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iof-bird-daemon / proto / pipe / pipe.c @ fe9f1a6d

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/*
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 *        BIRD -- Table-to-Table Routing Protocol a.k.a Pipe
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 *
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 *        (c) 1999--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: Pipe
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 *
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 * The Pipe protocol is very simple. It just connects to two routing tables
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 * using proto_add_announce_hook() and whenever it receives a rt_notify()
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 * about a change in one of the tables, it converts it to a rte_update()
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 * in the other one.
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 *
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 * To avoid pipe loops, Pipe keeps a `being updated' flag in each routing
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 * table.
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 *
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 * A pipe has two announce hooks, the first connected to the main
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 * table, the second connected to the peer table. When a new route is
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 * announced on the main table, it gets checked by an export filter in
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 * ahook 1, and, after that, it is announced to the peer table via
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 * rte_update(), an import filter in ahook 2 is called. When a new
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 * route is announced in the peer table, an export filter in ahook2
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 * and an import filter in ahook 1 are used. Oviously, there is no
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 * need in filtering the same route twice, so both import filters are
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 * set to accept, while user configured 'import' and 'export' filters
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 * are used as export filters in ahooks 2 and 1. Route limits are
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 * handled similarly, but on the import side of ahooks.
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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/cli.h"
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#include "conf/conf.h"
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#include "filter/filter.h"
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#include "lib/string.h"
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#include "pipe.h"
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static void
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pipe_rt_notify(struct proto *P, rtable *src_table, net *n, rte *new, rte *old, ea_list *attrs)
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{
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  struct pipe_proto *p = (struct pipe_proto *) P;
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  struct announce_hook *ah = (src_table == P->table) ? p->peer_ahook : P->main_ahook;
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  rtable *dst_table = ah->table;
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  struct rte_src *src;
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  net *nn;
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  rte *e;
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  rta a;
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  if (!new && !old)
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    return;
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  if (dst_table->pipe_busy)
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    {
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      log(L_ERR "Pipe loop detected when sending %N to table %s",
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          n->n.addr, dst_table->name);
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      return;
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    }
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  nn = net_get(dst_table, n->n.addr);
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  if (new)
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    {
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      memcpy(&a, new->attrs, sizeof(rta));
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      if (p->mode == PIPE_OPAQUE)
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        {
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          a.src = P->main_source;
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          a.source = RTS_PIPE;
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        }
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      a.aflags = 0;
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      a.eattrs = attrs;
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      a.hostentry = NULL;
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      e = rte_get_temp(&a);
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      e->net = nn;
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      e->pflags = 0;
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      if (p->mode == PIPE_TRANSPARENT)
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        {
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          /* Copy protocol specific embedded attributes. */
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          memcpy(&(e->u), &(new->u), sizeof(e->u));
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          e->pref = new->pref;
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          e->pflags = new->pflags;
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        }
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      src = a.src;
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    }
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  else
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    {
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      e = NULL;
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      src = old->attrs->src;
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    }
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  src_table->pipe_busy = 1;
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  rte_update2(ah, nn, e, src);
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  src_table->pipe_busy = 0;
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}
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static int
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pipe_import_control(struct proto *P, rte **ee, ea_list **ea UNUSED, struct linpool *p UNUSED)
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{
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  struct proto *pp = (*ee)->sender->proto;
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  if (pp == P)
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    return -1;        /* Avoid local loops automatically */
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  return 0;
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}
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static int
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pipe_reload_routes(struct proto *P)
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{
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  struct pipe_proto *p = (struct pipe_proto *) P;
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  /*
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   * Because the pipe protocol feeds routes from both routing tables
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   * together, both directions are reloaded during refeed and 'reload
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   * out' command works like 'reload' command. For symmetry, we also
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   * request refeed when 'reload in' command is used.
