_ACCEPT;
#endif
p->stats.imp_updates_received++;
if (!rte_validate(new))

25
proto/pipe/pipe.c
View File

@ -31,7 +31,7 @@
#include "pipe.h"
static void
pipe_send(struct pipe_proto *p, rtable *dest, net *n, rte *new, rte *old, ea_list *attrs)
pipe_send(struct pipe_proto *p, rtable *src_table, rtable *dest, net *n, rte *new, rte *old, ea_list *attrs)
{
struct proto *src;
net *nn;
@ -80,9 +80,9 @@ pipe_send(struct pipe_proto *p, rtable *dest, net *n, rte *new, rte *old, ea_lis
src = old->attrs->proto;
}
dest->pipe_busy = 1;
src_table->pipe_busy = 1;
rte_update(dest, nn, &p->p, (p->mode == PIPE_OPAQUE) ? &p->p : src, e);
dest->pipe_busy = 0;
src_table->pipe_busy = 0;
}
static void
@ -91,7 +91,7 @@ pipe_rt_notify_pri(struct proto *P, net *net, rte *new, rte *old, ea_list *attrs
struct pipe_proto *p = (struct pipe_proto *) P;
DBG("PIPE %c> %I/%d\n", (new ? '+' : '-'), net->n.prefix, net->n.pxlen);
pipe_send(p, p->peer, net, new, old, attrs);
pipe_send(p, p->p.table, p->peer, net, new, old, attrs);
}
static void
@ -100,7 +100,7 @@ pipe_rt_notify_sec(struct proto *P, net *net, rte *new, rte *old, ea_list *attrs
struct pipe_proto *p = ((struct pipe_proto *) P)->phantom;
DBG("PIPE %c< %I/%d\n", (new ? '+' : '-'), net->n.prefix, net->n.pxlen);
pipe_send(p, p->p.table, net, new, old, attrs);
pipe_send(p, p->peer, p->p.table, net, new, old, attrs);
}
static int
@ -134,7 +134,20 @@ pipe_start(struct proto *P)
ph->p.rt_notify = pipe_rt_notify_sec;
ph->p.proto_state = PS_UP;
ph->p.core_state = ph->p.core_goal = FS_HAPPY;
ph->p.in_filter = ph->p.out_filter = FILTER_ACCEPT; /* We do all filtering on the local end */
/*
* Routes should be filtered in the do_rte_announce() (export
* filter for protocols). Reverse direction is handled by putting
* specified import filter to out_filter field of the phantom
* protocol.
*
* in_filter fields are not important, there is an exception in
* rte_update() to ignore it for pipes. We cannot just set
* P->in_filter to FILTER_ACCEPT, because that would break other
* things (reconfiguration, show-protocols command).
*/
ph->p.in_filter = FILTER_ACCEPT;
ph->p.out_filter = P->in_filter;
/*
* Connect the phantom protocol to the peer routing table, but