bird/nest/rt-show.c

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/*
* BIRD -- Route Display Routines
*
* (c) 1998--2000 Martin Mares <mj@ucw.cz>
* (c) 2017 Jan Moskyto Matejka <mq@jmq.cz>
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
#undef LOCAL_DEBUG
#include "nest/bird.h"
#include "nest/route.h"
#include "nest/protocol.h"
#include "nest/cli.h"
#include "nest/iface.h"
#include "filter/filter.h"
#include "filter/data.h"
#include "sysdep/unix/krt.h"
static void
rt_show_table(struct cli *c, struct rt_show_data *d)
{
/* No table blocks in 'show route count' */
if (d->stats == 2)
return;
if (d->last_table) cli_printf(c, -1007, "");
cli_printf(c, -1007, "Table %s:", d->tab->table->name);
d->last_table = d->tab;
}
static inline struct krt_proto *
rt_show_get_kernel(struct rt_show_data *d)
{
struct proto_config *krt = d->tab->table->config->krt_attached;
return krt ? (struct krt_proto *) krt->proto : NULL;
}
static void
rt_show_rte(struct cli *c, byte *ia, rte *e, struct rt_show_data *d, int primary)
{
byte from[IPA_MAX_TEXT_LENGTH+8];
byte tm[TM_DATETIME_BUFFER_SIZE], info[256];
rta *a = e->attrs;
int sync_error = d->kernel ? krt_get_sync_error(d->kernel, e) : 0;
void (*get_route_info)(struct rte *, byte *buf);
struct nexthop *nh;
tm_format_time(tm, &config->tf_route, e->lastmod);
if (ipa_nonzero(a->from) && !ipa_equal(a->from, a->nh.gw))
bsprintf(from, " from %I", a->from);
else
from[0] = 0;
/* Need to normalize the extended attributes */
if (d->verbose && !rta_is_cached(a) && a->eattrs)
ea_normalize(a->eattrs);
get_route_info = e->src->proto->proto->get_route_info;
if (get_route_info)
get_route_info(e, info);
else
bsprintf(info, " (%d)", a->pref);
if (d->last_table != d->tab)
rt_show_table(c, d);
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cli_printf(c, -1007, "%-20s %s [%s %s%s]%s%s", ia, rta_dest_name(a->dest),
e->src->proto->name, tm, from, primary ? (sync_error ? " !" : " *") : "", info);
if (a->dest == RTD_UNICAST)
for (nh = &(a->nh); nh; nh = nh->next)
{
char mpls[MPLS_MAX_LABEL_STACK*12 + 5], *lsp = mpls;
char *onlink = (nh->flags & RNF_ONLINK) ? " onlink" : "";
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char weight[16] = "";
if (nh->labels)
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{
lsp += bsprintf(lsp, " mpls %d", nh->label[0]);
for (int i=1;i<nh->labels; i++)
lsp += bsprintf(lsp, "/%d", nh->label[i]);
}
*lsp = '\0';
if (a->nh.next)
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bsprintf(weight, " weight %d", nh->weight + 1);
if (ipa_nonzero(nh->gw))
cli_printf(c, -1007, "\tvia %I on %s%s%s%s",
nh->gw, nh->iface->name, mpls, onlink, weight);
else
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cli_printf(c, -1007, "\tdev %s%s%s",
nh->iface->name, mpls, onlink, weight);
}
if (d->verbose)
rta_show(c, a);
}
static void
rt_show_net(struct cli *c, net *n, struct rt_show_data *d)
{
rte *e, *ee;
byte ia[NET_MAX_TEXT_LENGTH+1];
struct channel *ec = d->tab->export_channel;
/* The Clang static analyzer complains that ec may be NULL.
