Removes phantom protocol from the pipe design.

It seems that by adding one pipe-specific exception to route
announcement code and by adding one argument to rt_notify() callback i
could completely eliminate the need for the phantom protocol instance
and therefore make the code more straightforward. It will also fix some
minor bugs (like ignoring debug flag changes from the command line).

2 files changed, 25 insertions, 75 deletions

diff --git a/proto/pipe/pipe.c b/proto/pipe/pipe.c
index 879135d1..943d3a0e 100644
--- a/proto/pipe/pipe.c
+++ b/proto/pipe/pipe.c
@@ -31,9 +31,12 @@
 #include "pipe.h"
 
 static void
-pipe_send(struct pipe_proto *p, rtable *src_table, rtable *dest, net *n, rte *new, rte *old, ea_list *attrs)
+pipe_rt_notify(struct proto *P, rtable *src_table, net *n, rte *new, rte *old, ea_list *attrs)
 {
+  struct pipe_proto *p = (struct pipe_proto *) P;
+  rtable *dest = (src_table == P->table) ? p->peer : P->table; /* The other side of the pipe */
   struct proto *src;
+
   net *nn;
   rte *e;
   rta a;
@@ -85,30 +88,12 @@ pipe_send(struct pipe_proto *p, rtable *src_table, rtable *dest, net *n, rte *ne
   src_table->pipe_busy = 0;
 }
 
-static void
-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->p.table, p->peer, net, new, old, attrs);
-}
-
-static void
-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->peer, p->p.table, net, new, old, attrs);
-}
-
 static int
 pipe_import_control(struct proto *P, rte **ee, ea_list **ea UNUSED, struct linpool *p UNUSED)
 {
   struct proto *pp = (*ee)->sender;
 
-  if (pp == P || pp == &((struct pipe_proto *) P)->phantom->p)
+  if (pp == P)
     return -1;	/* Avoid local loops automatically */
   return 0;
 }
@@ -130,49 +115,16 @@ static int
 pipe_start(struct proto *P)
 {
   struct pipe_proto *p = (struct pipe_proto *) P;
-  struct pipe_proto *ph;
   struct announce_hook *a;
 
-  /*
-   *  Create a phantom protocol which will represent the remote
-   *  end of the pipe (we need to do this in order to get different
-   *  filters and announce functions and it unfortunately involves
-   *  a couple of magic trickery).
-   *
-   *  The phantom protocol is used ONLY in announce hooks and
-   *  therefore in do_rte_announce() function.
-   */
-  ph = mb_alloc(P->pool, sizeof(struct pipe_proto));
-  memcpy(ph, p, sizeof(struct pipe_proto));
-  p->phantom = ph;
-  ph->phantom = p;
-  ph->p.accept_ra_types = (p->mode == PIPE_OPAQUE) ? RA_OPTIMAL : RA_ANY;
-  ph->p.rt_notify = pipe_rt_notify_sec;
-  ph->p.proto_state = PS_UP;
-  ph->p.core_state = ph->p.core_goal = FS_HAPPY;
+  /* Clean up the secondary stats */
+  bzero(&p->peer_stats, sizeof(struct proto_stats));
 
-  /*
-   *  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;
+  /* Lock the peer table, unlock is handled in proto_fell_down() */
+  rt_lock_table(p->peer);
 
-  /*
-   *  Connect the phantom protocol to the peer routing table, but
-   *  keep it in the list of connections of the primary protocol,
-   *  so that it gets disconnected at the right time and we also
-   *  get all routes from both sides during the feeding phase.
-   */
+  /* Connect the protocol also to the peer routing table. */
   a = proto_add_announce_hook(P, p->peer);
-  a->proto = &ph->p;
 
   return PS_UP;
 }
@@ -187,9 +139,10 @@ pipe_init(struct proto_config *C)
   p->peer = c->peer->table;
   p->mode = c->mode;
   P->accept_ra_types = (p->mode == PIPE_OPAQUE) ? RA_OPTIMAL : RA_ANY;
-  P->rt_notify = pipe_rt_notify_pri;
+  P->rt_notify = pipe_rt_notify;
   P->import_control = pipe_import_control;
   P->reload_routes = pipe_reload_routes;
+
   return P;
 }
 
@@ -222,24 +175,9 @@ pipe_reconfigure(struct proto *P, struct proto_config *new)
   if ((o->peer->table != n->peer->table) || (o->mode != n->mode))
     return 0;
 
-  /* Update also the filter in the phantom protocol */
-  p->phantom->p.out_filter = new->in_filter;
   return 1;
 }
 
-struct rtable *
-pipe_get_peer_table(struct proto *P)
-{
-  struct pipe_proto *p = (struct pipe_proto *) P;
-  return p->peer;
-}
-
-struct proto_stats *
-pipe_get_peer_stats(struct proto *P)
-{
-  struct pipe_proto *p = (struct pipe_proto *) P;
-  return &p->phantom->p.stats;
-}
 
 struct protocol proto_pipe = {
   name:		"Pipe",
diff --git a/proto/pipe/pipe.h b/proto/pipe/pipe.h
index 368ba41b..fbd21291 100644
--- a/proto/pipe/pipe.h
+++ b/proto/pipe/pipe.h
@@ -21,8 +21,20 @@ struct pipe_config {
 struct pipe_proto {
   struct proto p;
   struct rtable *peer;
+  struct proto_stats peer_stats;	/* Statistics for the direction peer->primary */
   int mode;				/* PIPE_OPAQUE or PIPE_TRANSPARENT */
-  struct pipe_proto *phantom;
 };
 
+
+extern struct protocol proto_pipe;
+
+static inline int proto_is_pipe(struct proto *p)
+{ return p->proto == &proto_pipe; }
+
+static inline struct rtable * pipe_get_peer_table(struct proto *P)
+{ return ((struct pipe_proto *) P)->peer; }
+
+static inline struct proto_stats * pipe_get_peer_stats(struct proto *P)
+{ return &((struct pipe_proto *) P)->peer_stats; }
+
 #endif