mirror of
https://gitlab.nic.cz/labs/bird.git
synced 2024-12-23 02:01:55 +00:00
312 lines
8.8 KiB
C
312 lines
8.8 KiB
C
/*
|
|
* BIRD -- Table-to-Table Routing Protocol a.k.a Pipe
|
|
*
|
|
* (c) 1999--2000 Martin Mares <mj@ucw.cz>
|
|
*
|
|
* Can be freely distributed and used under the terms of the GNU GPL.
|
|
*/
|
|
|
|
/**
|
|
* DOC: Pipe
|
|
*
|
|
* The Pipe protocol is very simple. It just connects to two routing tables
|
|
* using proto_add_announce_hook() and whenever it receives a rt_notify()
|
|
* about a change in one of the tables, it converts it to a rte_update()
|
|
* in the other one.
|
|
*
|
|
* To avoid pipe loops, Pipe keeps a `being updated' flag in each routing
|
|
* table.
|
|
*
|
|
* A pipe has two announce hooks, the first connected to the main
|
|
* table, the second connected to the peer table. When a new route is
|
|
* announced on the main table, it gets checked by an export filter in
|
|
* ahook 1, and, after that, it is announced to the peer table via
|
|
* rte_update(), an import filter in ahook 2 is called. When a new
|
|
* route is announced in the peer table, an export filter in ahook2
|
|
* and an import filter in ahook 1 are used. Oviously, there is no
|
|
* need in filtering the same route twice, so both import filters are
|
|
* set to accept, while user configured 'import' and 'export' filters
|
|
* are used as export filters in ahooks 2 and 1. Route limits are
|
|
* handled similarly, but on the import side of ahooks.
|
|
*/
|
|
|
|
#undef LOCAL_DEBUG
|
|
|
|
#include "nest/bird.h"
|
|
#include "nest/iface.h"
|
|
#include "nest/protocol.h"
|
|
#include "nest/rt.h"
|
|
#include "nest/cli.h"
|
|
#include "conf/conf.h"
|
|
#include "filter/filter.h"
|
|
#include "lib/string.h"
|
|
|
|
#include "pipe.h"
|
|
|
|
#ifdef CONFIG_BGP
|
|
#include "proto/bgp/bgp.h"
|
|
#endif
|
|
|
|
static void
|
|
pipe_rt_notify(struct proto *P, struct channel *src_ch, net *n, rte *new, rte *old)
|
|
{
|
|
struct pipe_proto *p = (void *) P;
|
|
struct channel *dst = (src_ch == p->pri) ? p->sec : p->pri;
|
|
struct rte_src *src;
|
|
|
|
rte *e;
|
|
rta *a;
|
|
|
|
if (!new && !old)
|
|
return;
|
|
|
|
if (dst->table->pipe_busy)
|
|
{
|
|
log(L_ERR "Pipe loop detected when sending %N to table %s",
|
|
n->n.addr, dst->table->name);
|
|
return;
|
|
}
|
|
|
|
if (new)
|
|
{
|
|
src = new->src;
|
|
|
|
a = alloca(rta_size(new->attrs));
|
|
memcpy(a, new->attrs, rta_size(new->attrs));
|
|
|
|
a->cached = 0;
|
|
a->hostentry = NULL;
|
|
e = rte_get_temp(a, src);
|
|
e->pflags = new->pflags;
|
|
|
|
#ifdef CONFIG_BGP
|
|
/* Hack to cleanup cached value */
|
|
if (e->src->proto->proto == &proto_bgp)
|
|
e->pflags &= ~(BGP_REF_STALE | BGP_REF_NOT_STALE);
|
|
#endif
|
|
}
|
|
else
|
|
{
|
|
e = NULL;
|
|
src = old->src;
|
|
}
|
|
|
|
src_ch->table->pipe_busy = 1;
|
|
rte_update2(dst, n->n.addr, e, src);
|
|
src_ch->table->pipe_busy = 0;
|
|
}
|
|
|
|
static int
|
|
pipe_preexport(struct proto *P, rte *e)
|
|
{
|
|
struct proto *pp = e->sender->proto;
|
|
|
|
if (pp == P)
|
|
return -1; /* Avoid local loops automatically */
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
pipe_reload_routes(struct channel *C)
|
|
{
|
|
struct pipe_proto *p = (void *) C->proto;
|
|
|
|
