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Nest: Use bitmaps to keep track of exported routes

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Use a hierarchical bitmap in a routing table to assign ids to routes, and
then use bitmaps (indexed by route id) in channels to keep track whether
routes were exported. This avoids unreliable and inefficient re-evaluation
of filters for old routes in order to determine whether they were exported.
This commit is contained in:
Ondrej Zajicek (work) 2019-09-09 02:55:32 +02:00
parent af02b83b88
commit 5ea39eaa96
9 changed files with 256 additions and 329 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
lib/bitmap.c
View File

@ -26,6 +26,13 @@ bmap_init(struct bmap *b, pool *p, uint size)
b->data = mb_allocz(p, b->size); b->data = mb_allocz(p, b->size);
} }
void
bmap_reset(struct bmap *b, uint size)
{
b->size = BIRD_ALIGN(size, 4);
memset(b->data, 0, b->size);
}
void void
bmap_grow(struct bmap *b, uint need) bmap_grow(struct bmap *b, uint need)
{ {

1
lib/bitmap.h
View File

@ -17,6 +17,7 @@ struct bmap
}; };
void bmap_init(struct bmap *b, pool *p, uint size); void bmap_init(struct bmap *b, pool *p, uint size);
void bmap_reset(struct bmap *b, uint size);
void bmap_grow(struct bmap *b, uint need); void bmap_grow(struct bmap *b, uint need);
void bmap_free(struct bmap *b); void bmap_free(struct bmap *b);

3
nest/config.Y
View File

@ -70,7 +70,7 @@ CF_KEYWORDS(IPV4, IPV6, VPN4, VPN6, ROA4, ROA6, FLOW4, FLOW6, SADR, MPLS)
CF_KEYWORDS(RECEIVE, LIMIT, ACTION, WARN, BLOCK, RESTART, DISABLE, KEEP, FILTERED) CF_KEYWORDS(RECEIVE, LIMIT, ACTION, WARN, BLOCK, RESTART, DISABLE, KEEP, FILTERED)
CF_KEYWORDS(PASSWORD, FROM, PASSIVE, TO, ID, EVENTS, PACKETS, PROTOCOLS, INTERFACES) CF_KEYWORDS(PASSWORD, FROM, PASSIVE, TO, ID, EVENTS, PACKETS, PROTOCOLS, INTERFACES)
CF_KEYWORDS(ALGORITHM, KEYED, HMAC, MD5, SHA1, SHA256, SHA384, SHA512) CF_KEYWORDS(ALGORITHM, KEYED, HMAC, MD5, SHA1, SHA256, SHA384, SHA512)
CF_KEYWORDS(PRIMARY, STATS, COUNT, BY, FOR, COMMANDS, PREEXPORT, NOEXPORT, GENERATE) CF_KEYWORDS(PRIMARY, STATS, COUNT, BY, FOR, COMMANDS, PREEXPORT, NOEXPORT, EXPORTED, GENERATE)
CF_KEYWORDS(BGP, PASSWORDS, DESCRIPTION, SORTED) CF_KEYWORDS(BGP, PASSWORDS, DESCRIPTION, SORTED)
CF_KEYWORDS(RELOAD, IN, OUT, MRTDUMP, MESSAGES, RESTRICT, MEMORY, IGP_METRIC, CLASS, DSCP) CF_KEYWORDS(RELOAD, IN, OUT, MRTDUMP, MESSAGES, RESTRICT, MEMORY, IGP_METRIC, CLASS, DSCP)
CF_KEYWORDS(TIMEFORMAT, ISO, SHORT, LONG, ROUTE, PROTOCOL, BASE, LOG, S, MS, US) CF_KEYWORDS(TIMEFORMAT, ISO, SHORT, LONG, ROUTE, PROTOCOL, BASE, LOG, S, MS, US)
@ -685,6 +685,7 @@ export_mode:
PREEXPORT { $$ = RSEM_PREEXPORT; } PREEXPORT { $$ = RSEM_PREEXPORT; }
| EXPORT { $$ = RSEM_EXPORT; } | EXPORT { $$ = RSEM_EXPORT; }
| NOEXPORT { $$ = RSEM_NOEXPORT; } | NOEXPORT { $$ = RSEM_NOEXPORT; }
| EXPORTED { $$ = RSEM_EXPORTED; }
; ;
/* This is ugly hack */ /* This is ugly hack */