* It should be ensured to be not NULL by rt_show_prepare_tables() */
ASSUME(!d->export_mode || ec);
int first = 1;
int first_show = 1;
int pass = 0;
for (e = n->routes; e; e = e->next)
{
if (rte_is_filtered(e) != d->filtered)
continue;
d->rt_counter++;
d->net_counter += first;
first = 0;
if (pass)
continue;
ee = e;
rte_make_tmp_attrs(&e, c->show_pool, NULL);
/* Export channel is down, do not try to export routes to it */
if (ec && (ec->export_state == ES_DOWN))
goto skip;
if (d->export_mode == RSEM_EXPORTED)
{
if (!bmap_test(&ec->export_map, ee->id))
goto skip;
// if (ec->ra_mode != RA_ANY)
// pass = 1;
}
else if ((d->export_mode == RSEM_EXPORT) && (ec->ra_mode == RA_MERGED))
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{
/* Special case for merged export */
rte *rt_free;
e = rt_export_merged(ec, n, &rt_free, c->show_pool, 1);
pass = 1;
if (!e)
{ e = ee; goto skip; }
}
else if (d->export_mode)
{
struct proto *ep = ec->proto;
int ic = ep->preexport ? ep->preexport(ep, e) : 0;
if (ec->ra_mode == RA_OPTIMAL || ec->ra_mode == RA_MERGED)
pass = 1;
if (ic < 0)
goto skip;
if (d->export_mode > RSEM_PREEXPORT)
{
/*
* FIXME - This shows what should be exported according to current
* filters, but not what was really exported. 'configure soft'
* command may change the export filter and do not update routes.
*/
int do_export = (ic > 0) ||
(f_run(ec->out_filter, &e, c->show_pool, FF_SILENT) <= F_ACCEPT);
if (do_export != (d->export_mode == RSEM_EXPORT))
goto skip;
if ((d->export_mode == RSEM_EXPORT) && (ec->ra_mode == RA_ACCEPTED))
pass = 1;
}
}
if (d->show_protocol && (d->show_protocol != e->src->proto))
goto skip;
if (f_run(d->filter, &e, c->show_pool, 0) > F_ACCEPT)
goto skip;
if (d->stats < 2)
{
if (first_show)
net_format(n->n.addr, ia, sizeof(ia));
else
ia[0] = 0;
rt_show_rte(c, ia, e, d, (e->net->routes == ee));
first_show = 0;
}
d->show_counter++;
skip:
if (e != ee)
{
rte_free(e);
e = ee;
}
lp_flush(c->show_pool);
if (d->primary_only)
break;
}
}
static void
rt_show_cleanup(struct cli *c)
{
struct rt_show_data *d = c->rover;
struct rt_show_data_rtable *tab;
/* Unlink the iterator */
if (d->table_open && !d->trie_walk)
fit_get(&d->tab->table->fib, &d->fit);
if (d->walk_lock)
rt_unlock_trie(d->tab->table, d->walk_lock);
/* Unlock referenced tables */
WALK_LIST(tab, d->tables)
rt_unlock_table(tab->table);
}
static void
rt_show_cont(struct cli *c)
{
struct rt_show_data *d = c->rover;
struct rtable *tab = d->tab->table;
#ifdef DEBUGGING
unsigned max = 4;
#else
unsigned max = 64;
#endif
struct fib *fib = &tab->fib;
struct fib_iterator *it = &d->fit;
if (d->running_on_config && (d->running_on_config != config))
{
cli_printf(c, 8004, "Stopped due to reconfiguration");
goto done;
}
if (!d->table_open)
{
/* We use either trie-based walk or fib-based walk */
d->trie_walk = tab->trie &&
(d->addr_mode == RSD_ADDR_IN) &&
net_val_match(tab->addr_type, NB_IP);
if (d->trie_walk && !d->walk_state)
d->walk_state = lp_allocz(c->parser_pool, sizeof (struct f_trie_walk_state));
if (d->trie_walk)
{
d->walk_lock = rt_lock_trie(tab);
trie_walk_init(d->walk_state, tab->trie, d->addr);
}
else
FIB_ITERATE_INIT(&d->fit, &tab->fib);
d->table_open = 1;
d->table_counter++;
d->kernel = rt_show_get_kernel(d);
d->show_counter_last = d->show_counter;
d->rt_counter_last = d->rt_counter;
d->net_counter_last = d->net_counter;
if (d->tables_defined_by & RSD_TDB_SET)
rt_show_table(c, d);
}
if (d->trie_walk)
{
/* Trie-based walk */
net_addr addr;
while (trie_walk_next(d->walk_state, &addr))
{
net *n = net_find(tab, &addr);
if (!n)
continue;
rt_show_net(c, n, d);
if (!--max)
return;
}
rt_unlock_trie(tab, d->walk_lock);
d->walk_lock = NULL;
}
else
{
/* fib-based walk */
FIB_ITERATE_START(fib, it, net, n)
{