/* Route reload on one channel is just refeed on the other */
|
|
channel_request_feeding((C == p->pri) ? p->sec : p->pri);
|
|
}
|
|
|
|
|
|
static void
|
|
pipe_postconfig(struct proto_config *CF)
|
|
{
|
|
struct pipe_config *cf = (void *) CF;
|
|
struct channel_config *cc = proto_cf_main_channel(CF);
|
|
|
|
if (!cc->table)
|
|
cf_error("Primary routing table not specified");
|
|
|
|
if (!cf->peer)
|
|
cf_error("Secondary routing table not specified");
|
|
|
|
if (cc->table == cf->peer)
|
|
cf_error("Primary table and peer table must be different");
|
|
|
|
if (cc->table->addr_type != cf->peer->addr_type)
|
|
cf_error("Primary table and peer table must have the same type");
|
|
|
|
if (cc->rx_limit.action)
|
|
cf_error("Pipe protocol does not support receive limits");
|
|
|
|
if (cc->in_keep_filtered)
|
|
cf_error("Pipe protocol prohibits keeping filtered routes");
|
|
|
|
cc->debug = cf->c.debug;
|
|
}
|
|
|
|
static int
|
|
pipe_configure_channels(struct pipe_proto *p, struct pipe_config *cf)
|
|
{
|
|
struct channel_config *cc = proto_cf_main_channel(&cf->c);
|
|
|
|
struct channel_config pri_cf = {
|
|
.name = "pri",
|
|
.channel = cc->channel,
|
|
.table = cc->table,
|
|
.out_filter = cc->out_filter,
|
|
.in_limit = cc->in_limit,
|
|
.ra_mode = RA_ANY,
|
|
.debug = cc->debug,
|
|
.rpki_reload = cc->rpki_reload,
|
|
};
|
|
|
|
struct channel_config sec_cf = {
|
|
.name = "sec",
|
|
.channel = cc->channel,
|
|
.table = cf->peer,
|
|
.out_filter = cc->in_filter,
|
|
.in_limit = cc->out_limit,
|
|
.ra_mode = RA_ANY,
|
|
.debug = cc->debug,
|
|
.rpki_reload = cc->rpki_reload,
|
|
};
|
|
|
|
return
|
|
proto_configure_channel(&p->p, &p->pri, &pri_cf) &&
|
|
proto_configure_channel(&p->p, &p->sec, &sec_cf);
|
|
}
|
|
|
|
static struct proto *
|
|
pipe_init(struct proto_config *CF)
|
|
{
|
|
struct proto *P = proto_new(CF);
|
|
struct pipe_proto *p = (void *) P;
|
|
struct pipe_config *cf = (void *) CF;
|
|
|
|
P->rt_notify = pipe_rt_notify;
|
|
P->preexport = pipe_preexport;
|
|
P->reload_routes = pipe_reload_routes;
|
|
|
|
pipe_configure_channels(p, cf);
|
|
|
|
return P;
|
|
}
|
|
|
|
static int
|
|
pipe_reconfigure(struct proto *P, struct proto_config *CF)
|
|
{
|
|
struct pipe_proto *p = (void *) P;
|
|
struct pipe_config *cf = (void *) CF;
|
|
|
|
return pipe_configure_channels(p, cf);
|
|
}
|
|
|
|
static void
|
|
pipe_copy_config(struct proto_config *dest UNUSED, struct proto_config *src UNUSED)
|
|
{
|
|
/* Just a shallow copy, not many items here */
|
|
}
|
|
|
|
static void
|
|
pipe_get_status(struct proto *P, byte *buf)
|
|
{
|
|
struct pipe_proto *p = (void *) P;
|
|
|
|
bsprintf(buf, "%s <=> %s", p->pri->table->name, p->sec->table->name);
|
|
}
|
|
|
|
static void
|
|
pipe_show_stats(struct pipe_proto *p)
|
|
{
|
|
struct proto_stats *s1 = &p->pri->stats;
|
|
struct proto_stats *s2 = &p->sec->stats;
|
|
|
|
/*
|
|
* Pipe stats (as anything related to pipes) are a bit tricky. There
|
|
* are two sets of stats - s1 for ahook to the primary routing and
|
|
* s2 for the ahook to the secondary routing table. The user point
|
|
* of view is that routes going from the primary routing table to
|
|
* the secondary routing table are 'exported', while routes going in
|
|
* the other direction are 'imported'.
