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038fcf1c8b
bird/nest/proto.c
Maria Matejka f0507f05ce Route sources have an explicit owner 
This commit prevents use-after-free of routes belonging to protocols
which have been already destroyed, delaying also all the protocols'
shutdown until all of their routes have been finally propagated through
all the pipes down to the appropriate exports.

The use-after-free was somehow hypothetic yet theoretically possible in
rare conditions, when one BGP protocol authors a lot of routes and the
user deletes that protocol by reconfiguring in the same time as next hop
update is requested, causing rte_better() to be called on a
not-yet-pruned network prefix while the owner protocol has been already
freed.

In parallel execution environments, this would happen an inter-thread
use-after-free, causing possible heisenbugs or other nasty problems.
2021-11-22 19:05:44 +01:00

2855 lines
72 KiB
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/*
* BIRD -- Protocols
*
* (c) 1998--2000 Martin Mares <mj@ucw.cz>
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
#undef LOCAL_DEBUG
#include "nest/bird.h"
#include "nest/protocol.h"
#include "lib/resource.h"
#include "lib/lists.h"
#include "lib/event.h"
#include "lib/timer.h"
#include "lib/string.h"
#include "lib/coro.h"
#include "conf/conf.h"
#include "nest/route.h"
#include "nest/iface.h"
#include "nest/cli.h"
#include "filter/filter.h"
#include "filter/f-inst.h"
pool *proto_pool;
list proto_list;
static list protocol_list;
struct protocol *class_to_protocol[PROTOCOL__MAX];
#define CD(c, msg, args...) ({ if (c->debug & D_STATES) log(L_TRACE "%s.%s: " msg, c->proto->name, c->name ?: "?", ## args); })
#define PD(p, msg, args...) ({ if (p->debug & D_STATES) log(L_TRACE "%s: " msg, p->name, ## args); })
static timer *proto_shutdown_timer;
static timer *gr_wait_timer;
#define GRS_NONE 0
#define GRS_INIT 1
#define GRS_ACTIVE 2
#define GRS_DONE 3
static int graceful_restart_state;
static u32 graceful_restart_locks;
static char *p_states[] = { "DOWN", "START", "UP", "STOP" };
static char *c_states[] = { "DOWN", "START", "UP", "STOP", "RESTART" };
extern struct protocol proto_unix_iface;
static void channel_aux_request_refeed(struct channel_aux_table *cat);
static void proto_shutdown_loop(timer *);
static void proto_rethink_goal(struct proto *p);
static char *proto_state_name(struct proto *p);
static void channel_init_limit(struct channel *c, struct limit *l, int dir, struct channel_limit *cf);
static void channel_update_limit(struct channel *c, struct limit *l, int dir, struct channel_limit *cf);
static void channel_reset_limit(struct channel *c, struct limit *l, int dir);
static void channel_feed_end(struct channel *c);
static void channel_export_stopped(struct rt_export_request *req);
static inline int proto_is_done(struct proto *p)
{ return (p->proto_state == PS_DOWN) && proto_is_inactive(p); }
static inline event_list *proto_event_list(struct proto *p)
{ return p->loop == &main_birdloop ? &global_event_list : birdloop_event_list(p->loop); }
static inline event_list *proto_work_list(struct proto *p)
{ return p->loop == &main_birdloop ? &global_work_list : birdloop_event_list(p->loop); }
static inline void proto_send_event(struct proto *p)
{ ev_send(proto_event_list(p), p->event); }
#define PROTO_ENTER_FROM_MAIN(p) ({ \
ASSERT_DIE(birdloop_inside(&main_birdloop)); \
struct birdloop *_loop = (p)->loop; \
if (_loop != &main_birdloop) birdloop_enter(_loop); \
_loop; \
})
#define PROTO_LEAVE_FROM_MAIN(loop) ({ if (loop != &main_birdloop) birdloop_leave(loop); })
#define PROTO_LOCKED_FROM_MAIN(p) for (struct birdloop *_proto_loop = PROTO_ENTER_FROM_MAIN(p); _proto_loop; PROTO_LEAVE_FROM_MAIN(_proto_loop), (_proto_loop = NULL))
static inline int channel_is_active(struct channel *c)
{ return (c->channel_state != CS_DOWN); }
static inline int channel_reloadable(struct channel *c)
{ return c->proto->reload_routes && c->reloadable; }
static inline void
channel_log_state_change(struct channel *c)
{
CD(c, "State changed to %s", c_states[c->channel_state]);
}
void
channel_import_log_state_change(struct rt_import_request *req, u8 state)
{
struct channel *c = SKIP_BACK(struct channel, in_req, req);
CD(c, "Channel import state changed to %s", rt_import_state_name(state));
}
void
channel_export_log_state_change(struct rt_export_request *req, u8 state)
{
struct channel *c = SKIP_BACK(struct channel, out_req, req);
CD(c, "Channel export state changed to %s", rt_export_state_name(state));
switch (state)
{
case TES_FEEDING:
if (c->out_table)
rt_refresh_begin(&c->out_table->push);
else if (c->proto->feed_begin)
c->proto->feed_begin(c, !c->refeeding);
break;
case TES_READY:
channel_feed_end(c);
break;
}
}
static void
channel_dump_import_req(struct rt_import_request *req)
{
struct channel *c = SKIP_BACK(struct channel, in_req, req);
debug(" Channel %s.%s import request %p\n", c->proto->name, c->name, req);
}
static void
channel_dump_export_req(struct rt_export_request *req)
{
struct channel *c = SKIP_BACK(struct channel, out_req, req);
debug(" Channel %s.%s export request %p\n", c->proto->name, c->name, req);
}
static void
proto_log_state_change(struct proto *p)
{
if (p->debug & D_STATES)
{
char *name = proto_state_name(p);
if (name != p->last_state_name_announced)
{
p->last_state_name_announced = name;
PD(p, "State changed to %s", proto_state_name(p));
}
}
else
p->last_state_name_announced = NULL;
}
struct channel_config *
proto_cf_find_channel(struct proto_config *pc, uint net_type)
{
struct channel_config *cc;
WALK_LIST(cc, pc->channels)
if (cc->net_type == net_type)
return cc;
return NULL;
}
/**
* proto_find_channel_by_table - find channel connected to a routing table
* @p: protocol instance
* @t: routing table
*
* Returns pointer to channel or NULL
*/
struct channel *
proto_find_channel_by_table(struct proto *p, struct rtable *t)
{
struct channel *c;
WALK_LIST(c, p->channels)
if (c->table == t)
return c;
return NULL;
}
/**
* proto_find_channel_by_name - find channel by its name
* @p: protocol instance
* @n: channel name
*
* Returns pointer to channel or NULL
*/
struct channel *
proto_find_channel_by_name(struct proto *p, const char *n)
{
struct channel *c;
WALK_LIST(c, p->channels)
if (!strcmp(c->name, n))
return c;
return NULL;
}
rte * channel_preimport(struct rt_import_request *req, rte *new, rte *old);
rte * channel_in_preimport(struct rt_import_request *req, rte *new, rte *old);
void rt_notify_optimal(struct rt_export_request *req, const net_addr *net, struct rt_pending_export *rpe);
void rt_notify_any(struct rt_export_request *req, const net_addr *net, struct rt_pending_export *rpe);
void rt_feed_any(struct rt_export_request *req, const net_addr *net, struct rt_pending_export *rpe, rte **feed, uint count);
void rt_notify_accepted(struct rt_export_request *req, const net_addr *net, struct rt_pending_export *rpe, rte **feed, uint count);
void rt_notify_merged(struct rt_export_request *req, const net_addr *net, struct rt_pending_export *rpe, rte **feed, uint count);
/**
* proto_add_channel - connect protocol to a routing table
* @p: protocol instance
* @cf: channel configuration
*
* This function creates a channel between the protocol instance @p and the
* routing table specified in the configuration @cf, making the protocol hear
* all changes in the table and allowing the protocol to update routes in the
* table.
*
* The channel is linked in the protocol channel list and when active also in
* the table channel list. Channels are allocated from the global resource pool
* (@proto_pool) and they are automatically freed when the protocol is removed.