27
nest/proto.c
View File

@ -255,6 +255,22 @@ channel_feed_loop(void *ptr)
return; return;
} }
/* Reset export limit if the feed ended with acceptable number of exported routes */
struct channel_limit *l = &c->out_limit;
if (c->refeeding &&
(l->state == PLS_BLOCKED) &&
(c->refeed_count <= l->limit) &&
(c->stats.exp_routes <= l->limit))
{
log(L_INFO "Protocol %s resets route export limit (%u)", c->proto->name, l->limit);
channel_reset_limit(&c->out_limit);
/* Continue in feed - it will process routing table again from beginning */
c->refeed_count = 0;
ev_schedule(c->feed_event);
return;
}
// DBG("Feeding protocol %s finished\n", p->name); // DBG("Feeding protocol %s finished\n", p->name);
c->export_state = ES_READY; c->export_state = ES_READY;
// proto_log_state_change(p); // proto_log_state_change(p);
@ -282,6 +298,7 @@ channel_stop_export(struct channel *c)
c->export_state = ES_DOWN; c->export_state = ES_DOWN;
c->stats.exp_routes = 0; c->stats.exp_routes = 0;
bmap_reset(&c->export_map, 1024);
} }
@ -360,6 +377,9 @@ channel_do_start(struct channel *c)
c->feed_event = ev_new_init(c->proto->pool, channel_feed_loop, c); c->feed_event = ev_new_init(c->proto->pool, channel_feed_loop, c);
bmap_init(&c->export_map, c->proto->pool, 1024);
memset(&c->stats, 0, sizeof(struct proto_stats));
channel_reset_limit(&c->rx_limit); channel_reset_limit(&c->rx_limit);
channel_reset_limit(&c->in_limit); channel_reset_limit(&c->in_limit);
channel_reset_limit(&c->out_limit); channel_reset_limit(&c->out_limit);
@ -391,6 +411,7 @@ channel_do_down(struct channel *c)
if ((c->stats.imp_routes + c->stats.filt_routes) != 0) if ((c->stats.imp_routes + c->stats.filt_routes) != 0)
log(L_ERR "%s: Channel %s is down but still has some routes", c->proto->name, c->name); log(L_ERR "%s: Channel %s is down but still has some routes", c->proto->name, c->name);
bmap_free(&c->export_map);
memset(&c->stats, 0, sizeof(struct proto_stats)); memset(&c->stats, 0, sizeof(struct proto_stats));
c->in_table = NULL; c->in_table = NULL;
@ -503,10 +524,8 @@ channel_request_feeding(struct channel *c)
rt_feed_channel_abort(c); rt_feed_channel_abort(c);
} }
channel_reset_limit(&c->out_limit); /* Track number of exported routes during refeed */
c->refeed_count = 0;
/* Hack: reset exp_routes during refeed, and do not decrease it later */
c->stats.exp_routes = 0;
channel_schedule_feed(c, 0); /* Sets ES_FEEDING */ channel_schedule_feed(c, 0); /* Sets ES_FEEDING */
// proto_log_state_change(c); // proto_log_state_change(c);

2
nest/protocol.h
View File

@ -507,6 +507,7 @@ struct channel {
struct rtable *table; struct rtable *table;
const struct filter *in_filter; /* Input filter */ const struct filter *in_filter; /* Input filter */
const struct filter *out_filter; /* Output filter */ const struct filter *out_filter; /* Output filter */
struct bmap export_map; /* Keeps track which routes passed export filter */
struct channel_limit rx_limit; /* Receive limit (for in_keep_filtered) */ struct channel_limit rx_limit; /* Receive limit (for in_keep_filtered) */
struct channel_limit in_limit; /* Input limit */ struct channel_limit in_limit; /* Input limit */
struct channel_limit out_limit; /* Output limit */ struct channel_limit out_limit; /* Output limit */
@ -514,6 +515,7 @@ struct channel {
struct event *feed_event; /* Event responsible for feeding */ struct event *feed_event; /* Event responsible for feeding */
struct fib_iterator feed_fit; /* Routing table iterator used during feeding */ struct fib_iterator feed_fit; /* Routing table iterator used during feeding */
struct proto_stats stats; /* Per-channel protocol statistics */ struct proto_stats stats; /* Per-channel protocol statistics */
u32 refeed_count; /* Number of routes exported during refeed regardless of out_limit */
u8 net_type; /* Routing table network type (NET_*), 0 for undefined */ u8 net_type; /* Routing table network type (NET_*), 0 for undefined */
u8 ra_mode; /* Mode of received route advertisements (RA_*) */ u8 ra_mode; /* Mode of received route advertisements (RA_*) */