|
|
*
|
|
* Each route going through a pipe is, technically, first exported
|
|
* to the pipe and then imported from that pipe and such operations
|
|
* are counted in one set of stats according to the direction of the
|
|
* route propagation. Filtering is done just in the first part
|
|
* (export). Therefore, we compose stats for one directon for one
|
|
* user direction from both import and export stats, skipping
|
|
* immediate and irrelevant steps (exp_updates_accepted,
|
|
* imp_updates_received, imp_updates_filtered, ...).
|
|
*
|
|
* Rule of thumb is that stats s1 have the correct 'polarity'
|
|
* (imp/exp), while stats s2 have switched 'polarity'.
|
|
*/
|
|
|
|
cli_msg(-1006, " Routes: %u imported, %u exported",
|
|
s1->imp_routes, s2->imp_routes);
|
|
cli_msg(-1006, " Route change stats: received rejected filtered ignored accepted");
|
|
cli_msg(-1006, " Import updates: %10u %10u %10u %10u %10u",
|
|
s2->exp_updates_received, s2->exp_updates_rejected + s1->imp_updates_invalid,
|
|
s2->exp_updates_filtered, s1->imp_updates_ignored, s1->imp_updates_accepted);
|
|
cli_msg(-1006, " Import withdraws: %10u %10u --- %10u %10u",
|
|
s2->exp_withdraws_received, s1->imp_withdraws_invalid,
|
|
s1->imp_withdraws_ignored, s1->imp_withdraws_accepted);
|
|
cli_msg(-1006, " Export updates: %10u %10u %10u %10u %10u",
|
|
s1->exp_updates_received, s1->exp_updates_rejected + s2->imp_updates_invalid,
|
|
s1->exp_updates_filtered, s2->imp_updates_ignored, s2->imp_updates_accepted);
|
|
cli_msg(-1006, " Export withdraws: %10u %10u --- %10u %10u",
|
|
s1->exp_withdraws_received, s2->imp_withdraws_invalid,
|
|
s2->imp_withdraws_ignored, s2->imp_withdraws_accepted);
|
|
}
|
|
|
|
static const char *pipe_feed_state[] = { [ES_DOWN] = "down", [ES_FEEDING] = "feed", [ES_READY] = "up" };
|
|
|
|
static void
|
|
pipe_show_proto_info(struct proto *P)
|
|
{
|
|
struct pipe_proto *p = (void *) P;
|
|
|
|
cli_msg(-1006, " Channel %s", "main");
|
|
cli_msg(-1006, " Table: %s", p->pri->table->name);
|
|
cli_msg(-1006, " Peer table: %s", p->sec->table->name);
|
|
cli_msg(-1006, " Import state: %s", pipe_feed_state[p->sec->export_state]);
|
|
cli_msg(-1006, " Export state: %s", pipe_feed_state[p->pri->export_state]);
|
|
cli_msg(-1006, " Import filter: %s", filter_name(p->sec->out_filter));
|
|
cli_msg(-1006, " Export filter: %s", filter_name(p->pri->out_filter));
|
|
|
|
channel_show_limit(&p->pri->in_limit, "Import limit:");
|
|
channel_show_limit(&p->sec->in_limit, "Export limit:");
|
|
|
|
if (P->proto_state != PS_DOWN)
|
|
pipe_show_stats(p);
|
|
}
|
|
|
|
void
|
|
pipe_update_debug(struct proto *P)
|
|
{
|
|
struct pipe_proto *p = (void *) P;
|
|
|
|
p->pri->debug = p->sec->debug = p->p.debug;
|
|
}
|
|
|
|
|
|
struct protocol proto_pipe = {
|
|
.name = "Pipe",
|
|
.template = "pipe%d",
|
|
.class = PROTOCOL_PIPE,
|
|
.proto_size = sizeof(struct pipe_proto),
|
|
.config_size = sizeof(struct pipe_config),
|
|
.postconfig = pipe_postconfig,
|
|
.init = pipe_init,
|
|
.reconfigure = pipe_reconfigure,
|
|
.copy_config = pipe_copy_config,
|
|
.get_status = pipe_get_status,
|
|
.show_proto_info = pipe_show_proto_info
|
|
};
|
|
|
|
void
|
|
pipe_build(void)
|
|
{
|
|
proto_build(&proto_pipe);
|
|
}
|