*/
struct channel *
proto_add_channel(struct proto *p, struct channel_config *cf)
{
struct channel *c = mb_allocz(proto_pool, cf->channel->channel_size);
c->name = cf->name;
c->channel = cf->channel;
c->proto = p;
c->table = cf->table->table;
rt_lock_table(c->table);
c->in_filter = cf->in_filter;
c->out_filter = cf->out_filter;
channel_init_limit(c, &c->rx_limit, PLD_RX, &cf->rx_limit);
channel_init_limit(c, &c->in_limit, PLD_IN, &cf->in_limit);
channel_init_limit(c, &c->out_limit, PLD_OUT, &cf->out_limit);
c->net_type = cf->net_type;
c->ra_mode = cf->ra_mode;
c->preference = cf->preference;
c->debug = cf->debug;
c->merge_limit = cf->merge_limit;
c->in_keep_filtered = cf->in_keep_filtered;
c->rpki_reload = cf->rpki_reload;
c->channel_state = CS_DOWN;
c->last_state_change = current_time();
c->reloadable = 1;
init_list(&c->roa_subscriptions);
CALL(c->channel->init, c, cf);
add_tail(&p->channels, &c->n);
CD(c, "Connected to table %s", c->table->name);
return c;
}
void
proto_remove_channel(struct proto *p UNUSED, struct channel *c)
{
ASSERT(c->channel_state == CS_DOWN);
CD(c, "Removed", c->name);
rt_unlock_table(c->table);
rem_node(&c->n);
mb_free(c);
}
static void
proto_start_channels(struct proto *p)
{
struct channel *c;
WALK_LIST(c, p->channels)
if (!c->disabled)
channel_set_state(c, CS_UP);
}
static void
proto_pause_channels(struct proto *p)
{
struct channel *c;
WALK_LIST(c, p->channels)
if (!c->disabled && channel_is_active(c))
channel_set_state(c, CS_PAUSE);
}
static void
proto_stop_channels(struct proto *p)
{
struct channel *c;
WALK_LIST(c, p->channels)
if (!c->disabled && channel_is_active(c))
channel_set_state(c, CS_STOP);
}
static void
proto_remove_channels(struct proto *p)
{
struct channel *c;
WALK_LIST_FIRST(c, p->channels)
proto_remove_channel(p, c);
}
static void
channel_roa_in_changed(struct rt_subscription *s)
{
struct channel *c = s->data;
CD(c, "Reload triggered by RPKI change");
channel_request_reload(c);
}
static void
channel_roa_out_changed(struct rt_subscription *s)
{
struct channel *c = s->data;
CD(c, "Feeding triggered by RPKI change");
c->refeed_pending = 1;
if (c->out_req.hook)
rt_stop_export(&c->out_req, channel_export_stopped);
}
/* Temporary code, subscriptions should be changed to resources */
struct roa_subscription {
struct rt_subscription s;
node roa_node;
};
static int
channel_roa_is_subscribed(struct channel *c, rtable *tab, int dir)
{
void (*hook)(struct rt_subscription *) =
dir ? channel_roa_in_changed : channel_roa_out_changed;
struct roa_subscription *s;
node *n;
WALK_LIST2(s, n, c->roa_subscriptions, roa_node)
if ((s->s.tab == tab) && (s->s.hook == hook))
return 1;
return 0;
}
static void
channel_roa_subscribe(struct channel *c, rtable *tab, int dir)
{
if (channel_roa_is_subscribed(c, tab, dir))
return;
struct roa_subscription *s = mb_allocz(c->proto->pool, sizeof(struct roa_subscription));
s->s.hook = dir ? channel_roa_in_changed : channel_roa_out_changed;
s->s.data = c;
rt_subscribe(tab, &s->s);
add_tail(&c->roa_subscriptions, &s->roa_node);
}
static void
channel_roa_unsubscribe(struct roa_subscription *s)
{
rt_unsubscribe(&s->s);
rem_node(&s->roa_node);
mb_free(s);
}
static void
channel_roa_subscribe_filter(struct channel *c, int dir)
{
const struct filter *f = dir ? c->in_filter : c->out_filter;
struct rtable *tab;
int valid = 1, found = 0;
if ((f == FILTER_ACCEPT) || (f == FILTER_REJECT))
return;
/* No automatic reload for non-reloadable channels */
if (dir && !channel_reloadable(c))
valid = 0;
#ifdef CONFIG_BGP
/* No automatic reload for BGP channels without in_table / out_table */
if (c->channel == &channel_bgp)
valid = dir ? !!c->in_table : !!c->out_table;
#endif
struct filter_iterator fit;
FILTER_ITERATE_INIT(&fit, f, c->proto->pool);
FILTER_ITERATE(&fit, fi)
{
switch (fi->fi_code)
{
case FI_ROA_CHECK_IMPLICIT:
tab = fi->i_FI_ROA_CHECK_IMPLICIT.rtc->table;
if (valid) channel_roa_subscribe(c, tab, dir);
found = 1;
break;
case FI_ROA_CHECK_EXPLICIT:
tab = fi->i_FI_ROA_CHECK_EXPLICIT.rtc->table;
if (valid) channel_roa_subscribe(c, tab, dir);
found = 1;
break;
default:
break;
}
}
FILTER_ITERATE_END;
FILTER_ITERATE_CLEANUP(&fit);
if (!valid && found)
log(L_WARN "%s.%s: Automatic RPKI reload not active for %s",
c->proto->name, c->name ?: "?", dir ? "import" : "export");
}
static void
channel_roa_unsubscribe_all(struct channel *c)
{
struct roa_subscription *s;
node *n, *x;
WALK_LIST2_DELSAFE(s, n, x, c->roa_subscriptions, roa_node)
channel_roa_unsubscribe(s);
}
static void
channel_start_import(struct channel *c)
{
if (c->in_req.hook)
{
log(L_WARN "%s.%s: Attempted to start channel's already started import", c->proto->name, c->name);
return;
}
int nlen = strlen(c->name) + strlen(c->proto->name) + 2;
char *rn = mb_allocz(c->proto->pool, nlen);
bsprintf(rn, "%s.%s", c->proto->name, c->name);
c->in_req = (struct rt_import_request) {
.name = rn,
.trace_routes = c->debug | c->proto->debug,
.dump_req = channel_dump_import_req,
.log_state_change = channel_import_log_state_change,
.preimport = channel_preimport,
};
ASSERT(c->channel_state == CS_UP);
channel_reset_limit(c, &c->rx_limit, PLD_RX);
channel_reset_limit(c, &c->in_limit, PLD_IN);
memset(&c->import_stats, 0, sizeof(struct channel_import_stats));
DBG("%s.%s: Channel start import req=%p\n", c->proto->name, c->name, &c->in_req);
rt_request_import(c->table, &c->in_req);
}
static void
channel_start_export(struct channel *c)
{
if (c->out_req.hook)
{
c->restart_export = 1;
log(L_WARN "%s.%s: Fast channel export restart", c->proto->name, c->name);
return;
}
ASSERT(c->channel_state == CS_UP);
int nlen = strlen(c->name) + strlen(c->proto->name) + 2;
char *rn = mb_allocz(c->proto->pool, nlen);
bsprintf(rn, "%s.%s", c->proto->name, c->name);
c->out_req = (struct rt_export_request) {
.name = rn,
.list = proto_work_list(c->proto),
.trace_routes = c->debug | c->proto->debug,
.dump_req = channel_dump_export_req,
.log_state_change = channel_export_log_state_change,
};
bmap_init(&c->export_map, c->proto->pool, 1024);
bmap_init(&c->export_reject_map, c->proto->pool, 1024);
channel_reset_limit(c, &c->out_limit, PLD_OUT);
memset(&c->export_stats, 0, sizeof(struct channel_export_stats));
switch (c->ra_mode) {
case RA_OPTIMAL:
c->out_req.export_one = rt_notify_optimal;
break;
case RA_ANY:
c->out_req.export_one = rt_notify_any;
c->out_req.export_bulk = rt_feed_any;
break;
case RA_ACCEPTED:
c->out_req.export_bulk = rt_notify_accepted;
break;
case RA_MERGED:
c->out_req.export_bulk = rt_notify_merged;
break;
default:
bug("Unknown route announcement mode");
}
DBG("%s.%s: Channel start export req=%p\n", c->proto->name, c->name, &c->out_req);
rt_request_export(c->table, &c->out_req);
}
static void
channel_check_stopped(struct channel *c)
{
switch (c->channel_state)
{
case CS_STOP:
if (c->out_req.hook || c->in_req.hook || c->out_table || c->in_table)
return;
channel_set_state(c, CS_DOWN);
proto_send_event(c->proto);
break;
case CS_PAUSE:
if (c->out_req.hook)
return;
channel_set_state(c, CS_START);
break;
default:
bug("Stopped channel in a bad state: %d", c->channel_state);
}
DBG("%s.%s: Channel requests/hooks stopped (in state %s)\n", c->proto->name, c->name, c_states[c->channel_state]);
}
void
channel_import_stopped(struct rt_import_request *req)
{
struct channel *c = SKIP_BACK(struct channel, in_req, req);
req->hook = NULL;
mb_free(c->in_req.name);
c->in_req.name = NULL;
channel_check_stopped(c);
}
static void
channel_export_stopped(struct rt_export_request *req)
{
struct channel *c = SKIP_BACK(struct channel, out_req, req);
/* The hook has already stopped */
req->hook = NULL;
if (c->refeed_pending)
{
c->refeeding = 1;
c->refeed_pending = 0;
rt_request_export(c->table, req);
return;
}
mb_free(c->out_req.name);
c->out_req.name = NULL;
if (c->restart_export)
{
c->restart_export = 0;
channel_start_export(c);
}
else
channel_check_stopped(c);
}
static void
channel_feed_end(struct channel *c)
{
struct rt_export_request *req = &c->out_req;
/* Reset export limit if the feed ended with acceptable number of exported routes */
struct limit *l = &c->out_limit;
if (c->refeeding &&
(c->limit_active & (1 << PLD_OUT)) &&
(c->refeed_count <= l->max) &&
(l->count <= l->max))
{
log(L_INFO "Protocol %s resets route export limit (%u)", c->proto->name, l->max);
c->refeed_pending = 1;
rt_stop_export(req, channel_export_stopped);
return;
}
if (c->out_table)
rt_refresh_end(&c->out_table->push);
else if (c->proto->feed_end)
c->proto->feed_end(c);
if (c->refeed_pending)
rt_stop_export(req, channel_export_stopped);
}
#define CHANNEL_AUX_TABLE_DUMP_REQ(inout, imex, pgimex, pushget) static void \
channel_##inout##_##pushget##_dump_req(struct rt_##pgimex##_request *req) { \
struct channel_aux_table *cat = SKIP_BACK(struct channel_aux_table, pushget, req); \
debug(" Channel %s.%s " #imex " table " #pushget " request %p\n", cat->c->proto->name, cat->c->name, req); }
CHANNEL_AUX_TABLE_DUMP_REQ(in, import, import, push)
CHANNEL_AUX_TABLE_DUMP_REQ(in, import, export, get)
CHANNEL_AUX_TABLE_DUMP_REQ(out, export, import, push)
CHANNEL_AUX_TABLE_DUMP_REQ(out, export, export, get)
#undef CHANNEL_AUX_TABLE_DUMP_REQ
static uint channel_aux_imex(struct channel_aux_table *cat)
{
if (cat->c->in_table == cat)
return 0;
else if (cat->c->out_table == cat)
return 1;
else
bug("Channel aux table must be in_table or out_table");
}
static void
channel_aux_stopped(void *data)
{
struct channel_aux_table *cat = data;
struct channel *c = cat->c;
if (channel_aux_imex(cat))
c->out_table = NULL;
else
c->in_table = NULL;
rfree(cat->tab->rp);
mb_free(cat);
return channel_check_stopped(c);
}
static void
channel_aux_import_stopped(struct rt_import_request *req)
{
struct channel_aux_table *cat = SKIP_BACK(struct channel_aux_table, push, req);
ASSERT_DIE(cat->tab->delete_event);
}
static void
channel_aux_export_stopped(struct rt_export_request *req)
{
struct channel_aux_table *cat = SKIP_BACK(struct channel_aux_table, get, req);
req->hook = NULL;
if (cat->refeed_pending && !cat->tab->delete_event)
{
cat->refeed_pending = 0;
rt_request_export(cat->tab, req);
}
else
ASSERT_DIE(cat->tab->delete_event);
}
static void
channel_aux_stop(struct channel_aux_table *cat)
{
rt_stop_import(&cat->push, channel_aux_import_stopped);
rt_stop_export(&cat->get, channel_aux_export_stopped);