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   */
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  proto_request_feeding(P);
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  proto_reset_limit(P->main_ahook->in_limit);
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  proto_reset_limit(p->peer_ahook->in_limit);
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  return 1;
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}
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static struct proto *
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pipe_init(struct proto_config *C)
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{
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  struct pipe_config *c = (struct pipe_config *) C;
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  struct proto *P = proto_new(C, sizeof(struct pipe_proto));
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  struct pipe_proto *p = (struct pipe_proto *) P;
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  p->mode = c->mode;
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  p->peer_table = c->peer->table;
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  P->accept_ra_types = (p->mode == PIPE_OPAQUE) ? RA_OPTIMAL : RA_ANY;
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  P->rt_notify = pipe_rt_notify;
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  P->import_control = pipe_import_control;
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  P->reload_routes = pipe_reload_routes;
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  return P;
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}
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static int
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pipe_start(struct proto *P)
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{
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  struct pipe_config *cf = (struct pipe_config *) P->cf;
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  struct pipe_proto *p = (struct pipe_proto *) P;
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  /* Lock both tables, unlock is handled in pipe_cleanup() */
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  rt_lock_table(P->table);
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  rt_lock_table(p->peer_table);
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  /* Going directly to PS_UP - prepare for feeding,
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     connect the protocol to both routing tables */
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  P->main_ahook = proto_add_announce_hook(P, P->table, &P->stats);
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  P->main_ahook->out_filter = cf->c.out_filter;
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  P->main_ahook->in_limit = cf->c.in_limit;
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  proto_reset_limit(P->main_ahook->in_limit);
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  p->peer_ahook = proto_add_announce_hook(P, p->peer_table, &p->peer_stats);
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  p->peer_ahook->out_filter = cf->c.in_filter;
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  p->peer_ahook->in_limit = cf->c.out_limit;
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  proto_reset_limit(p->peer_ahook->in_limit);
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  if (p->mode == PIPE_OPAQUE)
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    {
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      P->main_source = rt_get_source(P, 0);
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      rt_lock_source(P->main_source);
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    }
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  return PS_UP;
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}
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static void
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pipe_cleanup(struct proto *P)
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{
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  struct pipe_proto *p = (struct pipe_proto *) P;
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  bzero(&P->stats, sizeof(struct proto_stats));
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  bzero(&p->peer_stats, sizeof(struct proto_stats));
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  P->main_ahook = NULL;
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  p->peer_ahook = NULL;
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  if (p->mode == PIPE_OPAQUE)
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    rt_unlock_source(P->main_source);
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  P->main_source = NULL;
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  rt_unlock_table(P->table);
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  rt_unlock_table(p->peer_table);
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}
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static void
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pipe_postconfig(struct proto_config *C)
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{
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  struct pipe_config *c = (struct pipe_config *) C;
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  if (!c->peer)
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    cf_error("Name of peer routing table not specified");
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  if (c->peer == C->table)
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    cf_error("Primary table and peer table must be different");
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  if (C->in_keep_filtered)
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    cf_error("Pipe protocol prohibits keeping filtered routes");
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  if (C->rx_limit)
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    cf_error("Pipe protocol does not support receive limits");
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}
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extern int proto_reconfig_type;
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static int
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pipe_reconfigure(struct proto *P, struct proto_config *new)
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{
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  struct pipe_proto *p = (struct pipe_proto *)P;
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  struct proto_config *old = P->cf;
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  struct pipe_config *oc = (struct pipe_config *) old;
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  struct pipe_config *nc = (struct pipe_config *) new;
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  if ((oc->peer->table != nc->peer->table) || (oc->mode != nc->mode))
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    return 0;
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  /* Update output filters in ahooks */
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  if (P->main_ahook)
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    {
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      P->main_ahook->out_filter = new->out_filter;
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      P->main_ahook->in_limit = new->in_limit;
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      proto_verify_limits(P->main_ahook);
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    }
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  if (p->peer_ahook)
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    {
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      p->peer_ahook->out_filter = new->in_filter;
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      p->peer_ahook->in_limit = new->out_limit;
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      proto_verify_limits(p->peer_ahook);
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    }
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  if ((P->proto_state != PS_UP) || (proto_reconfig_type == RECONFIG_SOFT))
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    return 1;
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  if ((new->preference != old->preference)
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      || ! filter_same(new->in_filter, old->in_filter)
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      || ! filter_same(new->out_filter, old->out_filter))
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    proto_request_feeding(P);
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  return 1;
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}
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static void
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pipe_copy_config(struct proto_config *dest, struct proto_config *src)
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{
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  /* Just a shallow copy, not many items here */
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  proto_copy_rest(dest, src, sizeof(struct pipe_config));
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}
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static void
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pipe_get_status(struct proto *P, byte *buf)
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{
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  struct pipe_proto *p = (struct pipe_proto *) P;
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  bsprintf(buf, "%c> %s", (p->mode == PIPE_OPAQUE) ? '-' : '=', p->peer_table->name);
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}
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static void
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pipe_show_stats(struct pipe_proto *p)
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{
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  struct proto_stats *s1 = &p->p.stats;
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  struct proto_stats *s2 = &p->peer_stats;
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  /*
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   * Pipe stats (as anything related to pipes) are a bit tricky. There
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   * are two sets of stats - s1 for ahook to the primary routing and
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   * s2 for the ahook to the secondary routing table. The user point
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   * of view is that routes going from the primary routing table to
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   * the secondary routing table are 'exported', while routes going in
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   * the other direction are 'imported'.