4
nest/route.h
View File

@ -10,6 +10,7 @@
#define _BIRD_ROUTE_H_ #define _BIRD_ROUTE_H_
#include "lib/lists.h" #include "lib/lists.h"
#include "lib/bitmap.h"
#include "lib/resource.h" #include "lib/resource.h"
#include "lib/net.h" #include "lib/net.h"
@ -152,6 +153,7 @@ typedef struct rtable {
int pipe_busy; /* Pipe loop detection */ int pipe_busy; /* Pipe loop detection */
int use_count; /* Number of protocols using this table */ int use_count; /* Number of protocols using this table */
u32 rt_count; /* Number of routes in the table */ u32 rt_count; /* Number of routes in the table */
struct hmap id_map;
struct hostcache *hostcache; struct hostcache *hostcache;
struct rtable_config *config; /* Configuration of this table */ struct rtable_config *config; /* Configuration of this table */
struct config *deleted; /* Table doesn't exist in current configuration, struct config *deleted; /* Table doesn't exist in current configuration,
@ -210,6 +212,7 @@ typedef struct rte {
net *net; /* Network this RTE belongs to */ net *net; /* Network this RTE belongs to */
struct channel *sender; /* Channel used to send the route to the routing table */ struct channel *sender; /* Channel used to send the route to the routing table */
struct rta *attrs; /* Attributes of this route */ struct rta *attrs; /* Attributes of this route */
u32 id; /* Table specific route id */
byte flags; /* Flags (REF_...) */ byte flags; /* Flags (REF_...) */
byte pflags; /* Protocol-specific flags */ byte pflags; /* Protocol-specific flags */
word pref; /* Route preference */ word pref; /* Route preference */
@ -369,6 +372,7 @@ struct rt_show_data_rtable * rt_show_add_table(struct rt_show_data *d, rtable *t
#define RSEM_PREEXPORT 1 /* Routes ready for export, before filtering */ #define RSEM_PREEXPORT 1 /* Routes ready for export, before filtering */
#define RSEM_EXPORT 2 /* Routes accepted by export filter */ #define RSEM_EXPORT 2 /* Routes accepted by export filter */
#define RSEM_NOEXPORT 3 /* Routes rejected by export filter */ #define RSEM_NOEXPORT 3 /* Routes rejected by export filter */
#define RSEM_EXPORTED 4 /* Routes marked in export map */
/* /*
* Route Attributes * Route Attributes

12
nest/rt-show.c
View File

@ -120,9 +120,17 @@ rt_show_net(struct cli *c, net *n, struct rt_show_data *d)
if (ec && (ec->export_state == ES_DOWN)) if (ec && (ec->export_state == ES_DOWN))
goto skip; goto skip;
/* Special case for merged export */ if (d->export_mode == RSEM_EXPORTED)
if ((d->export_mode == RSEM_EXPORT) && (ec->ra_mode == RA_MERGED)) {
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))
{ {
/* Special case for merged export */
rte *rt_free; rte *rt_free;
e = rt_export_merged(ec, n, &rt_free, c->show_pool, 1); e = rt_export_merged(ec, n, &rt_free, c->show_pool, 1);
pass = 1; pass = 1;