cat->tab->delete_event = ev_new_init(cat->tab->rp, channel_aux_stopped, cat);
rt_unlock_table(cat->tab);
}
static void
channel_push_log_state_change(struct rt_import_request *req, u8 state)
{
struct channel_aux_table *cat = SKIP_BACK(struct channel_aux_table, push, req);
const char *imex = channel_aux_imex(cat) ? "export" : "import";
CD(cat->c, "Channel %s table import state changed to %s", imex, rt_import_state_name(state));
}
static void
channel_get_log_state_change(struct rt_export_request *req, u8 state)
{
struct channel_aux_table *cat = SKIP_BACK(struct channel_aux_table, get, req);
const char *imex = channel_aux_imex(cat) ? "export" : "import";
CD(cat->c, "Channel %s table export state changed to %s", imex, rt_export_state_name(state));
switch (state)
{
case TES_FEEDING:
if (imex && cat->c->proto->feed_begin)
cat->c->proto->feed_begin(cat->c, !cat->c->refeeding);
else if (!imex)
rt_refresh_begin(&cat->c->in_req);
break;
case TES_READY:
if (imex && cat->c->proto->feed_end)
cat->c->proto->feed_end(cat->c);
else if (!imex)
rt_refresh_end(&cat->c->in_req);
if (cat->refeed_pending)
rt_stop_export(&cat->get, channel_aux_export_stopped);
break;
}
}
void rte_update_direct(struct channel *c, const net_addr *n, rte *new, struct rte_src *src);
static int
channel_aux_export_one_any(struct rt_export_request *req, struct rt_pending_export *rpe, rte **new, rte **old)
{
struct rte_src *src = rpe->new ? rpe->new->rte.src : rpe->old->rte.src;
*old = RTES_OR_NULL(rpe->old);
struct rte_storage *new_stored;
while (rpe)
{
new_stored = rpe->new;
rpe_mark_seen(req->hook, rpe);
rpe = rpe_next(rpe, src);
}
*new = RTES_CLONE(new_stored, *new);
return (*new || *old) && (&new_stored->rte != *old);
}
static int
channel_aux_export_one_best(struct rt_export_request *req, struct rt_pending_export *rpe, rte **new, rte **old)
{
*old = RTES_OR_NULL(rpe->old_best);
struct rte_storage *new_stored;
while (rpe)
{
new_stored = rpe->new_best;
rpe_mark_seen(req->hook, rpe);
rpe = rpe_next(rpe, NULL);
}
*new = RTES_CLONE(new_stored, *new);
return (*new || *old) && (&new_stored->rte != *old);
}
static void
channel_in_export_one_any(struct rt_export_request *req, const net_addr *net, struct rt_pending_export *rpe)
{
struct channel_aux_table *cat = SKIP_BACK(struct channel_aux_table, get, req);
rte n0, *new = &n0, *old;
if (channel_aux_export_one_any(req, rpe, &new, &old))
rte_update_direct(cat->c, net, new, old ? old->src : new->src);
}
static void
channel_in_export_one_best(struct rt_export_request *req, const net_addr *net, struct rt_pending_export *rpe)
{
struct channel_aux_table *cat = SKIP_BACK(struct channel_aux_table, get, req);
rte n0, *new = &n0, *old;
if (channel_aux_export_one_best(req, rpe, &new, &old))
rte_update_direct(cat->c, net, new, old ? old->src : new->src);
}
static void
channel_in_export_bulk_any(struct rt_export_request *req, const net_addr *net, struct rt_pending_export *rpe UNUSED, rte **feed, uint count)
{
struct channel_aux_table *cat = SKIP_BACK(struct channel_aux_table, get, req);
for (uint i=0; i<count; i++)
{
rte n0 = *feed[i];
rte_update_direct(cat->c, net, &n0, n0.src);
}
}
static void
channel_in_export_bulk_best(struct rt_export_request *req, const net_addr *net, struct rt_pending_export *rpe UNUSED, rte **feed, uint count)
{
struct channel_aux_table *cat = SKIP_BACK(struct channel_aux_table, get, req);
if (!count)
return;
rte n0 = *feed[0];
rte_update_direct(cat->c, net, &n0, n0.src);
}
void do_rt_notify_direct(struct channel *c, const net_addr *net, rte *new, const rte *old);
static void
channel_out_export_one_any(struct rt_export_request *req, const net_addr *net, struct rt_pending_export *rpe)
{
struct channel_aux_table *cat = SKIP_BACK(struct channel_aux_table, get, req);
rte n0, *new = &n0, *old;
if (channel_aux_export_one_any(req, rpe, &new, &old))
do_rt_notify_direct(cat->c, net, new, old);
}
static void
channel_out_export_one_best(struct rt_export_request *req, const net_addr *net, struct rt_pending_export *rpe)
{
struct channel_aux_table *cat = SKIP_BACK(struct channel_aux_table, get, req);
rte n0, *new = &n0, *old;
if (channel_aux_export_one_best(req, rpe, &new, &old))
do_rt_notify_direct(cat->c, net, new, old);
}
static void
channel_out_export_bulk(struct rt_export_request *req, const net_addr *net, struct rt_pending_export *rpe UNUSED, rte **feed, uint count)
{
struct channel_aux_table *cat = SKIP_BACK(struct channel_aux_table, get, req);
if (cat->c->ra_mode != RA_ANY)
ASSERT_DIE(count <= 1);
for (uint i=0; i<count; i++)
{
rte n0 = *feed[i];
do_rt_notify_direct(cat->c, net, &n0, NULL);
}
}
/* Called by protocol to activate in_table */
void
channel_setup_in_table(struct channel *c, int best)
{
int nlen = sizeof("import") + strlen(c->name) + strlen(c->proto->name) + 3;
struct {
struct channel_aux_table cat;
struct rtable_config tab_cf;
char name[0];
} *cat = mb_allocz(c->proto->pool, sizeof(*cat) + nlen);
bsprintf(cat->name, "%s.%s.import", c->proto->name, c->name);
cat->tab_cf.name = cat->name;
cat->tab_cf.addr_type = c->net_type;
c->in_table = &cat->cat;
c->in_table->push = (struct rt_import_request) {
.name = cat->name,
.trace_routes = c->debug | c->proto->debug,
.dump_req = channel_in_push_dump_req,
.log_state_change = channel_push_log_state_change,
.preimport = channel_in_preimport,
};
c->in_table->get = (struct rt_export_request) {
.name = cat->name,
.list = proto_work_list(c->proto),
.trace_routes = c->debug | c->proto->debug,
.dump_req = channel_in_get_dump_req,
.log_state_change = channel_get_log_state_change,
.export_one = best ? channel_in_export_one_best : channel_in_export_one_any,
.export_bulk = best ? channel_in_export_bulk_best : channel_in_export_bulk_any,
};
c->in_table->c = c;
c->in_table->tab = rt_setup(c->proto->pool, &cat->tab_cf);
rt_lock_table(c->in_table->tab);
rt_request_import(c->in_table->tab, &c->in_table->push);
rt_request_export(c->in_table->tab, &c->in_table->get);
}
/* Called by protocol to activate out_table */
void
channel_setup_out_table(struct channel *c)
{
int nlen = sizeof("export") + strlen(c->name) + strlen(c->proto->name) + 3;
struct {
struct channel_aux_table cat;
struct rtable_config tab_cf;
char name[0];
} *cat = mb_allocz(c->proto->pool, sizeof(*cat) + nlen);
bsprintf(cat->name, "%s.%s.export", c->proto->name, c->name);
cat->tab_cf.name = cat->name;
cat->tab_cf.addr_type = c->net_type;
c->out_table = &cat->cat;
c->out_table->push = (struct rt_import_request) {
.name = cat->name,
.trace_routes = c->debug | c->proto->debug,
.dump_req = channel_out_push_dump_req,
.log_state_change = channel_push_log_state_change,
};
c->out_table->get = (struct rt_export_request) {
.name = cat->name,
.list = proto_work_list(c->proto),
.trace_routes = c->debug | c->proto->debug,
.dump_req = channel_out_get_dump_req,
.log_state_change = channel_get_log_state_change,
.export_one = (c->ra_mode == RA_ANY) ? channel_out_export_one_any : channel_out_export_one_best,
.export_bulk = channel_out_export_bulk,
};
c->out_table->c = c;
c->out_table->tab = rt_setup(c->proto->pool, &cat->tab_cf);
rt_lock_table(c->out_table->tab);
rt_request_import(c->out_table->tab, &c->out_table->push);
rt_request_export(c->out_table->tab, &c->out_table->get);
}
static void
channel_aux_request_refeed(struct channel_aux_table *cat)
{
cat->refeed_pending = 1;
rt_stop_export(&cat->get, channel_aux_export_stopped);
}
static void
channel_do_start(struct channel *c)
{
c->proto->active_channels++;
CALL(c->channel->start, c);
channel_start_import(c);
}
static void
channel_do_up(struct channel *c)
{
/* Register RPKI/ROA subscriptions */
if (c->rpki_reload)
{
channel_roa_subscribe_filter(c, 1);
channel_roa_subscribe_filter(c, 0);
}
}
static void
channel_do_pause(struct channel *c)
{
/* Stop export */
if (c->out_req.hook)
{
rt_stop_export(&c->out_req, channel_export_stopped);
c->refeeding = 0;
}
channel_roa_unsubscribe_all(c);
bmap_free(&c->export_map);
bmap_free(&c->export_reject_map);
}
static void
channel_do_stop(struct channel *c)
{
/* Drop auxiliary tables */
if (c->in_table)
channel_aux_stop(c->in_table);
if (c->out_table)
channel_aux_stop(c->out_table);
/* Stop import */
if (c->in_req.hook)
rt_stop_import(&c->in_req, channel_import_stopped);
c->gr_wait = 0;
if (c->gr_lock)
channel_graceful_restart_unlock(c);
CALL(c->channel->shutdown, c);
channel_roa_unsubscribe_all(c);
}
static void
channel_do_down(struct channel *c)
{
ASSERT(!c->out_req.hook && !c->in_req.hook && !c->out_table && !c->in_table);
c->proto->active_channels--;
// bmap_free(&c->export_map);
memset(&c->import_stats, 0, sizeof(struct channel_import_stats));
memset(&c->export_stats, 0, sizeof(struct channel_export_stats));
CALL(c->channel->cleanup, c);
/* This have to be done in here, as channel pool is freed before channel_do_down() */
bmap_free(&c->export_map);
bmap_free(&c->export_reject_map);
/* Schedule protocol shutddown */
if (proto_is_done(c->proto))
proto_send_event(c->proto);
}
void
channel_set_state(struct channel *c, uint state)
{
uint cs = c->channel_state;
DBG("%s reporting channel %s state transition %s -> %s\n", c->proto->name, c->name, c_states[cs], c_states[state]);
if (state == cs)
return;
c->channel_state = state;
c->last_state_change = current_time();
switch (state)
{
case CS_START:
ASSERT(cs == CS_DOWN || cs == CS_PAUSE);
if (cs == CS_DOWN)
channel_do_start(c);
break;
case CS_UP:
ASSERT(cs == CS_DOWN || cs == CS_START || cs == CS_PAUSE);
if (cs == CS_DOWN)
channel_do_start(c);
if (!c->gr_wait && c->proto->rt_notify)
channel_start_export(c);
channel_do_up(c);
break;
case CS_PAUSE:
ASSERT(cs == CS_UP);
if (cs == CS_UP)
channel_do_pause(c);
break;
case CS_STOP:
ASSERT(cs == CS_UP || cs == CS_START || cs == CS_PAUSE);
if (cs == CS_UP)
channel_do_pause(c);
channel_do_stop(c);
break;
case CS_DOWN:
ASSERT(cs == CS_STOP);
channel_do_down(c);
break;
default:
ASSERT(0);
}
channel_log_state_change(c);
}
/**
* channel_request_feeding - request feeding routes to the channel
* @c: given channel
*
* Sometimes it is needed to send again all routes to the channel. This is
* called feeding and can be requested by this function. This would cause
* channel export state transition to ES_FEEDING (during feeding) and when
* completed, it will switch back to ES_READY. This function can be called
* even when feeding is already running, in that case it is restarted.