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   *
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   * Each route going through a pipe is, technically, first exported
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   * to the pipe and then imported from that pipe and such operations
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   * are counted in one set of stats according to the direction of the
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   * route propagation. Filtering is done just in the first part
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   * (export). Therefore, we compose stats for one directon for one
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   * user direction from both import and export stats, skipping
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   * immediate and irrelevant steps (exp_updates_accepted,
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   * imp_updates_received, imp_updates_filtered, ...).
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   *
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   * Rule of thumb is that stats s1 have the correct 'polarity'
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   * (imp/exp), while stats s2 have switched 'polarity'.
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   */
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  cli_msg(-1006, "  Routes:         %u imported, %u exported",
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          s1->imp_routes, s2->imp_routes);
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  cli_msg(-1006, "  Route change stats:     received   rejected   filtered    ignored   accepted");
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  cli_msg(-1006, "    Import updates:     %10u %10u %10u %10u %10u",
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          s2->exp_updates_received, s2->exp_updates_rejected + s1->imp_updates_invalid,
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          s2->exp_updates_filtered, s1->imp_updates_ignored, s1->imp_updates_accepted);
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  cli_msg(-1006, "    Import withdraws:   %10u %10u        --- %10u %10u",
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          s2->exp_withdraws_received, s1->imp_withdraws_invalid,
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          s1->imp_withdraws_ignored, s1->imp_withdraws_accepted);
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  cli_msg(-1006, "    Export updates:     %10u %10u %10u %10u %10u",
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          s1->exp_updates_received, s1->exp_updates_rejected + s2->imp_updates_invalid,
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          s1->exp_updates_filtered, s2->imp_updates_ignored, s2->imp_updates_accepted);
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  cli_msg(-1006, "    Export withdraws:   %10u %10u        --- %10u %10u",
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          s1->exp_withdraws_received, s2->imp_withdraws_invalid,
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          s2->imp_withdraws_ignored, s2->imp_withdraws_accepted);
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}
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static void
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pipe_show_proto_info(struct proto *P)
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{
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  struct pipe_proto *p = (struct pipe_proto *) P;
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  struct pipe_config *cf = (struct pipe_config *) P->cf;
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  // cli_msg(-1006, "  Table:          %s", P->table->name);
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  // cli_msg(-1006, "  Peer table:     %s", p->peer_table->name);
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  cli_msg(-1006, "  Preference:     %d", P->preference);
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  cli_msg(-1006, "  Input filter:   %s", filter_name(cf->c.in_filter));
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  cli_msg(-1006, "  Output filter:  %s", filter_name(cf->c.out_filter));
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  proto_show_limit(cf->c.in_limit, "Import limit:");
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  proto_show_limit(cf->c.out_limit, "Export limit:");
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  if (P->proto_state != PS_DOWN)
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    pipe_show_stats(p);
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}
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struct protocol proto_pipe = {
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  .name =                "Pipe",
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  .template =                "pipe%d",
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  .multitable =                1,
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  .preference =                DEF_PREF_PIPE,
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  .config_size =        sizeof(struct pipe_config),
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  .postconfig =                pipe_postconfig,
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  .init =                pipe_init,
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  .start =                pipe_start,
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  .cleanup =                pipe_cleanup,
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  .reconfigure =        pipe_reconfigure,
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  .copy_config =         pipe_copy_config,
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  .get_status =         pipe_get_status,
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  .show_proto_info =         pipe_show_proto_info
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};