522
nest/rt-table.c
View File

@ -282,6 +282,7 @@ rte_get_temp(rta *a)
rte *e = sl_alloc(rte_slab); rte *e = sl_alloc(rte_slab);
e->attrs = a; e->attrs = a;
e->id = 0;
e->flags = 0; e->flags = 0;
e->pref = 0; e->pref = 0;
return e; return e;
@ -637,51 +638,25 @@ do_rt_notify(struct channel *c, net *net, rte *new, rte *old, int refeed)
struct proto *p = c->proto; struct proto *p = c->proto;
struct proto_stats *stats = &c->stats; struct proto_stats *stats = &c->stats;
/* if (refeed && new)
* First, apply export limit. c->refeed_count++;
*
* Export route limits has several problems. Because exp_routes
* counter is reset before refeed, we don't really know whether
* limit is breached and whether the update is new or not. Therefore
* the number of really exported routes may exceed the limit
* temporarily (routes exported before and new routes in refeed).
*
* Minor advantage is that if the limit is decreased and refeed is
* requested, the number of exported routes really decrease.
*
* Second problem is that with export limits, we don't know whether
* old was really exported (it might be blocked by limit). When a
* withdraw is exported, we announce it even when the previous
* update was blocked. This is not a big issue, but the same problem
* is in updating exp_routes counter. Therefore, to be consistent in
* increases and decreases of exp_routes, we count exported routes
* regardless of blocking by limits.
*
* Similar problem is in handling updates - when a new route is
* received and blocking is active, the route would be blocked, but
* when an update for the route will be received later, the update
* would be propagated (as old != NULL). Therefore, we have to block
* also non-new updates (contrary to import blocking).
*/
/* Apply export limit */
struct channel_limit *l = &c->out_limit; struct channel_limit *l = &c->out_limit;
if (l->action && new) if (l->action && !old && new)
{
if (stats->exp_routes >= l->limit)
channel_notify_limit(c, l, PLD_OUT, stats->exp_routes);
if (l->state == PLS_BLOCKED)
{ {
if ((!old || refeed) && (stats->exp_routes >= l->limit)) stats->exp_updates_rejected++;
channel_notify_limit(c, l, PLD_OUT, stats->exp_routes); rte_trace_out(D_FILTERS, p, new, "rejected [limit]");
return;
if (l->state == PLS_BLOCKED)
{
stats->exp_routes++; /* see note above */
stats->exp_updates_rejected++;
rte_trace_out(D_FILTERS, p, new, "rejected [limit]");
new = NULL;
if (!old)
return;
}
} }
}
/* Apply export table */
if (c->out_table && !rte_update_out(c, net->n.addr, new, old, refeed)) if (c->out_table && !rte_update_out(c, net->n.addr, new, old, refeed))
return; return;
@ -690,236 +665,132 @@ do_rt_notify(struct channel *c, net *net, rte *new, rte *old, int refeed)
else else
stats->exp_withdraws_accepted++; stats->exp_withdraws_accepted++;
/* Hack: We do not decrease exp_routes during refeed, we instead if (old)
reset exp_routes at the start of refeed. */ {
if (new) bmap_clear(&c->export_map, old->id);
stats->exp_routes++;
if (old && !refeed)
stats->exp_routes--; stats->exp_routes--;
}
if (new)
{
bmap_set(&c->export_map, new->id);
stats->exp_routes++;
}
if (p->debug & D_ROUTES) if (p->debug & D_ROUTES)
{ {
if (new && old) if (new && old)
rte_trace_out(D_ROUTES, p, new, "replaced"); rte_trace_out(D_ROUTES, p, new, "replaced");
else if (new) else if (new)
rte_trace_out(D_ROUTES, p, new, "added"); rte_trace_out(D_ROUTES, p, new, "added");
else if (old) else if (old)
rte_trace_out(D_ROUTES, p, old, "removed"); rte_trace_out(D_ROUTES, p, old, "removed");
} }
p->rt_notify(p, c, net, new, old); p->rt_notify(p, c, net, new, old);
} }
static void static void
rt_notify_basic(struct channel *c, net *net, rte *new0, rte *old0, int refeed) rt_notify_basic(struct channel *c, net *net, rte *new, rte *old, int refeed)
{ {
struct proto *p = c->proto; // struct proto *p = c->proto;
rte *new = new0;
rte *old = old0;
rte *new_free = NULL; rte *new_free = NULL;
rte *old_free = NULL;
if (new) if (new)
c->stats.exp_updates_received++; c->stats.exp_updates_received++;
else else
c->stats.exp_withdraws_received++; c->stats.exp_withdraws_received++;
/*
* This is a tricky part - we don't know whether route 'old' was exported to
* protocol 'p' or was filtered by the export filter. We try to run the export
* filter to know this to have a correct value in 'old' argument of rte_update
* (and proper filter value).
*
* This is broken because 'configure soft' may change filters but keep routes.
* Refeed cycle is expected to be called after change of the filters and with
* old == new, therefore we do not even try to run the filter on an old route.
* This may lead to 'spurious withdraws' but ensure that there are no 'missing
* withdraws'.
*
* This is not completely safe as there is a window between reconfiguration
* and the end of refeed - if a newly filtered route disappears during this
* period, proper withdraw is not sent (because old would be also filtered)
* and the route is not refeeded (because it disappeared before that).
* This is handled below as a special case.
*/
if (new) if (new)
new = export_filter(c, new, &new_free, 0); new = export_filter(c, new, &new_free, 0);
if (old && !refeed) if (old && !bmap_test(&c->export_map, old->id))