*/
static void
channel_request_table_feeding(struct channel *c)
{
ASSERT(c->out_req.hook);
c->refeed_pending = 1;
rt_stop_export(&c->out_req, channel_export_stopped);
}
void
channel_request_feeding(struct channel *c)
{
if (c->gr_wait || !c->proto->rt_notify)
return;
CD(c, "Refeed requested");
ASSERT_DIE(c->out_req.hook);
if (c->out_table)
channel_aux_request_refeed(c->out_table);
else
channel_request_table_feeding(c);
}
void
channel_request_reload(struct channel *c)
{
ASSERT(c->in_req.hook);
ASSERT(channel_reloadable(c));
CD(c, "Reload requested");
if (c->in_table)
channel_aux_request_refeed(c->in_table);
else
c->proto->reload_routes(c);
}
void
channel_refresh_begin(struct channel *c)
{
CD(c, "Channel route refresh begin");
if (c->in_table)
rt_refresh_begin(&c->in_table->push);
else
rt_refresh_begin(&c->in_req);
}
void
channel_refresh_end(struct channel *c)
{
if (c->in_table)
rt_refresh_end(&c->in_table->push);
else
rt_refresh_end(&c->in_req);
}
const struct channel_class channel_basic = {
.channel_size = sizeof(struct channel),
.config_size = sizeof(struct channel_config)
};
void *
channel_config_new(const struct channel_class *cc, const char *name, uint net_type, struct proto_config *proto)
{
struct channel_config *cf = NULL;
struct rtable_config *tab = NULL;
if (net_type)
{
if (!net_val_match(net_type, proto->protocol->channel_mask))
cf_error("Unsupported channel type");
if (proto->net_type && (net_type != proto->net_type))
cf_error("Different channel type");
tab = new_config->def_tables[net_type];
}
if (!cc)
cc = &channel_basic;
cf = cfg_allocz(cc->config_size);
cf->name = name;
cf->channel = cc;
cf->parent = proto;
cf->table = tab;
cf->out_filter = FILTER_REJECT;
cf->net_type = net_type;
cf->ra_mode = RA_OPTIMAL;
cf->preference = proto->protocol->preference;
cf->debug = new_config->channel_default_debug;
cf->rpki_reload = 1;
add_tail(&proto->channels, &cf->n);
return cf;
}
void *
channel_config_get(const struct channel_class *cc, const char *name, uint net_type, struct proto_config *proto)
{
struct channel_config *cf;
/* We are using name as token, so no strcmp() */
WALK_LIST(cf, proto->channels)
if (cf->name == name)
{
/* Allow to redefine channel only if inherited from template */
if (cf->parent == proto)
cf_error("Multiple %s channels", name);
cf->parent = proto;
return cf;
}
return channel_config_new(cc, name, net_type, proto);
}
struct channel_config *
channel_copy_config(struct channel_config *src, struct proto_config *proto)
{
struct channel_config *dst = cfg_alloc(src->channel->config_size);
memcpy(dst, src, src->channel->config_size);
memset(&dst->n, 0, sizeof(node));
add_tail(&proto->channels, &dst->n);
CALL(src->channel->copy_config, dst, src);
return dst;
}
static int reconfigure_type; /* Hack to propagate type info to channel_reconfigure() */
int
channel_reconfigure(struct channel *c, struct channel_config *cf)
{
/* FIXME: better handle these changes, also handle in_keep_filtered */
if ((c->table != cf->table->table) || (cf->ra_mode && (c->ra_mode != cf->ra_mode)))
return 0;
/* Note that filter_same() requires arguments in (new, old) order */
int import_changed = !filter_same(cf->in_filter, c->in_filter);
int export_changed = !filter_same(cf->out_filter, c->out_filter);
int rpki_reload_changed = (cf->rpki_reload != c->rpki_reload);
if (c->preference != cf->preference)
import_changed = 1;
if (c->merge_limit != cf->merge_limit)
export_changed = 1;
/* Reconfigure channel fields */
c->in_filter = cf->in_filter;
c->out_filter = cf->out_filter;
channel_update_limit(c, &c->rx_limit, PLD_RX, &cf->rx_limit);
channel_update_limit(c, &c->in_limit, PLD_IN, &cf->in_limit);
channel_update_limit(c, &c->out_limit, PLD_OUT, &cf->out_limit);
// c->ra_mode = cf->ra_mode;
c->merge_limit = cf->merge_limit;
c->preference = cf->preference;
c->debug = cf->debug;
c->in_req.trace_routes = c->out_req.trace_routes = c->debug | c->proto->debug;
c->in_keep_filtered = cf->in_keep_filtered;
c->rpki_reload = cf->rpki_reload;
/* Execute channel-specific reconfigure hook */
if (c->channel->reconfigure && !c->channel->reconfigure(c, cf, &import_changed, &export_changed))
return 0;
/* If the channel is not open, it has no routes and we cannot reload it anyways */
if (c->channel_state != CS_UP)
goto done;
/* Update RPKI/ROA subscriptions */
if (import_changed || export_changed || rpki_reload_changed)
{
channel_roa_unsubscribe_all(c);
if (c->rpki_reload)
{
channel_roa_subscribe_filter(c, 1);
channel_roa_subscribe_filter(c, 0);
}
}
if (reconfigure_type == RECONFIG_SOFT)
{
if (import_changed)
log(L_INFO "Channel %s.%s changed import", c->proto->name, c->name);
if (export_changed)
log(L_INFO "Channel %s.%s changed export", c->proto->name, c->name);
goto done;
}
/* Route reload may be not supported */
if (import_changed && !channel_reloadable(c))
return 0;
if (import_changed || export_changed)
log(L_INFO "Reloading channel %s.%s", c->proto->name, c->name);
if (import_changed)
channel_request_reload(c);
if (export_changed)
channel_request_table_feeding(c);
done:
CD(c, "Reconfigured");
return 1;
}
int
proto_configure_channel(struct proto *p, struct channel **pc, struct channel_config *cf)
{
struct channel *c = *pc;
if (!c && cf)
{
/* We could add the channel, but currently it would just stay in down state
until protocol is restarted, so it is better to force restart anyways. */
if (p->proto_state != PS_DOWN)
{
log(L_INFO "Cannot add channel %s.%s", p->name, cf->name);
return 0;
}
*pc = proto_add_channel(p, cf);
}
else if (c && !cf)
{
if (c->channel_state != CS_DOWN)
{
log(L_INFO "Cannot remove channel %s.%s", c->proto->name, c->name);
return 0;
}
proto_remove_channel(p, c);
*pc = NULL;
}
else if (c && cf)
{
if (!channel_reconfigure(c, cf))
{
log(L_INFO "Cannot reconfigure channel %s.%s", c->proto->name, c->name);
return 0;
}
}
return 1;
}
static void
proto_cleanup(struct proto *p)
{
rfree(p->pool);
p->pool = NULL;
p->active = 0;
proto_log_state_change(p);
proto_rethink_goal(p);
}
static void
proto_loop_stopped(void *ptr)
{
struct proto *p = ptr;
birdloop_enter(&main_birdloop);
p->loop = &main_birdloop;
p->event->list = NULL;
proto_cleanup(p);
birdloop_leave(&main_birdloop);
}
static void
proto_event(void *ptr)
{
struct proto *p = ptr;
if (p->do_stop)
{
if (p->proto == &proto_unix_iface)
if_flush_ifaces(p);
p->do_stop = 0;
}
if (proto_is_done(p))
if (p->loop != &main_birdloop)
birdloop_stop_self(p->loop, proto_loop_stopped, p);
else
proto_cleanup(p);
}
/**
* proto_new - create a new protocol instance
* @c: protocol configuration
*
* When a new configuration has been read in, the core code starts
* initializing all the protocol instances configured by calling their
* init() hooks with the corresponding instance configuration. The initialization
* code of the protocol is expected to create a new instance according to the
* configuration by calling this function and then modifying the default settings
* to values wanted by the protocol.