if ((d->addr_mode == RSD_ADDR_IN) && (!net_in_netX(n->n.addr, d->addr)))
goto next;
if (!max--)
{
FIB_ITERATE_PUT(it);
return;
}
rt_show_net(c, n, d);
next:;
}
FIB_ITERATE_END;
}
if (d->stats)
{
if (d->last_table != d->tab)
rt_show_table(c, d);
cli_printf(c, -1007, "%d of %d routes for %d networks in table %s",
d->show_counter - d->show_counter_last, d->rt_counter - d->rt_counter_last,
d->net_counter - d->net_counter_last, tab->name);
}
d->kernel = NULL;
d->table_open = 0;
d->tab = NODE_NEXT(d->tab);
if (NODE_VALID(d->tab))
return;
if (d->stats && (d->table_counter > 1))
{
if (d->last_table) cli_printf(c, -1007, "");
cli_printf(c, 14, "Total: %d of %d routes for %d networks in %d tables",
d->show_counter, d->rt_counter, d->net_counter, d->table_counter);
}
else
cli_printf(c, 0, "");
done:
rt_show_cleanup(c);
c->cont = c->cleanup = NULL;
}
struct rt_show_data_rtable *
rt_show_add_table(struct rt_show_data *d, rtable *t)
{
struct rt_show_data_rtable *tab = cfg_allocz(sizeof(struct rt_show_data_rtable));
tab->table = t;
add_tail(&(d->tables), &(tab->n));
return tab;
}
static inline void
rt_show_get_default_tables(struct rt_show_data *d)
{
struct channel *c;
struct rt_show_data_rtable *tab;
if (d->export_channel)
{
c = d->export_channel;
tab = rt_show_add_table(d, c->table);
tab->export_channel = c;
return;
}
if (d->export_protocol)
{
WALK_LIST(c, d->export_protocol->channels)
{
if (c->export_state == ES_DOWN)
continue;
tab = rt_show_add_table(d, c->table);
tab->export_channel = c;
}
return;
}
if (d->show_protocol)
{
WALK_LIST(c, d->show_protocol->channels)
rt_show_add_table(d, c->table);
return;
}
for (int i=1; i<NET_MAX; i++)
if (config->def_tables[i] && config->def_tables[i]->table)
rt_show_add_table(d, config->def_tables[i]->table);
}
static inline void
rt_show_prepare_tables(struct rt_show_data *d)
{
struct rt_show_data_rtable *tab, *tabx;
/* Add implicit tables if no table is specified */
if (EMPTY_LIST(d->tables))
rt_show_get_default_tables(d);
WALK_LIST_DELSAFE(tab, tabx, d->tables)
{
/* Ensure there is defined export_channel for each table */
if (d->export_mode)
{
if (!tab->export_channel && d->export_channel &&
(tab->table == d->export_channel->table))
tab->export_channel = d->export_channel;
if (!tab->export_channel && d->export_protocol)
tab->export_channel = proto_find_channel_by_table(d->export_protocol, tab->table);
if (!tab->export_channel)
{
if (d->tables_defined_by & RSD_TDB_NMN)
cf_error("No export channel for table %s", tab->table->name);
rem_node(&(tab->n));
continue;
}
}
/* Ensure specified network is compatible with each table */
if (d->addr && (tab->table->addr_type != d->addr->type))
{
if (d->tables_defined_by & RSD_TDB_NMN)
cf_error("Incompatible type of prefix/ip for table %s", tab->table->name);
rem_node(&(tab->n));
continue;
}
}
/* Ensure there is at least one table */
if (EMPTY_LIST(d->tables))
cf_error("No valid tables");
}
void
rt_show(struct rt_show_data *d)
{
struct rt_show_data_rtable *tab;
net *n;
/* Filtered routes are neither exported nor have sensible ordering */
if (d->filtered && (d->export_mode || d->primary_only))
cf_error("Incompatible show route options");
rt_show_prepare_tables(d);
if (!d->addr || (d->addr_mode == RSD_ADDR_IN))
{
WALK_LIST(tab, d->tables)
rt_lock_table(tab->table);
/* There is at least one table */
d->tab = HEAD(d->tables);
this_cli->cont = rt_show_cont;
this_cli->cleanup = rt_show_cleanup;
this_cli->rover = d;
}
else
{
WALK_LIST(tab, d->tables)
{
d->tab = tab;
d->kernel = rt_show_get_kernel(d);
if (d->addr_mode == RSD_ADDR_FOR)
n = net_route(tab->table, d->addr);
else
n = net_find(tab->table, d->addr);
if (n)
rt_show_net(this_cli, n, d);
}
if (d->rt_counter)
cli_msg(0, "");
else
cli_msg(8001, "Network not found");
}
}