old = export_filter(c, old, &old_free, 1); old = NULL;
if (!new && !old) if (!new && !old)
{
/*
* As mentioned above, 'old' value may be incorrect in some race conditions.
* We generally ignore it with two exceptions:
*
* First, withdraw to pipe protocol. In that case we rather propagate
* unfiltered withdraws regardless of export filters to ensure that when a
* protocol is flushed, its routes are removed from all tables. Possible
* spurious unfiltered withdraws are not problem here as they are ignored if
* there is no corresponding route at the other end of the pipe.
*
* Second, recent filter change. If old route is older than filter change,
* then it was previously evaluated by a different filter and we do not know
* whether it was really propagated. In that case we rather send spurious
* withdraw than do nothing and possibly cause phantom routes.
*
* In both cases wqe directly call rt_notify() hook instead of
* do_rt_notify() to avoid logging and stat counters.
*/
int pipe_withdraw = 0, filter_change = 0;
#ifdef CONFIG_PIPE
pipe_withdraw = (p->proto == &proto_pipe) && !new0;
#endif
filter_change = old0 && (old0->lastmod <= c->last_tx_filter_change);
if ((pipe_withdraw || filter_change) && (p != old0->sender->proto))
{
c->stats.exp_withdraws_accepted++;
p->rt_notify(p, c, net, NULL, old0);
}
return; return;
}
do_rt_notify(c, net, new, old, refeed); do_rt_notify(c, net, new, old, refeed);
/* Discard temporary rte's */ /* Discard temporary rte */
if (new_free) if (new_free)
rte_free(new_free); rte_free(new_free);
if (old_free)
rte_free(old_free);
} }
static void static void
rt_notify_accepted(struct channel *c, net *net, rte *new_changed, rte *old_changed, rte *before_old, int feed) rt_notify_accepted(struct channel *c, net *net, rte *new_changed, rte *old_changed, int refeed)
{ {
struct proto *p = c->proto; // struct proto *p = c->proto;
rte *r;
rte *new_best = NULL; rte *new_best = NULL;
rte *old_best = NULL; rte *old_best = NULL;
rte *new_free = NULL; rte *new_free = NULL;
rte *old_free = NULL; int new_first = 0;
/* Used to track whether we met old_changed position. If before_old is NULL /*
old_changed was the first and we met it implicitly before current best route. */ * We assume that there are no changes in net route order except (added)
int old_meet = old_changed && !before_old; * new_changed and (removed) old_changed. Therefore, the function is not
* compatible with deterministic_med (where nontrivial reordering can happen
* as a result of a route change) and with recomputation of recursive routes
* due to next hop update (where many routes can be changed in one step).
*
* Note that we need this assumption just for optimizations, we could just
* run full new_best recomputation otherwise.
*
* There are three cases:
* feed or old_best is old_changed -> we need to recompute new_best
* old_best is before new_changed -> new_best is old_best, ignore
* old_best is after new_changed -> try new_changed, otherwise old_best
*/
/* Note that before_old is either NULL or valid (not rejected) route. if (net->routes)
If old_changed is valid, before_old have to be too. If old changed route
was not valid, caller must use NULL for both old_changed and before_old. */
if (new_changed)
c->stats.exp_updates_received++; c->stats.exp_updates_received++;
else else
c->stats.exp_withdraws_received++; c->stats.exp_withdraws_received++;
/* First, find the new_best route - first accepted by filters */ /* Find old_best - either old_changed, or route for net->routes */
for (r=net->routes; rte_is_valid(r); r=r->next) if (old_changed && bmap_test(&c->export_map, old_changed->id))
old_best = old_changed;
else
{
for (rte *r = net->routes; rte_is_valid(r); r = r->next)
{ {
if (bmap_test(&c->export_map, r->id))
{
old_best = r;
break;
}
/* Note if new_changed found before old_best */
if (r == new_changed)
new_first = 1;
}
}
/* Find new_best */
if ((new_changed == old_changed) || (old_best == old_changed))
{
/* Feed or old_best changed -> find first accepted by filters */
for (rte *r = net->routes; rte_is_valid(r); r = r->next)
if (new_best = export_filter(c, r, &new_free, 0)) if (new_best = export_filter(c, r, &new_free, 0))
break; break;
}
else
{
/* Other cases -> either new_changed, or old_best (and nothing changed) */
if (new_first && (new_changed = export_filter(c, new_changed, &new_free, 0)))
new_best = new_changed;
else
return;
}
/* Note if we walked around the position of old_changed route */ if (!new_best && !old_best)
if (r == before_old)
old_meet = 1;
}
/*
* Second, handle the feed case. That means we do not care for
* old_best. It is NULL for feed, and the new_best for refeed.
* For refeed, there is a hack similar to one in rt_notify_basic()
* to ensure withdraws in case of changed filters
*/
if (feed)
{
if (feed == 2) /* refeed */
old_best = new_best ? new_best :
(rte_is_valid(net->routes) ? net->routes : NULL);
else
old_best = NULL;
if (!new_best && !old_best)
return;
goto found;
}
/*
* Now, we find the old_best route. Generally, it is the same as the
* new_best, unless new_best is the same as new_changed or
* old_changed is accepted before new_best.
*
* There are four cases:
*
* - We would find and accept old_changed before new_best, therefore