*/
void *
proto_new(struct proto_config *cf)
{
struct proto *p = mb_allocz(proto_pool, cf->protocol->proto_size);
p->cf = cf;
p->debug = cf->debug;
p->mrtdump = cf->mrtdump;
p->name = cf->name;
p->proto = cf->protocol;
p->net_type = cf->net_type;
p->disabled = cf->disabled;
p->hash_key = random_u32();
cf->proto = p;
init_list(&p->channels);
return p;
}
static struct proto *
proto_init(struct proto_config *c, node *n)
{
struct protocol *pr = c->protocol;
struct proto *p = pr->init(c);
p->loop = &main_birdloop;
p->proto_state = PS_DOWN;
p->last_state_change = current_time();
p->vrf = c->vrf;
p->vrf_set = c->vrf_set;
insert_node(&p->n, n);
p->event = ev_new_init(proto_pool, proto_event, p);
PD(p, "Initializing%s", p->disabled ? " [disabled]" : "");
return p;
}
static void
proto_start(struct proto *p)
{
DBG("Kicking %s up\n", p->name);
PD(p, "Starting");
int ns = strlen("Protocol ") + strlen(p->cf->name) + 1;
void *nb = mb_alloc(proto_pool, ns);
ASSERT_DIE(ns - 1 == bsnprintf(nb, ns, "Protocol %s", p->cf->name));
p->pool = rp_new(proto_pool, nb);
if (graceful_restart_state == GRS_INIT)
p->gr_recovery = 1;
if (p->cf->loop_order != DOMAIN_ORDER(the_bird))
p->loop = birdloop_new(p->pool, p->cf->loop_order, nb);
p->event->list = proto_event_list(p);
mb_move(nb, p->pool);
PROTO_LOCKED_FROM_MAIN(p)
proto_notify_state(p, (p->proto->start ? p->proto->start(p) : PS_UP));
}
/**
* proto_config_new - create a new protocol configuration
* @pr: protocol the configuration will belong to
* @class: SYM_PROTO or SYM_TEMPLATE
*
* Whenever the configuration file says that a new instance
* of a routing protocol should be created, the parser calls
* proto_config_new() to create a configuration entry for this
* instance (a structure staring with the &proto_config header
* containing all the generic items followed by protocol-specific
* ones). Also, the configuration entry gets added to the list
* of protocol instances kept in the configuration.
*
* The function is also used to create protocol templates (when class
* SYM_TEMPLATE is specified), the only difference is that templates
* are not added to the list of protocol instances and therefore not
* initialized during protos_commit()).
*/
void *
proto_config_new(struct protocol *pr, int class)
{
struct proto_config *cf = cfg_allocz(pr->config_size);
if (class == SYM_PROTO)
add_tail(&new_config->protos, &cf->n);
cf->global = new_config;
cf->protocol = pr;
cf->name = pr->name;
cf->class = class;
cf->debug = new_config->proto_default_debug;
cf->mrtdump = new_config->proto_default_mrtdump;
cf->loop_order = DOMAIN_ORDER(the_bird);
init_list(&cf->channels);
return cf;
}
/**
* proto_copy_config - copy a protocol configuration
* @dest: destination protocol configuration
* @src: source protocol configuration
*
* Whenever a new instance of a routing protocol is created from the
* template, proto_copy_config() is called to copy a content of
* the source protocol configuration to the new protocol configuration.
* Name, class and a node in protos list of @dest are kept intact.
* copy_config() protocol hook is used to copy protocol-specific data.
*/
void
proto_copy_config(struct proto_config *dest, struct proto_config *src)
{
struct channel_config *cc;
node old_node;
int old_class;
const char *old_name;
if (dest->protocol != src->protocol)
cf_error("Can't copy configuration from a different protocol type");
if (dest->protocol->copy_config == NULL)
cf_error("Inheriting configuration for %s is not supported", src->protocol->name);
DBG("Copying configuration from %s to %s\n", src->name, dest->name);
/*
* Copy struct proto_config here. Keep original node, class and name.
* protocol-specific config copy is handled by protocol copy_config() hook
*/
old_node = dest->n;
old_class = dest->class;
old_name = dest->name;
memcpy(dest, src, src->protocol->config_size);
dest->n = old_node;
dest->class = old_class;
dest->name = old_name;
init_list(&dest->channels);
WALK_LIST(cc, src->channels)
channel_copy_config(cc, dest);
/* FIXME: allow for undefined copy_config */
dest->protocol->copy_config(dest, src);
}
void
proto_clone_config(struct symbol *sym, struct proto_config *parent)
{
struct proto_config *cf = proto_config_new(parent->protocol, SYM_PROTO);
proto_copy_config(cf, parent);
cf->name = sym->name;
cf->proto = NULL;
cf->parent = parent;
sym->class = cf->class;
sym->proto = cf;
}
static void
proto_undef_clone(struct symbol *sym, struct proto_config *cf)
{
rem_node(&cf->n);
sym->class = SYM_VOID;
sym->proto = NULL;
}
/**
* protos_preconfig - pre-configuration processing
* @c: new configuration
*
* This function calls the preconfig() hooks of all routing
* protocols available to prepare them for reading of the new
* configuration.
*/
void
protos_preconfig(struct config *c)
{
struct protocol *p;
init_list(&c->protos);
DBG("Protocol preconfig:");
WALK_LIST(p, protocol_list)
{
DBG(" %s", p->name);
p->name_counter = 0;
if (p->preconfig)
p->preconfig(p, c);
}
DBG("\n");
}
static int
proto_reconfigure(struct proto *p, struct proto_config *oc, struct proto_config *nc, int type)
{
/* If the protocol is DOWN, we just restart it */
if (p->proto_state == PS_DOWN)
return 0;
/* If there is a too big change in core attributes, ... */
if ((nc->protocol != oc->protocol) ||
(nc->net_type != oc->net_type) ||
(nc->disabled != p->disabled) ||
(nc->vrf != oc->vrf) ||
(nc->vrf_set != oc->vrf_set))
return 0;
p->name = nc->name;
p->debug = nc->debug;
p->mrtdump = nc->mrtdump;
reconfigure_type = type;
/* Execute protocol specific reconfigure hook */
if (!p->proto->reconfigure || !p->proto->reconfigure(p, nc))
return 0;
DBG("\t%s: same\n", oc->name);
PD(p, "Reconfigured");
p->cf = nc;
return 1;
}
/**
* protos_commit - commit new protocol configuration
* @new: new configuration
* @old: old configuration or %NULL if it's boot time config
* @force_reconfig: force restart of all protocols (used for example
* when the router ID changes)
* @type: type of reconfiguration (RECONFIG_SOFT or RECONFIG_HARD)
*
* Scan differences between @old and @new configuration and adjust all
* protocol instances to conform to the new configuration.
*
* When a protocol exists in the new configuration, but it doesn't in the
* original one, it's immediately started. When a collision with the other
* running protocol would arise, the new protocol will be temporarily stopped
* by the locking mechanism.
*
* When a protocol exists in the old configuration, but it doesn't in the
* new one, it's shut down and deleted after the shutdown completes.
*
* When a protocol exists in both configurations, the core decides
* whether it's possible to reconfigure it dynamically - it checks all
* the core properties of the protocol (changes in filters are ignored
* if type is RECONFIG_SOFT) and if they match, it asks the
* reconfigure() hook of the protocol to see if the protocol is able
* to switch to the new configuration. If it isn't possible, the
* protocol is shut down and a new instance is started with the new
* configuration after the shutdown is completed.
*/
void
protos_commit(struct config *new, struct config *old, int force_reconfig, int type)
{
struct proto_config *oc, *nc;
struct symbol *sym;
struct proto *p;
node *n;
DBG("protos_commit:\n");
if (old)
{
WALK_LIST(oc, old->protos)
{
p = oc->proto;
sym = cf_find_symbol(new, oc->name);
/* Handle dynamic protocols */
if (!sym && oc->parent && !new->shutdown)
{
struct symbol *parsym = cf_find_symbol(new, oc->parent->name);
if (parsym && parsym->class == SYM_PROTO)
{
/* This is hack, we would like to share config, but we need to copy it now */
new_config = new;
cfg_mem = new->mem;
conf_this_scope = new->root_scope;
sym = cf_get_symbol(oc->name);
proto_clone_config(sym, parsym->proto);
new_config = NULL;
cfg_mem = NULL;
}
}
if (sym && sym->class == SYM_PROTO && !new->shutdown)
{
/* Found match, let's check if we can smoothly switch to new configuration */
/* No need to check description */
nc = sym->proto;
nc->proto = p;
/* We will try to reconfigure protocol p */
if (! force_reconfig && proto_reconfigure(p, oc, nc, type))
continue;
if (nc->parent)
{
proto_undef_clone(sym, nc);
goto remove;
}
/* Unsuccessful, we will restart it */
if (!p->disabled && !nc->disabled)
log(L_INFO "Restarting protocol %s", p->name);
else if (p->disabled && !nc->disabled)
log(L_INFO "Enabling protocol %s", p->name);
else if (!p->disabled && nc->disabled)
log(L_INFO "Disabling protocol %s", p->name);
p->down_code = nc->disabled ? PDC_CF_DISABLE : PDC_CF_RESTART;
p->cf_new = nc;
}
else if (!new->shutdown)
{
remove:
log(L_INFO "Removing protocol %s", p->name);
p->down_code = PDC_CF_REMOVE;
p->cf_new = NULL;
}
else if (new->gr_down)
{
p->down_code = PDC_CMD_GR_DOWN;
p->cf_new = NULL;
}
else /* global shutdown */
{
p->down_code = PDC_CMD_SHUTDOWN;
p->cf_new = NULL;
}
p->reconfiguring = 1;
config_add_obstacle(old);
proto_rethink_goal(p);
}
}
struct proto *first_dev_proto = NULL;
n = NODE &(proto_list.head);
WALK_LIST(nc, new->protos)
if (!nc->proto)
{
/* Not a first-time configuration */
if (old)
log(L_INFO "Adding protocol %s", nc->name);
p = proto_init(nc, n);
n = NODE p;
if (p->proto == &proto_unix_iface)
first_dev_proto = p;
}
else
n = NODE nc->proto;
DBG("Protocol start\n");
/* Start device protocol first */
if (first_dev_proto)
proto_rethink_goal(first_dev_proto);
/* Determine router ID for the first time - it has to be here and not in
global_commit() because it is postponed after start of device protocol */
if (!config->router_id)
{
config->router_id = if_choose_router_id(config->router_id_from, 0);
if (!config->router_id)
die("Cannot determine router ID, please configure it manually");
}
/* Start all new protocols */
WALK_LIST_DELSAFE(p, n, proto_list)
proto_rethink_goal(p);
}
static void
proto_shutdown(struct proto *p)
{
if (p->proto_state == PS_START || p->proto_state == PS_UP)
{
/* Going down */
DBG("Kicking %s down\n", p->name);
PD(p, "Shutting down");
proto_notify_state(p, (p->proto->shutdown ? p->proto->shutdown(p) : PS_DOWN));
}
}
static void
proto_rethink_goal(struct proto *p)
{
if (p->reconfiguring && !p->active)
{
struct proto_config *nc = p->cf_new;
node *n = p->n.prev;
DBG("%s has shut down for reconfiguration\n", p->name);
p->cf->proto = NULL;
config_del_obstacle(p->cf->global);
proto_remove_channels(p);
rem_node(&p->n);
rfree(p->event);
mb_free(p->message);
mb_free(p);
if (!nc)
return;
p = proto_init(nc, n);
}
/* Determine what state we want to reach */
if (p->disabled || p->reconfiguring)
{
PROTO_LOCKED_FROM_MAIN(p)
proto_shutdown(p);
}
else if (!p->active)
proto_start(p);
}
struct proto *
proto_spawn(struct proto_config *cf, uint disabled)
{
struct proto *p = proto_init(cf, TAIL(proto_list));
p->disabled = disabled;
proto_rethink_goal(p);
return p;
}
/**
* DOC: Graceful restart recovery
*
* Graceful restart of a router is a process when the routing plane (e.g. BIRD)
* restarts but both the forwarding plane (e.g kernel routing table) and routing
* neighbors keep proper routes, and therefore uninterrupted packet forwarding
* is maintained.
*
* BIRD implements graceful restart recovery by deferring export of routes to
* protocols until routing tables are refilled with the expected content. After
* start, protocols generate routes as usual, but routes are not propagated to
* them, until protocols report that they generated all routes. After that,
* graceful restart recovery is finished and the export (and the initial feed)
* to protocols is enabled.
*
* When graceful restart recovery need is detected during initialization, then
* enabled protocols are marked with @gr_recovery flag before start. Such
* protocols then decide how to proceed with graceful restart, participation is
* voluntary. Protocols could lock the recovery for each channel by function
* channel_graceful_restart_lock() (state stored in @gr_lock flag), which means
* that they want to postpone the end of the recovery until they converge and
* then unlock it. They also could set @gr_wait before advancing to %PS_UP,
* which means that the core should defer route export to that channel until
* the end of the recovery. This should be done by protocols that expect their
* neigbors to keep the proper routes (kernel table, BGP sessions with BGP
* graceful restart capability).
*
* The graceful restart recovery is finished when either all graceful restart
* locks are unlocked or when graceful restart wait timer fires.
*
*/
static void graceful_restart_done(timer *t);
/**
* graceful_restart_recovery - request initial graceful restart recovery
*
* Called by the platform initialization code if the need for recovery
* after graceful restart is detected during boot. Have to be called
* before protos_commit().
*/
void
graceful_restart_recovery(void)
{
graceful_restart_state = GRS_INIT;
}
/**
* graceful_restart_init - initialize graceful restart
*
* When graceful restart recovery was requested, the function starts an active
* phase of the recovery and initializes graceful restart wait timer. The
* function have to be called after protos_commit().
*/
void
graceful_restart_init(void)
{
if (!graceful_restart_state)
return;
log(L_INFO "Graceful restart started");
if (!graceful_restart_locks)
{
graceful_restart_done(NULL);
return;
}
graceful_restart_state = GRS_ACTIVE;
gr_wait_timer = tm_new_init(proto_pool, graceful_restart_done, NULL, 0, 0);
tm_start(gr_wait_timer, config->gr_wait S);
}
/**
* graceful_restart_done - finalize graceful restart
* @t: unused
*
* When there are no locks on graceful restart, the functions finalizes the
* graceful restart recovery. Protocols postponing route export until the end of
* the recovery are awakened and the export to them is enabled. All other
* related state is cleared. The function is also called when the graceful
* restart wait timer fires (but there are still some locks).
*/
static void
graceful_restart_done(timer *t UNUSED)
{
log(L_INFO "Graceful restart done");
graceful_restart_state = GRS_DONE;
struct proto *p;
WALK_LIST(p, proto_list)
{
if (!p->gr_recovery)
continue;
struct channel *c;
WALK_LIST(c, p->channels)
{
/* Resume postponed export of routes */
if ((c->channel_state == CS_UP) && c->gr_wait && p->rt_notify)
channel_start_export(c);
/* Cleanup */
c->gr_wait = 0;
c->gr_lock = 0;
}
p->gr_recovery = 0;
}
graceful_restart_locks = 0;
}
void
graceful_restart_show_status(void)
{
if (graceful_restart_state != GRS_ACTIVE)
return;
cli_msg(-24, "Graceful restart recovery in progress");
cli_msg(-24, " Waiting for %d channels to recover", graceful_restart_locks);
cli_msg(-24, " Wait timer is %t/%u", tm_remains(gr_wait_timer), config->gr_wait);
}
/**
* channel_graceful_restart_lock - lock graceful restart by channel
* @p: channel instance
*
* This function allows a protocol to postpone the end of graceful restart
* recovery until it converges. The lock is removed when the protocol calls
* channel_graceful_restart_unlock() or when the channel is closed.
*
* The function have to be called during the initial phase of graceful restart
* recovery and only for protocols that are part of graceful restart (i.e. their
* @gr_recovery is set), which means it should be called from protocol start
* hooks.
*/
void
channel_graceful_restart_lock(struct channel *c)
{
ASSERT(graceful_restart_state == GRS_INIT);
ASSERT(c->proto->gr_recovery);
if (c->gr_lock)
return;
c->gr_lock = 1;
graceful_restart_locks++;
}
/**
* channel_graceful_restart_unlock - unlock graceful restart by channel
* @p: channel instance
*
* This function unlocks a lock from channel_graceful_restart_lock(). It is also
* automatically called when the lock holding protocol went down.
*/
void
channel_graceful_restart_unlock(struct channel *c)
{
if (!c->gr_lock)
return;
c->gr_lock = 0;
graceful_restart_locks--;
if ((graceful_restart_state == GRS_ACTIVE) && !graceful_restart_locks)
tm_start(gr_wait_timer, 0);
}
/**
* protos_dump_all - dump status of all protocols
*
* This function dumps status of all existing protocol instances to the
* debug output. It involves printing of general status information
* such as protocol states, its position on the protocol lists
* and also calling of a dump() hook of the protocol to print
* the internals.
*/
void
protos_dump_all(void)
{
debug("Protocols:\n");
struct proto *p;
WALK_LIST(p, proto_list)
{
#define DPF(x) (p->x ? " " #x : "")
debug(" protocol %s (%p) state %s with %d active channels flags: %s%s%s%s\n",
p->name, p, p_states[p->proto_state], p->active_channels,
DPF(disabled), DPF(active), DPF(do_stop), DPF(reconfiguring));
#undef DPF
struct channel *c;
WALK_LIST(c, p->channels)
{
debug("\tTABLE %s\n", c->table->name);
if (c->in_filter)
debug("\tInput filter: %s\n", filter_name(c->in_filter));
if (c->out_filter)
debug("\tOutput filter: %s\n", filter_name(c->out_filter));
debug("\tChannel state: %s/%s/%s\n", c_states[c->channel_state],
c->in_req.hook ? rt_import_state_name(rt_import_get_state(c->in_req.hook)) : "-",
c->out_req.hook ? rt_export_state_name(rt_export_get_state(c->out_req.hook)) : "-");
if (c->in_table)
{
debug("\tInput aux table:\n");
rt_dump_hooks(c->in_table->tab);
rt_dump(c->in_table->tab);
debug("\tEnd of input aux table.\n");
}
if (c->out_table)
{
debug("\tOutput aux table:\n");
rt_dump_hooks(c->in_table->tab);
rt_dump(c->in_table->tab);
debug("\tEnd of output aux table.\n");
}
}
if (p->proto->dump && (p->proto_state != PS_DOWN))
p->proto->dump(p);
}
}
/**
* proto_build - make a single protocol available
* @p: the protocol
*
* After the platform specific initialization code uses protos_build()
* to add all the standard protocols, it should call proto_build() for
* all platform specific protocols to inform the core that they exist.
*/
void
proto_build(struct protocol *p)
{
add_tail(&protocol_list, &p->n);
ASSERT(p->class);
ASSERT(!class_to_protocol[p->class]);
class_to_protocol[p->class] = p;
}
/* FIXME: convert this call to some protocol hook */
extern void bfd_init_all(void);
/**
* protos_build - build a protocol list
*
* This function is called during BIRD startup to insert
* all standard protocols to the global protocol list. Insertion
* of platform specific protocols (such as the kernel syncer)
* is in the domain of competence of the platform dependent
* startup code.
*/
void
protos_build(void)
{
init_list(&proto_list);
init_list(&protocol_list);
proto_build(&proto_device);
#ifdef CONFIG_RADV
proto_build(&proto_radv);
#endif
#ifdef CONFIG_RIP
proto_build(&proto_rip);
#endif
#ifdef CONFIG_STATIC
proto_build(&proto_static);
#endif
#ifdef CONFIG_MRT
proto_build(&proto_mrt);
#endif
#ifdef CONFIG_OSPF
proto_build(&proto_ospf);
#endif
#ifdef CONFIG_PIPE
proto_build(&proto_pipe);
#endif
#ifdef CONFIG_BGP
proto_build(&proto_bgp);
#endif
#ifdef CONFIG_BFD
proto_build(&proto_bfd);
bfd_init_all();
#endif
#ifdef CONFIG_BABEL
proto_build(&proto_babel);
#endif
#ifdef CONFIG_RPKI
proto_build(&proto_rpki);
#endif
#ifdef CONFIG_PERF
proto_build(&proto_perf);
#endif
proto_pool = rp_new(&root_pool, "Protocols");
proto_shutdown_timer = tm_new(proto_pool);
proto_shutdown_timer->hook = proto_shutdown_loop;
}
/* Temporary hack to propagate restart to BGP */
int proto_restart;
static void
proto_shutdown_loop(timer *t UNUSED)
{
struct proto *p, *p_next;
WALK_LIST_DELSAFE(p, p_next, proto_list)
if (p->down_sched)
{
proto_restart = (p->down_sched == PDS_RESTART);
p->disabled = 1;
proto_rethink_goal(p);
if (proto_restart)
{
p->disabled = 0;
proto_rethink_goal(p);
}
}
}
static inline void
proto_schedule_down(struct proto *p, byte restart, byte code)
{
/* Does not work for other states (even PS_START) */
ASSERT(p->proto_state == PS_UP);
/* Scheduled restart may change to shutdown, but not otherwise */
if (p->down_sched == PDS_DISABLE)
return;
p->down_sched = restart ? PDS_RESTART : PDS_DISABLE;
p->down_code = code;
tm_start_max(proto_shutdown_timer, restart ? 250 MS : 0);
}
/**
* proto_set_message - set administrative message to protocol
* @p: protocol
* @msg: message
* @len: message length (-1 for NULL-terminated string)
*
* The function sets administrative message (string) related to protocol state
* change. It is called by the nest code for manual enable/disable/restart
* commands all routes to the protocol, and by protocol-specific code when the
* protocol state change is initiated by the protocol. Using NULL message clears
* the last message. The message string may be either NULL-terminated or with an
* explicit length.
*/
void
proto_set_message(struct proto *p, char *msg, int len)
{
mb_free(p->message);
p->message = NULL;
if (!msg || !len)
return;
if (len < 0)
len = strlen(msg);
if (!len)
return;
p->message = mb_alloc(proto_pool, len + 1);
memcpy(p->message, msg, len);
p->message[len] = 0;
}
static const char * channel_limit_name[] = {
[PLA_WARN] = "warn",
[PLA_BLOCK] = "block",
[PLA_RESTART] = "restart",
[PLA_DISABLE] = "disable",
};
static void
channel_log_limit(struct channel *c, struct limit *l, int dir)
{
const char *dir_name[PLD_MAX] = { "receive", "import" , "export" };
log(L_WARN "Channel %s.%s hits route %s limit (%d), action: %s",
c->proto->name, c->name, dir_name[dir], l->max, channel_limit_name[c->limit_actions[dir]]);
}
static void
channel_activate_limit(struct channel *c, struct limit *l, int dir)
{
if (c->limit_active & (1 << dir))
return;
c->limit_active |= (1 << dir);
channel_log_limit(c, l, dir);
}
static int
channel_limit_warn(struct limit *l, void *data)
{
struct channel_limit_data *cld = data;
struct channel *c = cld->c;
int dir = cld->dir;
channel_log_limit(c, l, dir);
return 0;
}
static int
channel_limit_block(struct limit *l, void *data)
{
struct channel_limit_data *cld = data;
struct channel *c = cld->c;
int dir = cld->dir;
channel_activate_limit(c, l, dir);
return 1;
}
static const byte chl_dir_down[PLD_MAX] = { PDC_RX_LIMIT_HIT, PDC_IN_LIMIT_HIT, PDC_OUT_LIMIT_HIT };
static int
channel_limit_down(struct limit *l, void *data)
{
struct channel_limit_data *cld = data;
struct channel *c = cld->c;
struct proto *p = c->proto;
int dir = cld->dir;
channel_activate_limit(c, l, dir);
if (p->proto_state == PS_UP)
proto_schedule_down(p, c->limit_actions[dir] == PLA_RESTART, chl_dir_down[dir]);
return 1;
}
static int (*channel_limit_action[])(struct limit *, void *) = {
[PLA_NONE] = NULL,
[PLA_WARN] = channel_limit_warn,
[PLA_BLOCK] = channel_limit_block,
[PLA_RESTART] = channel_limit_down,
[PLA_DISABLE] = channel_limit_down,
};
static void
channel_update_limit(struct channel *c, struct limit *l, int dir, struct channel_limit *cf)
{
l->action = channel_limit_action[cf->action];
c->limit_actions[dir] = cf->action;
struct channel_limit_data cld = { .c = c, .dir = dir };
limit_update(l, &cld, cf->action ? cf->limit : ~((u32) 0));
}
static void
channel_init_limit(struct channel *c, struct limit *l, int dir, struct channel_limit *cf)
{
channel_reset_limit(c, l, dir);
channel_update_limit(c, l, dir, cf);
}
static void
channel_reset_limit(struct channel *c, struct limit *l, int dir)
{
limit_reset(l);
c->limit_active &= ~(1 << dir);
}
static struct rte_owner_class default_rte_owner_class;
static inline void
proto_do_start(struct proto *p)
{
p->active = 1;
rt_init_sources(&p->sources, p->name, proto_event_list(p));
if (!p->sources.class)
p->sources.class = &default_rte_owner_class;
if (!p->cf->late_if_feed)
if_feed_baby(p);
}
static void
proto_do_up(struct proto *p)
{
if (!p->main_source)
p->main_source = rt_get_source(p, 0);
// Locked automaticaly
proto_start_channels(p);
if (p->cf->late_if_feed)
if_feed_baby(p);
}
static inline void
proto_do_pause(struct proto *p)
{
proto_pause_channels(p);
}
static void
proto_do_stop(struct proto *p)
{
p->down_sched = 0;
p->gr_recovery = 0;
if (p->main_source)
{
rt_unlock_source(p->main_source);
p->main_source = NULL;
}
proto_stop_channels(p);
rt_destroy_sources(&p->sources, p->event);
p->do_stop = 1;
proto_send_event(p);
}
static void
proto_do_down(struct proto *p)
{
p->down_code = 0;
neigh_prune();
/* Shutdown is finished in the protocol event */
if (proto_is_done(p))
proto_send_event(p);
}
/**
* proto_notify_state - notify core about protocol state change
* @p: protocol the state of which has changed
* @ps: the new status
*
* Whenever a state of a protocol changes due to some event internal
* to the protocol (i.e., not inside a start() or shutdown() hook),
* it should immediately notify the core about the change by calling
* proto_notify_state() which will write the new state to the &proto
* structure and take all the actions necessary to adapt to the new
* state. State change to PS_DOWN immediately frees resources of protocol
* and might execute start callback of protocol; therefore,
* it should be used at tail positions of protocol callbacks.
*/
void
proto_notify_state(struct proto *p, uint state)
{
uint ps = p->proto_state;
DBG("%s reporting state transition %s -> %s\n", p->name, p_states[ps], p_states[state]);
if (state == ps)
return;
p->proto_state = state;
p->last_state_change = current_time();
switch (state)
{
case PS_START:
ASSERT(ps == PS_DOWN || ps == PS_UP);
if (ps == PS_DOWN)
proto_do_start(p);
else
proto_do_pause(p);
break;
case PS_UP:
ASSERT(ps == PS_DOWN || ps == PS_START);
if (ps == PS_DOWN)
proto_do_start(p);
proto_do_up(p);
break;
case PS_STOP:
ASSERT(ps == PS_START || ps == PS_UP);
proto_do_stop(p);
break;
case PS_DOWN:
if (ps != PS_STOP)
proto_do_stop(p);
proto_do_down(p);
break;
default:
bug("%s: Invalid state %d", p->name, ps);
}
proto_log_state_change(p);
}
/*
* CLI Commands
*/
static char *
proto_state_name(struct proto *p)
{
switch (p->proto_state)
{
case PS_DOWN: return p->active ? "flush" : "down";
case PS_START: return "start";
case PS_UP: return "up";
case PS_STOP: return "stop";
default: return "???";
}
}
static void
channel_show_stats(struct channel *c)
{
struct channel_import_stats *ch_is = &c->import_stats;
struct channel_export_stats *ch_es = &c->export_stats;
struct rt_import_stats *rt_is = c->in_req.hook ? &c->in_req.hook->stats : NULL;
struct rt_export_stats *rt_es = c->out_req.hook ? &c->out_req.hook->stats : NULL;
#define SON(ie, item) ((ie) ? (ie)->item : 0)
#define SCI(item) SON(ch_is, item)
#define SCE(item) SON(ch_es, item)
#define SRI(item) SON(rt_is, item)
#define SRE(item) SON(rt_es, item)
u32 rx_routes = c->rx_limit.count;
u32 in_routes = c->in_limit.count;
u32 out_routes = c->out_limit.count;
if (c->in_keep_filtered)
cli_msg(-1006, " Routes: %u imported, %u filtered, %u exported, %u preferred",
in_routes, (rx_routes - in_routes), out_routes, SRI(pref));
else
cli_msg(-1006, " Routes: %u imported, %u exported, %u preferred",
in_routes, out_routes, SRI(pref));
cli_msg(-1006, " Route change stats: received rejected filtered ignored limited accepted");
cli_msg(-1006, " Import updates: %10u %10u %10u %10u %10u %10u",
SCI(updates_received), SCI(updates_invalid),
SCI(updates_filtered), SRI(updates_ignored),
SCI(updates_limited_rx) + SCI(updates_limited_in),
SRI(updates_accepted));
cli_msg(-1006, " Import withdraws: %10u %10u --- %10u --- %10u",
SCI(withdraws_received), SCI(withdraws_invalid),
SRI(withdraws_ignored), SRI(withdraws_accepted));
cli_msg(-1006, " Export updates: %10u %10u %10u --- %10u %10u",
SRE(updates_received), SCE(updates_rejected),
SCE(updates_filtered), SCE(updates_limited), SCE(updates_accepted));
cli_msg(-1006, " Export withdraws: %10u --- --- --- ---%10u",
SRE(withdraws_received), SCE(withdraws_accepted));
#undef SRI
#undef SRE
#undef SCI
#undef SCE
#undef SON
}
void
channel_show_limit(struct limit *l, const char *dsc, int active, int action)
{
if (!l->action)
return;
cli_msg(-1006, " %-16s%d%s", dsc, l->max, active ? " [HIT]" : "");
cli_msg(-1006, " Action: %s", channel_limit_name[action]);
}
void
channel_show_info(struct channel *c)
{
cli_msg(-1006, " Channel %s", c->name);
cli_msg(-1006, " State: %s", c_states[c->channel_state]);
cli_msg(-1006, " Import state: %s", rt_import_state_name(rt_import_get_state(c->in_req.hook)));
cli_msg(-1006, " Export state: %s", rt_export_state_name(rt_export_get_state(c->out_req.hook)));
cli_msg(-1006, " Table: %s", c->table->name);
cli_msg(-1006, " Preference: %d", c->preference);
cli_msg(-1006, " Input filter: %s", filter_name(c->in_filter));
cli_msg(-1006, " Output filter: %s", filter_name(c->out_filter));
if (graceful_restart_state == GRS_ACTIVE)
cli_msg(-1006, " GR recovery: %s%s",
c->gr_lock ? " pending" : "",
c->gr_wait ? " waiting" : "");
channel_show_limit(&c->rx_limit, "Receive limit:", c->limit_active & (1 << PLD_RX), c->limit_actions[PLD_RX]);
channel_show_limit(&c->in_limit, "Import limit:", c->limit_active & (1 << PLD_IN), c->limit_actions[PLD_IN]);
channel_show_limit(&c->out_limit, "Export limit:", c->limit_active & (1 << PLD_OUT), c->limit_actions[PLD_OUT]);
if (c->channel_state != CS_DOWN)
channel_show_stats(c);
}
void
channel_cmd_debug(struct channel *c, uint mask)
{
if (cli_access_restricted())
return;
c->debug = mask;
cli_msg(0, "");
}
void
proto_cmd_show(struct proto *p, uintptr_t verbose, int cnt)
{
byte buf[256], tbuf[TM_DATETIME_BUFFER_SIZE];
/* First protocol - show header */
if (!cnt)
cli_msg(-2002, "%-10s %-10s %-10s %-6s %-12s %s",
"Name", "Proto", "Table", "State", "Since", "Info");
buf[0] = 0;
if (p->proto->get_status)
p->proto->get_status(p, buf);
tm_format_time(tbuf, &config->tf_proto, p->last_state_change);
cli_msg(-1002, "%-10s %-10s %-10s %-6s %-12s %s",
p->name,
p->proto->name,
p->main_channel ? p->main_channel->table->name : "---",
proto_state_name(p),
tbuf,
buf);
if (verbose)
{
if (p->cf->dsc)
cli_msg(-1006, " Description: %s", p->cf->dsc);
if (p->message)
cli_msg(-1006, " Message: %s", p->message);
if (p->cf->router_id)
cli_msg(-1006, " Router ID: %R", p->cf->router_id);
if (p->vrf_set)
cli_msg(-1006, " VRF: %s", p->vrf ? p->vrf->name : "default");
if (p->proto->show_proto_info)
p->proto->show_proto_info(p);
else
{
struct channel *c;
WALK_LIST(c, p->channels)
channel_show_info(c);
}
cli_msg(-1006, "");
}
}
void
proto_cmd_disable(struct proto *p, uintptr_t arg, int cnt UNUSED)
{
if (p->disabled)
{
cli_msg(-8, "%s: already disabled", p->name);
return;
}
log(L_INFO "Disabling protocol %s", p->name);
p->disabled = 1;
p->down_code = PDC_CMD_DISABLE;
proto_set_message(p, (char *) arg, -1);
proto_shutdown(p);
cli_msg(-9, "%s: disabled", p->name);
}
void
proto_cmd_enable(struct proto *p, uintptr_t arg, int cnt UNUSED)
{
if (!p->disabled)
{
cli_msg(-10, "%s: already enabled", p->name);
return;
}
log(L_INFO "Enabling protocol %s", p->name);
p->disabled = 0;
proto_set_message(p, (char *) arg, -1);
proto_rethink_goal(p);
cli_msg(-11, "%s: enabled", p->name);
}
void
proto_cmd_restart(struct proto *p, uintptr_t arg, int cnt UNUSED)
{
if (p->disabled)
{
cli_msg(-8, "%s: already disabled", p->name);
return;
}
log(L_INFO "Restarting protocol %s", p->name);
p->disabled = 1;
p->down_code = PDC_CMD_RESTART;
proto_set_message(p, (char *) arg, -1);
proto_shutdown(p);
p->disabled = 0;
/* After the protocol shuts down, proto_rethink_goal() is run from proto_event. */
cli_msg(-12, "%s: restarted", p->name);
}
void
proto_cmd_reload(struct proto *p, uintptr_t dir, int cnt UNUSED)
{
struct channel *c;
if (p->disabled)
{
cli_msg(-8, "%s: already disabled", p->name);
return;
}
/* If the protocol in not UP, it has no routes */
if (p->proto_state != PS_UP)
return;
/* All channels must support reload */
if (dir != CMD_RELOAD_OUT)
WALK_LIST(c, p->channels)
if ((c->channel_state == CS_UP) && !channel_reloadable(c))
{
cli_msg(-8006, "%s: reload failed", p->name);
return;
}
log(L_INFO "Reloading protocol %s", p->name);
/* re-importing routes */
if (dir != CMD_RELOAD_OUT)
WALK_LIST(c, p->channels)
if (c->channel_state == CS_UP)
channel_request_reload(c);
/* re-exporting routes */
if (dir != CMD_RELOAD_IN)
WALK_LIST(c, p->channels)
if (c->channel_state == CS_UP)
channel_request_feeding(c);
cli_msg(-15, "%s: reloading", p->name);
}
extern void pipe_update_debug(struct proto *P);
void
proto_cmd_debug(struct proto *p, uintptr_t mask, int cnt UNUSED)
{
p->debug = mask;
#ifdef CONFIG_PIPE
if (p->proto == &proto_pipe)
pipe_update_debug(p);
#endif
}
void
proto_cmd_mrtdump(struct proto *p, uintptr_t mask, int cnt UNUSED)
{
p->mrtdump = mask;
}
static void
proto_apply_cmd_symbol(const struct symbol *s, void (* cmd)(struct proto *, uintptr_t, int), uintptr_t arg)
{
if (s->class != SYM_PROTO)
{
cli_msg(9002, "%s is not a protocol", s->name);
return;
}
if (s->proto->proto)
{
struct proto *p = s->proto->proto;
PROTO_LOCKED_FROM_MAIN(p)
cmd(p, arg, 0);
cli_msg(0, "");
}
else
cli_msg(9002, "%s does not exist", s->name);
}
static void
proto_apply_cmd_patt(const char *patt, void (* cmd)(struct proto *, uintptr_t, int), uintptr_t arg)
{
struct proto *p;
int cnt = 0;
WALK_LIST(p, proto_list)
if (!patt || patmatch(patt, p->name))
PROTO_LOCKED_FROM_MAIN(p)
cmd(p, arg, cnt++);
if (!cnt)
cli_msg(8003, "No protocols match");
else
cli_msg(0, "");
}
void
proto_apply_cmd(struct proto_spec ps, void (* cmd)(struct proto *, uintptr_t, int),
int restricted, uintptr_t arg)
{
if (restricted && cli_access_restricted())
return;
if (ps.patt)
proto_apply_cmd_patt(ps.ptr, cmd, arg);
else
proto_apply_cmd_symbol(ps.ptr, cmd, arg);
}
struct proto *
proto_get_named(struct symbol *sym, struct protocol *pr)
{
struct proto *p, *q;
if (sym)
{
if (sym->class != SYM_PROTO)
cf_error("%s: Not a protocol", sym->name);
p = sym->proto->proto;
if (!p || p->proto != pr)
cf_error("%s: Not a %s protocol", sym->name, pr->name);
}
else
{
p = NULL;
WALK_LIST(q, proto_list)
if ((q->proto == pr) && (q->proto_state != PS_DOWN))
{
if (p)
cf_error("There are multiple %s protocols running", pr->name);
p = q;
}
if (!p)
cf_error("There is no %s protocol running", pr->name);
}
return p;
}
struct proto *
proto_iterate_named(struct symbol *sym, struct protocol *proto, struct proto *old)
{
if (sym)
{
/* Just the first pass */
if (old)
{
cli_msg(0, "");
return NULL;
}
if (sym->class != SYM_PROTO)
cf_error("%s: Not a protocol", sym->name);
struct proto *p = sym->proto->proto;
if (!p || (p->proto != proto))
cf_error("%s: Not a %s protocol", sym->name, proto->name);
return p;
}
else
{
for (struct proto *p = !old ? HEAD(proto_list) : NODE_NEXT(old);
NODE_VALID(p);
p = NODE_NEXT(p))
{
if ((p->proto == proto) && (p->proto_state != PS_DOWN))
{
cli_separator(this_cli);
return p;
}
}
/* Not found anything during first pass */
if (!old)
cf_error("There is no %s protocol running", proto->name);
/* No more items */
cli_msg(0, "");
return NULL;
}
}
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