* old_changed is old_best. In remaining cases we suppose this
* is not true.
*
* - We found no new_best, therefore there is also no old_best and
* we ignore this withdraw.
*
* - We found new_best different than new_changed, therefore
* old_best is the same as new_best and we ignore this update.
*
* - We found new_best the same as new_changed, therefore it cannot
* be old_best and we have to continue search for old_best.
*
* There is also a hack to ensure consistency in case of changed filters.
* It does not find the proper old_best, just selects a non-NULL route.
*/
/* Hack for changed filters */
if (old_changed &&
(p != old_changed->sender->proto) &&
(old_changed->lastmod <= c->last_tx_filter_change))
{
old_best = old_changed;
goto found;
}
/* First case */
if (old_meet)
if (old_best = export_filter(c, old_changed, &old_free, 1))
goto found;
/* Second case */
if (!new_best)
return; return;
/* Third case, we use r instead of new_best, because export_filter() could change it */ do_rt_notify(c, net, new_best, old_best, refeed);
if (r != new_changed)
{
if (new_free)
rte_free(new_free);
return;
}
/* Fourth case */ /* Discard temporary rte */
for (r=r->next; rte_is_valid(r); r=r->next)
{
if (old_best = export_filter(c, r, &old_free, 1))
goto found;
if (r == before_old)
if (old_best = export_filter(c, old_changed, &old_free, 1))
goto found;
}
/* Implicitly, old_best is NULL and new_best is non-NULL */
found:
do_rt_notify(c, net, new_best, old_best, (feed == 2));
/* Discard temporary rte's */
if (new_free) if (new_free)
rte_free(new_free); rte_free(new_free);
if (old_free)
rte_free(old_free);
} }
@ -984,14 +855,10 @@ rt_export_merged(struct channel *c, net *net, rte **rt_free, linpool *pool, int
static void static void
rt_notify_merged(struct channel *c, net *net, rte *new_changed, rte *old_changed, rt_notify_merged(struct channel *c, net *net, rte *new_changed, rte *old_changed,
rte *new_best, rte*old_best, int refeed) rte *new_best, rte *old_best, int refeed)
{ {
// struct proto *p = c->proto; // struct proto *p = c->proto;
rte *new_free = NULL;
rte *new_best_free = NULL;
rte *old_best_free = NULL;
rte *new_changed_free = NULL;
rte *old_changed_free = NULL;
/* We assume that all rte arguments are either NULL or rte_is_valid() */ /* We assume that all rte arguments are either NULL or rte_is_valid() */
@ -1000,17 +867,11 @@ rt_notify_merged(struct channel *c, net *net, rte *new_changed, rte *old_changed
return; return;
/* Check whether the change is relevant to the merged route */ /* Check whether the change is relevant to the merged route */
if ((new_best == old_best) && !refeed) if ((new_best == old_best) &&
{ (new_changed != old_changed) &&
new_changed = rte_mergable(new_best, new_changed) ? !rte_mergable(new_best, new_changed) &&
export_filter(c, new_changed, &new_changed_free, 1) : NULL; !rte_mergable(old_best, old_changed))
return;
old_changed = rte_mergable(old_best, old_changed) ?
export_filter(c, old_changed, &old_changed_free, 1) : NULL;
if (!new_changed && !old_changed)
return;
}
if (new_best) if (new_best)
c->stats.exp_updates_received++; c->stats.exp_updates_received++;
@ -1019,69 +880,71 @@ rt_notify_merged(struct channel *c, net *net, rte *new_changed, rte *old_changed
/* Prepare new merged route */ /* Prepare new merged route */
if (new_best) if (new_best)
new_best = rt_export_merged(c, net, &new_best_free, rte_update_pool, 0); new_best = rt_export_merged(c, net, &new_free, rte_update_pool, 0);
/* Prepare old merged route (without proper merged next hops) */ /* Check old merged route */
/* There are some issues with running filter on old route - see rt_notify_basic() */ if (old_best && !bmap_test(&c->export_map, old_best->id))
if (old_best && !refeed) old_best = NULL;
old_best = export_filter(c, old_best, &old_best_free, 1);
if (new_best || old_best) if (!new_best && !old_best)
do_rt_notify(c, net, new_best, old_best, refeed); return;
/* Discard temporary rte's */ do_rt_notify(c, net, new_best, old_best, refeed);
if (new_best_free)
rte_free(new_best_free); /* Discard temporary rte */
if (old_best_free) if (new_free)
rte_free(old_best_free); rte_free(new_free);
if (new_changed_free)
rte_free(new_changed_free);
if (old_changed_free)
rte_free(old_changed_free);
} }
/** /**
* rte_announce - announce a routing table change * rte_announce - announce a routing table change
* @tab: table the route has been added to * @tab: table the route has been added to
* @type: type of route announcement (RA_OPTIMAL or RA_ANY) * @type: type of route announcement (RA_UNDEF or RA_ANY)
* @net: network in question * @net: network in question
* @new: the new route to be announced * @new: the new or changed route
* @old: the previous route for the same network * @old: the previous route replaced by the new one
* @new_best: the new best route for the same network * @new_best: the new best route for the same network
* @old_best: the previous best route for the same network * @old_best: the previous best route for the same network
* @before_old: The previous route before @old for the same network.
* If @before_old is NULL @old was the first.
* *
* This function gets a routing table update and announces it * This function gets a routing table update and announces it to all protocols
* to all protocols that acccepts given type of route announcement * that are connected to the same table by their channels.
* and are connected to the same table by their announcement hooks.
* *
* Route announcement of type %RA_OPTIMAL si generated when optimal * There are two ways of how routing table changes are announced. First, there
* route (in routing table @tab) changes. In that case @old stores the * is a change of just one route in @net (which may caused a change of the best
* old optimal route. * route of the network). In this case @new and @old describes the changed route
* and @new_best and @old_best describes best routes. Other routes are not
* affected, but in sorted table the order of other routes might change.
* *
* Route announcement of type %RA_ANY si generated when any route (in * Second, There is a bulk change of multiple routes in @net, with shared best
* routing table @tab) changes In that case @old stores the old route * route selection. In such case separate route changes are described using
* from the same protocol. * @type of %RA_ANY, with @new and @old specifying the changed route, while
* @new_best and @old_best are NULL. After that, another notification is done
* where @new_best and @old_best are filled (may be the same), but @new and @old
* are NULL.
* *
* For each appropriate protocol, we first call its preexport() * The function announces the change to all associated channels. For each
* hook which performs basic checks on the route (each protocol has a * channel, an appropriate preprocessing is done according to channel &ra_mode.
* right to veto or force accept of the route before any filter is * For example, %RA_OPTIMAL channels receive just changes of best routes.
* asked) and adds default values of attributes specific to the new *
* protocol (metrics, tags etc.). Then it consults the protocol's * In general, we first call preexport() hook of a protocol, which performs
* export filter and if it accepts the route, the rt_notify() hook of * basic checks on the route (each protocol has a right to veto or force accept
* the protocol gets called. * of the route before any filter is asked). Then we consult an export filter
* of the channel and verify the old route in an export map of the channel.
* Finally, the rt_notify() hook of the protocol gets called.
*
* Note that there are also calls of rt_notify() hooks due to feed, but that is
* done outside of scope of rte_announce().
*/ */
static void static void
rte_announce(rtable *tab, unsigned type, net *net, rte *new, rte *old, rte_announce(rtable *tab, uint type, net *net, rte *new, rte *old,
rte *new_best, rte *old_best, rte *before_old) rte *new_best, rte *old_best)
{ {
if (!rte_is_valid(new)) if (!rte_is_valid(new))
new = NULL; new = NULL;
if (!rte_is_valid(old)) if (!rte_is_valid(old))
old = before_old = NULL; old = NULL;
if (!rte_is_valid(new_best)) if (!rte_is_valid(new_best))
new_best = NULL; new_best = NULL;
@ -1089,15 +952,15 @@ rte_announce(rtable *tab, unsigned type, net *net, rte *new, rte *old,
if (!rte_is_valid(old_best)) if (!rte_is_valid(old_best))
old_best = NULL; old_best = NULL;
if (!old && !new) if (!new && !old && !new_best && !old_best)
return; return;
if (type == RA_OPTIMAL) if (new_best != old_best)
{ {
if (new) if (new_best)
new->sender->stats.pref_routes++; new_best->sender->stats.pref_routes++;
if (old) if (old_best)
old->sender->stats.pref_routes--; old_best->sender->stats.pref_routes--;
if (tab->hostcache) if (tab->hostcache)
rt_notify_hostcache(tab, net); rt_notify_hostcache(tab, net);
@ -1105,18 +968,34 @@ rte_announce(rtable *tab, unsigned type, net *net, rte *new, rte *old,
struct channel *c; node *n; struct channel *c; node *n;
WALK_LIST2(c, n, tab->channels, table_node) WALK_LIST2(c, n, tab->channels, table_node)
{ {
if (c->export_state == ES_DOWN) if (c->export_state == ES_DOWN)
continue; continue;
if (c->ra_mode == type) if (type && (type != c->ra_mode))
if (type == RA_ACCEPTED) continue;
rt_notify_accepted(c, net, new, old, before_old, 0);
else if (type == RA_MERGED) switch (c->ra_mode)
rt_notify_merged(c, net, new, old, new_best, old_best, 0); {
else case RA_OPTIMAL:
rt_notify_basic(c, net, new, old, 0); if (new_best != old_best)
rt_notify_basic(c, net, new_best, old_best, 0);
break;
case RA_ANY:
if (new != old)
rt_notify_basic(c, net, new, old, 0);
break;
case RA_ACCEPTED:
rt_notify_accepted(c, net, new, old, 0);
break;
case RA_MERGED:
rt_notify_merged(c, net, new, old, new_best, old_best, 0);
break;
} }
}
} }
static inline int static inline int
@ -1418,7 +1297,17 @@ rte_recalculate(struct channel *c, net *net, rte *new, struct rte_src *src)
} }
if (new) if (new)
new->lastmod = current_time(); {
new->lastmod = current_time();
if (!old)
{
new->id = hmap_first_zero(&table->id_map);
hmap_set(&table->id_map, new->id);
}
else
new->id = old->id;
}
/* Log the route change */ /* Log the route change */
if (p->debug & D_ROUTES) if (p->debug & D_ROUTES)
@ -1437,12 +1326,7 @@ rte_recalculate(struct channel *c, net *net, rte *new, struct rte_src *src)
} }
/* Propagate the route change */ /* Propagate the route change */
rte_announce(table, RA_ANY, net, new, old, NULL, NULL, NULL); rte_announce(table, RA_UNDEF, net, new, old, net->routes, old_best);
if (net->routes != old_best)
rte_announce(table, RA_OPTIMAL, net, net->routes, old_best, NULL, NULL, NULL);
if (table->config->sorted)
rte_announce(table, RA_ACCEPTED, net, new, old, NULL, NULL, before_old);
rte_announce(table, RA_MERGED, net, new, old, net->routes, old_best, NULL);
if (!net->routes && if (!net->routes &&
(table->gc_counter++ >= table->config->gc_max_ops) && (table->gc_counter++ >= table->config->gc_max_ops) &&
@ -1455,7 +1339,12 @@ rte_recalculate(struct channel *c, net *net, rte *new, struct rte_src *src)
p->rte_insert(net, new); p->rte_insert(net, new);
if (old) if (old)
rte_free_quick(old); {
if (!new)
hmap_clear(&table->id_map, old->id);
rte_free_quick(old);
}
} }
static int rte_update_nest_cnt; /* Nesting counter to allow recursive updates */ static int rte_update_nest_cnt; /* Nesting counter to allow recursive updates */
@ -1642,11 +1531,11 @@ rte_update2(struct channel *c, const net_addr *n, rte *new, struct rte_src *src)
/* Independent call to rte_announce(), used from next hop /* Independent call to rte_announce(), used from next hop
recalculation, outside of rte_update(). new must be non-NULL */ recalculation, outside of rte_update(). new must be non-NULL */
static inline void static inline void
rte_announce_i(rtable *tab, unsigned type, net *net, rte *new, rte *old, rte_announce_i(rtable *tab, uint type, net *net, rte *new, rte *old,
rte *new_best, rte *old_best) rte *new_best, rte *old_best)
{ {
rte_update_lock(); rte_update_lock();
rte_announce(tab, type, net, new, old, new_best, old_best, NULL); rte_announce(tab, type, net, new, old, new_best, old_best);
rte_update_unlock(); rte_update_unlock();
} }
@ -1905,6 +1794,9 @@ rt_setup(pool *p, rtable *t, struct rtable_config *cf)
fib_init(&t->fib, p, t->addr_type, sizeof(net), OFFSETOF(net, n), 0, NULL); fib_init(&t->fib, p, t->addr_type, sizeof(net), OFFSETOF(net, n), 0, NULL);
init_list(&t->channels); init_list(&t->channels);
hmap_init(&t->id_map, p, 1024);
hmap_set(&t->id_map, 0);
t->rt_event = ev_new_init(p, rt_event, t); t->rt_event = ev_new_init(p, rt_event, t);
t->gc_time = current_time(); t->gc_time = current_time();
} }
@ -2200,8 +2092,8 @@ rt_next_hop_update_net(rtable *tab, net *n)
new = rt_next_hop_update_rte(tab, e); new = rt_next_hop_update_rte(tab, e);
*k = new; *k = new;
rte_announce_i(tab, RA_ANY, n, new, e, NULL, NULL);
rte_trace_in(D_ROUTES, new->sender->proto, new, "updated"); rte_trace_in(D_ROUTES, new->sender->proto, new, "updated");
rte_announce_i(tab, RA_ANY, n, new, e, NULL, NULL);
/* Call a pre-comparison hook */ /* Call a pre-comparison hook */
/* Not really an efficient way to compute this */ /* Not really an efficient way to compute this */
@ -2239,13 +2131,10 @@ rt_next_hop_update_net(rtable *tab, net *n)
/* Announce the new best route */ /* Announce the new best route */
if (new != old_best) if (new != old_best)
{ rte_trace_in(D_ROUTES, new->sender->proto, new, "updated [best]");
rte_announce_i(tab, RA_OPTIMAL, n, new, old_best, NULL, NULL);
rte_trace_in(D_ROUTES, new->sender->proto, new, "updated [best]");
}
/* FIXME: Better announcement of merged routes */ /* Propagate changes */
rte_announce_i(tab, RA_MERGED, n, new, old_best, new, old_best); rte_announce_i(tab, RA_UNDEF, n, NULL, NULL, n->routes, old_best);
if (free_old_best) if (free_old_best)
rte_free_quick(old_best); rte_free_quick(old_best);
@ -2351,6 +2240,7 @@ rt_unlock_table(rtable *r)
rt_free_hostcache(r); rt_free_hostcache(r);
rem_node(&r->n); rem_node(&r->n);
fib_free(&r->fib); fib_free(&r->fib);
hmap_free(&r->id_map);
rfree(r->rt_event); rfree(r->rt_event);
mb_free(r); mb_free(r);
config_del_obstacle(conf); config_del_obstacle(conf);
@ -2428,11 +2318,11 @@ do_feed_channel(struct channel *c, net *n, rte *e)
{ {
rte_update_lock(); rte_update_lock();
if (c->ra_mode == RA_ACCEPTED) if (c->ra_mode == RA_ACCEPTED)
rt_notify_accepted(c, n, e, NULL, NULL, c->refeeding ? 2 : 1); rt_notify_accepted(c, n, NULL, NULL, c->refeeding);
else if (c->ra_mode == RA_MERGED) else if (c->ra_mode == RA_MERGED)
rt_notify_merged(c, n, NULL, NULL, e, c->refeeding ? e : NULL, c->refeeding); rt_notify_merged(c, n, NULL, NULL, e, e, c->refeeding);
else /* RA_BASIC */ else /* RA_BASIC */
rt_notify_basic(c, n, e, c->refeeding ? e : NULL, c->refeeding); rt_notify_basic(c, n, e, e, c->refeeding);
rte_update_unlock(); rte_update_unlock();
} }
@ -2468,8 +2358,6 @@ rt_feed_channel(struct channel *c)
return 0; return 0;
} }
/* FIXME: perhaps we should change feed for RA_ACCEPTED to not use 'new' */
if ((c->ra_mode == RA_OPTIMAL) || if ((c->ra_mode == RA_OPTIMAL) ||
(c->ra_mode == RA_ACCEPTED) || (c->ra_mode == RA_ACCEPTED) ||
(c->ra_mode == RA_MERGED)) (c->ra_mode == RA_MERGED))

7
sysdep/unix/krt.c
View File

@ -736,11 +736,8 @@ krt_prune(struct krt_proto *p)
switch (verdict) switch (verdict)
{ {
case KRF_CREATE: case KRF_CREATE:
if (new && (n->n.flags & KRF_INSTALLED)) krt_trace_in(p, new, "reinstalling");
{ krt_replace_rte(p, n, new, NULL);
krt_trace_in(p, new, "reinstalling");
krt_replace_rte(p, n, new, NULL);
}
break; break;
case KRF_SEEN: case KRF_SEEN:
case KRF_IGNORE: case KRF_IGNORE: