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bird/nest/rt-table.c
Ondrej Zajicek 00a09f3c36 Implement RA_ACCEPTED mode of route propagation.
2012-04-15 15:07:58 +02:00

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/*
* BIRD -- Routing Tables
*
* (c) 1998--2000 Martin Mares <mj@ucw.cz>
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
/**
* DOC: Routing tables
*
* Routing tables are probably the most important structures BIRD uses. They
* hold all the information about known networks, the associated routes and
* their attributes.
*
* There are multiple routing tables (a primary one together with any
* number of secondary ones if requested by the configuration). Each table
* is basically a FIB containing entries describing the individual
* destination networks. For each network (represented by structure &net),
* there is a one-way linked list of route entries (&rte), the first entry
* on the list being the best one (i.e., the one we currently use
* for routing), the order of the other ones is undetermined.
*
* The &rte contains information specific to the route (preference, protocol
* metrics, time of last modification etc.) and a pointer to a &rta structure
* (see the route attribute module for a precise explanation) holding the
* remaining route attributes which are expected to be shared by multiple
* routes in order to conserve memory.
*/
#undef LOCAL_DEBUG
#include "nest/bird.h"
#include "nest/route.h"
#include "nest/protocol.h"
#include "nest/cli.h"
#include "nest/iface.h"
#include "lib/resource.h"
#include "lib/event.h"
#include "lib/string.h"
#include "conf/conf.h"
#include "filter/filter.h"
#include "lib/string.h"
#include "lib/alloca.h"
pool *rt_table_pool;
static slab *rte_slab;
static linpool *rte_update_pool;
static list routing_tables;
static void rt_format_via(rte *e, byte *via);
static void rt_free_hostcache(rtable *tab);
static void rt_notify_hostcache(rtable *tab, net *net);
static void rt_update_hostcache(rtable *tab);
static void rt_next_hop_update(rtable *tab);
static inline void rt_schedule_gc(rtable *tab);
/* Like fib_route(), but skips empty net entries */
static net *
net_route(rtable *tab, ip_addr a, int len)
{
ip_addr a0;
net *n;
while (len >= 0)
{
a0 = ipa_and(a, ipa_mkmask(len));
n = fib_find(&tab->fib, &a0, len);
if (n && n->routes)
return n;
len--;
}
return NULL;
}
static void
rte_init(struct fib_node *N)
{
net *n = (net *) N;
N->flags = 0;
n->routes = NULL;
}
/**
* rte_find - find a route
* @net: network node
* @p: protocol
*
* The rte_find() function returns a route for destination @net
* which belongs has been defined by protocol @p.
*/
rte *
rte_find(net *net, struct proto *p)
{
rte *e = net->routes;
while (e && e->attrs->proto != p)
e = e->next;
return e;
}
/**
* rte_get_temp - get a temporary &rte
* @a: attributes to assign to the new route (a &rta; in case it's
* un-cached, rte_update() will create a cached copy automatically)
*
* Create a temporary &rte and bind it with the attributes @a.
* Also set route preference to the default preference set for
* the protocol.
*/
rte *
rte_get_temp(rta *a)
{
rte *e = sl_alloc(rte_slab);
e->attrs = a;
e->flags = 0;
e->pref = a->proto->preference;
return e;
}
rte *
rte_do_cow(rte *r)
{
rte *e = sl_alloc(rte_slab);
memcpy(e, r, sizeof(rte));
e->attrs = rta_clone(r->attrs);
e->flags = 0;
return e;
}
static int /* Actually better or at least as good as */
rte_better(rte *new, rte *old)
{
int (*better)(rte *, rte *);
if (!old)
return 1;
if (new->pref > old->pref)
return 1;
if (new->pref < old->pref)
return 0;
if (new->attrs->proto->proto != old->attrs->proto->proto)
{
/*
* If the user has configured protocol preferences, so that two different protocols
* have the same preference, try to break the tie by comparing addresses. Not too
* useful, but keeps the ordering of routes unambiguous.
*/
return new->attrs->proto->proto > old->attrs->proto->proto;
}
if (better = new->attrs->proto->rte_better)
return better(new, old);
return 0;
}
static void
rte_trace(struct proto *p, rte *e, int dir, char *msg)
{
byte via[STD_ADDRESS_P_LENGTH+32];
rt_format_via(e, via);
log(L_TRACE "%s %c %s %I/%d %s", p->name, dir, msg, e->net->n.prefix, e->net->n.pxlen, via);
}
static inline void
rte_trace_in(unsigned int flag, struct proto *p, rte *e, char *msg)
{
if (p->debug & flag)
rte_trace(p, e, '>', msg);
}
static inline void
rte_trace_out(unsigned int flag, struct proto *p, rte *e, char *msg)
{
if (p->debug & flag)
rte_trace(p, e, '<', msg);
}
static rte *
export_filter(struct announce_hook *ah, rte *rt0, rte **rt_free, ea_list **tmpa, int silent)
{
struct proto *p = ah->proto;
struct filter *filter = ah->out_filter;
struct proto_stats *stats = ah->stats;
ea_list *tmpb = NULL;
rte *rt;
int v;
rt = rt0;
*rt_free = NULL;
/* If called does not care for eattrs, we prepare one internally */
if (!tmpa)
{
struct proto *src = rt->attrs->proto;
tmpb = src->make_tmp_attrs ? src->make_tmp_attrs(rt, rte_update_pool) : NULL;
tmpa = &tmpb;
}
v = p->import_control ? p->import_control(p, &rt, tmpa, rte_update_pool) : 0;
if (v < 0)
{
if (silent)
goto reject;
stats->exp_updates_rejected++;
rte_trace_out(D_FILTERS, p, rt, "rejected by protocol");
goto reject;
}
if (v > 0)
{
if (!silent)
rte_trace_out(D_FILTERS, p, rt, "forced accept by protocol");
goto accept;
}
v = filter && ((filter == FILTER_REJECT) ||
(f_run(filter, &rt, tmpa, rte_update_pool, FF_FORCE_TMPATTR) > F_ACCEPT));
if (v)
{
if (silent)
goto reject;
stats->exp_updates_filtered++;
rte_trace_out(D_FILTERS, p, rt, "filtered out");
goto reject;
}
accept:
if (rt != rt0)
*rt_free = rt;
return rt;
reject:
/* Discard temporary rte */
if (rt != rt0)
rte_free(rt);
return NULL;
}
static void
do_rt_notify(struct announce_hook *ah, net *net, rte *new, rte *old, ea_list *tmpa, int refeed)
{
struct proto *p = ah->proto;
struct proto_stats *stats = ah->stats;
if (new)
stats->exp_updates_accepted++;
else
stats->exp_withdraws_accepted++;
/* Hack: We do not decrease exp_routes during refeed, we instead
reset exp_routes at the start of refeed. */
if (new)
stats->exp_routes++;
if (old && !refeed)
stats->exp_routes--;
if (p->debug & D_ROUTES)
{
if (new && old)
rte_trace_out(D_ROUTES, p, new, "replaced");
else if (new)
rte_trace_out(D_ROUTES, p, new, "added");
else if (old)
rte_trace_out(D_ROUTES, p, old, "removed");
}
if (!new)
p->rt_notify(p, ah->table, net, NULL, old, NULL);
else if (tmpa)
{
ea_list *t = tmpa;
while (t->next)
t = t->next;
t->next = new->attrs->eattrs;
p->rt_notify(p, ah->table, net, new, old, tmpa);
t->next = NULL;
}
else
p->rt_notify(p, ah->table, net, new, old, new->attrs->eattrs);
}
static void
rt_notify_basic(struct announce_hook *ah, net *net, rte *new, rte *old, ea_list *tmpa, int refeed)
{
// struct proto *p = ah->proto;
struct proto_stats *stats = ah->stats;
rte *new_free = NULL;
rte *old_free = NULL;
if (new)
stats->exp_updates_received++;
else
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)
*
* FIXME - this is broken because 'configure soft' may change
* filters but keep routes. Refeed 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).
*/
if (new)
new = export_filter(ah, new, &new_free, &tmpa, 0);
if (old && !refeed)
old = export_filter(ah, old, &old_free, NULL, 1);
/* FIXME - This is broken because of incorrect 'old' value (see above) */
if (!new && !old)
return;
do_rt_notify(ah, net, new, old, tmpa, refeed);
/* Discard temporary rte's */
if (new_free)
rte_free(new_free);
if (old_free)
rte_free(old_free);
}
static void
rt_notify_accepted(struct announce_hook *ah, net *net, rte *new_changed, rte *old_changed, rte *before_old,
ea_list *tmpa, int feed)
{
// struct proto *p = ah->proto;
struct proto_stats *stats = ah->stats;
rte *new_best = NULL;
rte *old_best = NULL;
rte *new_free = NULL;
rte *old_free = NULL;
rte *r;
/* Used to track whethe we met old_changed position. If it is NULL
it was the first and met it implicitly before current best route. */
int old_meet = (old_changed && !before_old) ? 1 : 0;
if (new_changed)
stats->exp_updates_received++;
else
stats->exp_withdraws_received++;
/* First, find the new_best route - first accepted by filters */
for (r=net->routes; r; r=r->next)
{
if (new_best = export_filter(ah, r, &new_free, &tmpa, 0))
break;
/* Note if we walked around the position of old_changed route */
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 : net->routes;
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.
*/
/* First case */
if (old_meet)
if (old_best = export_filter(ah, old_changed, &old_free, NULL, 1))
goto found;
/* Second case */
if (!new_best)
return;
/* Third case, we use r insead of new_best, because export_filter() could change it */
if (r != new_changed)
{
if (new_free)
rte_free(new_free);
return;
}
/* Fourth case */
for (; r; r=r->next)
{
if (old_best = export_filter(ah, r, &old_free, NULL, 1))
goto found;
if (r == before_old)
if (old_best = export_filter(ah, old_changed, &old_free, NULL, 1))
goto found;
}
/* Implicitly, old_best is NULL and new_best is non-NULL */
found:
do_rt_notify(ah, net, new_best, old_best, tmpa, (feed == 2));
/* Discard temporary rte's */
if (new_free)
rte_free(new_free);
if (old_free)
rte_free(old_free);
}
/**
* rte_announce - announce a routing table change
* @tab: table the route has been added to
* @type: type of route announcement (RA_OPTIMAL or RA_ANY)
* @net: network in question
* @new: the new route to be announced
* @old: the previous route for the same network
* @tmpa: a list of temporary attributes belonging to the new route
*
* This function gets a routing table update and announces it
* to all protocols that acccepts given type of route announcement
* and are connected to the same table by their announcement hooks.
*
* Route announcement of type RA_OPTIMAL si generated when optimal
* route (in routing table @tab) changes. In that case @old stores the
* old optimal route.
*
* Route announcement of type RA_ANY si generated when any route (in
* routing table @tab) changes In that case @old stores the old route
* from the same protocol.
*
* For each appropriate protocol, we first call its import_control()
* hook which performs basic checks on the route (each protocol has a
* right to veto or force accept of the route before any filter is
* asked) and adds default values of attributes specific to the new
* protocol (metrics, tags etc.). Then it consults the protocol's
* export filter and if it accepts the route, the rt_notify() hook of
* the protocol gets called.
*/
static void
rte_announce(rtable *tab, unsigned type, net *net, rte *new, rte *old, rte *before_old, ea_list *tmpa)
{
struct announce_hook *a;
if (type == RA_OPTIMAL)
{
if (new)
new->attrs->proto->stats.pref_routes++;
if (old)
old->attrs->proto->stats.pref_routes--;
if (tab->hostcache)
rt_notify_hostcache(tab, net);
}
WALK_LIST(a, tab->hooks)
{
ASSERT(a->proto->core_state == FS_HAPPY || a->proto->core_state == FS_FEEDING);
if (a->proto->accept_ra_types == type)
if (type == RA_ACCEPTED)
rt_notify_accepted(a, net, new, old, before_old, tmpa, 0);
else
rt_notify_basic(a, net, new, old, tmpa, 0);
}
}
static inline int
rte_validate(rte *e)
{
int c;
net *n = e->net;
if ((n->n.pxlen > BITS_PER_IP_ADDRESS) || !ip_is_prefix(n->n.prefix,n->n.pxlen))
{
log(L_WARN "Ignoring bogus prefix %I/%d received via %s",
n->n.prefix, n->n.pxlen, e->sender->proto->name);
return 0;
}
c = ipa_classify_net(n->n.prefix);
if ((c < 0) || !(c & IADDR_HOST) || ((c & IADDR_SCOPE_MASK) <= SCOPE_LINK))
{
log(L_WARN "Ignoring bogus route %I/%d received via %s",
n->n.prefix, n->n.pxlen, e->sender->proto->name);
return 0;
}
return 1;
}
/**
* rte_free - delete a &rte
* @e: &rte to be deleted
*
* rte_free() deletes the given &rte from the routing table it's linked to.
*/
void
rte_free(rte *e)
{
if (e->attrs->aflags & RTAF_CACHED)
rta_free(e->attrs);
sl_free(rte_slab, e);
}
static inline void
rte_free_quick(rte *e)
{
rta_free(e->attrs);
sl_free(rte_slab, e);
}
static int
rte_same(rte *x, rte *y)
{
return
x->attrs == y->attrs &&
x->flags == y->flags &&
x->pflags == y->pflags &&
x->pref == y->pref &&
(!x->attrs->proto->rte_same || x->attrs->proto->rte_same(x, y));
}
static void
rte_recalculate(struct announce_hook *ah, net *net, rte *new, ea_list *tmpa, struct proto *src)
{
struct proto *p = ah->proto;
struct rtable *table = ah->table;
struct proto_stats *stats = ah->stats;
rte *before_old = NULL;
rte *old_best = net->routes;
rte *old = NULL;
rte **k;
k = &net->routes; /* Find and remove original route from the same protocol */
while (old = *k)
{
if (old->attrs->proto == src)
{
/* If there is the same route in the routing table but from
* a different sender, then there are two paths from the
* source protocol to this routing table through transparent
* pipes, which is not allowed.
*
* We log that and ignore the route. If it is withdraw, we
* ignore it completely (there might be 'spurious withdraws',
* see FIXME in do_rte_announce())
*/
if (old->sender->proto != p)
{
if (new)
{
log(L_ERR "Pipe collision detected when sending %I/%d to table %s",
net->n.prefix, net->n.pxlen, table->name);
rte_free_quick(new);
}
return;
}
if (new && rte_same(old, new))
{
/* No changes, ignore the new route */
stats->imp_updates_ignored++;
rte_trace_in(D_ROUTES, p, new, "ignored");
rte_free_quick(new);
#ifdef CONFIG_RIP
/* lastmod is used internally by RIP as the last time
when the route was received. */
if (src->proto == &proto_rip)
old->lastmod = now;
#endif
return;
}
*k = old->next;
break;
}
k = &old->next;
before_old = old;
}
if (!old)
before_old = NULL;
if (!old && !new)
{
stats->imp_withdraws_ignored++;
return;
}
if (new)
stats->imp_updates_accepted++;
else
stats->imp_withdraws_accepted++;
if (new)
stats->imp_routes++;
if (old)
stats->imp_routes--;
if (new)
{
for (k=&net->routes; *k; k=&(*k)->next)
if (rte_better(new, *k))
break;
new->lastmod = now;
new->next = *k;
*k = new;
rte_trace_in(D_ROUTES, p, new, net->routes == new ? "added [best]" : "added");
}
/* Log the route removal */
if (!new && (p->debug & D_ROUTES))
{
if (old != old_best)
rte_trace_in(D_ROUTES, p, old, "removed");
else if (net->routes)
rte_trace_in(D_ROUTES, p, old, "removed [replaced]");
else
rte_trace_in(D_ROUTES, p, old, "removed [sole]");
}
rte_announce(table, RA_ANY, net, new, old, NULL, tmpa);
rte_announce(table, RA_OPTIMAL, net, net->routes, old_best, NULL, tmpa);
rte_announce(table, RA_ACCEPTED, net, new, old, before_old, tmpa);
if (!net->routes &&
(table->gc_counter++ >= table->config->gc_max_ops) &&
(table->gc_time + table->config->gc_min_time <= now))
rt_schedule_gc(table);
if (old)
{
if (p->rte_remove)
p->rte_remove(net, old);
rte_free_quick(old);
}
if (new)
{
if (p->rte_insert)
p->rte_insert(net, new);
}
}
static int rte_update_nest_cnt; /* Nesting counter to allow recursive updates */
static inline void
rte_update_lock(void)
{
rte_update_nest_cnt++;
}
static inline void
rte_update_unlock(void)
{
if (!--rte_update_nest_cnt)
lp_flush(rte_update_pool);
}
/**
* rte_update - enter a new update to a routing table
* @table: table to be updated
* @ah: pointer to table announce hook
* @net: network node
* @p: protocol submitting the update
* @src: protocol originating the update
* @new: a &rte representing the new route or %NULL for route removal.
*
* This function is called by the routing protocols whenever they discover
* a new route or wish to update/remove an existing route. The right announcement
* sequence is to build route attributes first (either un-cached with @aflags set
* to zero or a cached one using rta_lookup(); in this case please note that
* you need to increase the use count of the attributes yourself by calling
* rta_clone()), call rte_get_temp() to obtain a temporary &rte, fill in all
* the appropriate data and finally submit the new &rte by calling rte_update().
*
* @src specifies the protocol that originally created the route and the meaning
* of protocol-dependent data of @new. If @new is not %NULL, @src have to be the
* same value as @new->attrs->proto. @p specifies the protocol that called
* rte_update(). In most cases it is the same protocol as @src. rte_update()
* stores @p in @new->sender;
*
* When rte_update() gets any route, it automatically validates it (checks,
* whether the network and next hop address are valid IP addresses and also
* whether a normal routing protocol doesn't try to smuggle a host or link
* scope route to the table), converts all protocol dependent attributes stored
* in the &rte to temporary extended attributes, consults import filters of the
* protocol to see if the route should be accepted and/or its attributes modified,
* stores the temporary attributes back to the &rte.
*
* Now, having a "public" version of the route, we
* automatically find any old route defined by the protocol @src
* for network @n, replace it by the new one (or removing it if @new is %NULL),
* recalculate the optimal route for this destination and finally broadcast
* the change (if any) to all routing protocols by calling rte_announce().
*
* All memory used for attribute lists and other temporary allocations is taken
* from a special linear pool @rte_update_pool and freed when rte_update()
* finishes.
*/
void
rte_update2(struct announce_hook *ah, net *net, rte *new, struct proto *src)
{
struct proto *p = ah->proto;
struct proto_stats *stats = ah->stats;
struct filter *filter = ah->in_filter;
ea_list *tmpa = NULL;
rte_update_lock();
if (new)
{
new->sender = ah;
stats->imp_updates_received++;
if (!rte_validate(new))
{
rte_trace_in(D_FILTERS, p, new, "invalid");
stats->imp_updates_invalid++;
goto drop;
}
if (filter == FILTER_REJECT)
{
stats->imp_updates_filtered++;
rte_trace_in(D_FILTERS, p, new, "filtered out");
goto drop;
}
if (src->make_tmp_attrs)
tmpa = src->make_tmp_attrs(new, rte_update_pool);
if (filter)
{
ea_list *old_tmpa = tmpa;
int fr = f_run(filter, &new, &tmpa, rte_update_pool, 0);
if (fr > F_ACCEPT)
{
stats->imp_updates_filtered++;
rte_trace_in(D_FILTERS, p, new, "filtered out");
goto drop;
}
if (tmpa != old_tmpa && src->store_tmp_attrs)
src->store_tmp_attrs(new, tmpa);
}
if (!(new->attrs->aflags & RTAF_CACHED)) /* Need to copy attributes */
new->attrs = rta_lookup(new->attrs);
new->flags |= REF_COW;
}
else
stats->imp_withdraws_received++;
rte_recalculate(ah, net, new, tmpa, src);
rte_update_unlock();
return;
drop:
rte_free(new);
rte_recalculate(ah, net, NULL, NULL, src);
rte_update_unlock();
}
/* Independent call to rte_announce(), used from next hop
recalculation, outside of rte_update(). new must be non-NULL */
static inline void
rte_announce_i(rtable *tab, unsigned type, net *n, rte *new, rte *old)
{
struct proto *src;
ea_list *tmpa;
rte_update_lock();
src = new->attrs->proto;
tmpa = src->make_tmp_attrs ? src->make_tmp_attrs(new, rte_update_pool) : NULL;
rte_announce(tab, type, n, new, old, NULL, tmpa);
rte_update_unlock();
}
void
rte_discard(rtable *t, rte *old) /* Non-filtered route deletion, used during garbage collection */
{
rte_update_lock();
rte_recalculate(old->sender, old->net, NULL, NULL, old->attrs->proto);
rte_update_unlock();
}
/**
* rte_dump - dump a route
* @e: &rte to be dumped
*
* This functions dumps contents of a &rte to debug output.
*/
void
rte_dump(rte *e)
{
net *n = e->net;
if (n)
debug("%-1I/%2d ", n->n.prefix, n->n.pxlen);
else
debug("??? ");
debug("KF=%02x PF=%02x pref=%d lm=%d ", n->n.flags, e->pflags, e->pref, now-e->lastmod);
rta_dump(e->attrs);
if (e->attrs->proto->proto->dump_attrs)
e->attrs->proto->proto->dump_attrs(e);
debug("\n");
}
/**
* rt_dump - dump a routing table
* @t: routing table to be dumped
*
* This function dumps contents of a given routing table to debug output.
*/
void
rt_dump(rtable *t)
{
rte *e;
net *n;
struct announce_hook *a;
debug("Dump of routing table <%s>\n", t->name);
#ifdef DEBUGGING
fib_check(&t->fib);
#endif
FIB_WALK(&t->fib, fn)
{
n = (net *) fn;
for(e=n->routes; e; e=e->next)
rte_dump(e);
}
FIB_WALK_END;
WALK_LIST(a, t->hooks)
debug("\tAnnounces routes to protocol %s\n", a->proto->name);
debug("\n");
}
/**
* rt_dump_all - dump all routing tables
*
* This function dumps contents of all routing tables to debug output.
*/
void
rt_dump_all(void)
{
rtable *t;
WALK_LIST(t, routing_tables)
rt_dump(t);
}
static inline void
rt_schedule_gc(rtable *tab)
{
if (tab->gc_scheduled)
return;
tab->gc_scheduled = 1;
ev_schedule(tab->rt_event);
}
static inline void
rt_schedule_hcu(rtable *tab)
{
if (tab->hcu_scheduled)
return;
tab->hcu_scheduled = 1;
ev_schedule(tab->rt_event);
}
static inline void
rt_schedule_nhu(rtable *tab)
{
if (tab->nhu_state == 0)
ev_schedule(tab->rt_event);
/* state change 0->1, 2->3 */
tab->nhu_state |= 1;
}
static void
rt_prune_nets(rtable *tab)
{
struct fib_iterator fit;
int ncnt = 0, ndel = 0;
#ifdef DEBUGGING
fib_check(&tab->fib);
#endif
FIB_ITERATE_INIT(&fit, &tab->fib);
again:
FIB_ITERATE_START(&tab->fib, &fit, f)
{
net *n = (net *) f;
ncnt++;
if (!n->routes) /* Orphaned FIB entry */
{
FIB_ITERATE_PUT(&fit, f);
fib_delete(&tab->fib, f);
ndel++;
goto again;
}
}
FIB_ITERATE_END(f);
DBG("Pruned %d of %d networks\n", ndel, ncnt);
tab->gc_counter = 0;
tab->gc_time = now;
tab->gc_scheduled = 0;
}
static void
rt_event(void *ptr)
{
rtable *tab = ptr;
if (tab->hcu_scheduled)
rt_update_hostcache(tab);
if (tab->nhu_state)
rt_next_hop_update(tab);
if (tab->gc_scheduled)
rt_prune_nets(tab);
}
void
rt_setup(pool *p, rtable *t, char *name, struct rtable_config *cf)
{
bzero(t, sizeof(*t));
fib_init(&t->fib, p, sizeof(net), 0, rte_init);
t->name = name;
t->config = cf;
init_list(&t->hooks);
if (cf)
{
t->rt_event = ev_new(p);
t->rt_event->hook = rt_event;
t->rt_event->data = t;
t->gc_time = now;
}
}
/**
* rt_init - initialize routing tables
*
* This function is called during BIRD startup. It initializes the
* routing table module.
*/
void
rt_init(void)
{
rta_init();
rt_table_pool = rp_new(&root_pool, "Routing tables");
rte_update_pool = lp_new(rt_table_pool, 4080);
rte_slab = sl_new(rt_table_pool, sizeof(rte));
init_list(&routing_tables);
}
/* Called from proto_schedule_flush_loop() only,
ensuring that all prune states are zero */
void
rt_schedule_prune_all(void)
{
rtable *t;
WALK_LIST(t, routing_tables)
t->prune_state = 1;
}
static inline int
rt_prune_step(rtable *tab, int *max_feed)
{
struct fib_iterator *fit = &tab->prune_fit;
DBG("Pruning route table %s\n", tab->name);
#ifdef DEBUGGING
fib_check(&tab->fib);
#endif
if (tab->prune_state == 0)
return 1;
if (tab->prune_state == 1)
{
FIB_ITERATE_INIT(fit, &tab->fib);
tab->prune_state = 2;
}
again:
FIB_ITERATE_START(&tab->fib, fit, fn)
{
net *n = (net *) fn;
rte *e;
rescan:
for (e=n->routes; e; e=e->next)
if (e->sender->proto->core_state != FS_HAPPY &&
e->sender->proto->core_state != FS_FEEDING)
{
if (*max_feed <= 0)
{
FIB_ITERATE_PUT(fit, fn);
return 0;
}
rte_discard(tab, e);
(*max_feed)--;
goto rescan;
}
if (!n->routes) /* Orphaned FIB entry */
{
FIB_ITERATE_PUT(fit, fn);
fib_delete(&tab->fib, fn);
goto again;
}
}
FIB_ITERATE_END(fn);
#ifdef DEBUGGING
fib_check(&tab->fib);
#endif
tab->prune_state = 0;
return 1;
}
/**
* rt_prune_loop - prune routing tables
* @tab: routing table to be pruned
*
* The prune loop scans routing tables and removes routes belonging to
* inactive protocols and also stale network entries. Returns 1 when
* all such routes are pruned. It is a part of the protocol flushing
* loop.
*/
int
rt_prune_loop(void)
{
rtable *t;
int max_feed = 512;
WALK_LIST(t, routing_tables)
if (! rt_prune_step(t, &max_feed))
return 0;
return 1;
}
void
rt_preconfig(struct config *c)
{
struct symbol *s = cf_find_symbol("master");
init_list(&c->tables);
c->master_rtc = rt_new_table(s);
}
/*
* Some functions for handing internal next hop updates
* triggered by rt_schedule_nhu().
*/
static inline int
rta_next_hop_outdated(rta *a)
{
struct hostentry *he = a->hostentry;
if (!he)
return 0;
if (!he->src)
return a->dest != RTD_UNREACHABLE;
return (a->iface != he->src->iface) || !ipa_equal(a->gw, he->gw) ||
(a->dest != he->dest) || (a->igp_metric != he->igp_metric) ||
!mpnh_same(a->nexthops, he->src->nexthops);
}
static inline void
rta_apply_hostentry(rta *a, struct hostentry *he)
{
a->hostentry = he;
a->iface = he->src ? he->src->iface : NULL;
a->gw = he->gw;
a->dest = he->dest;
a->igp_metric = he->igp_metric;
a->nexthops = he->src ? he->src->nexthops : NULL;
}
static inline rte *
rt_next_hop_update_rte(rtable *tab, rte *old)
{
rta a;
memcpy(&a, old->attrs, sizeof(rta));
rta_apply_hostentry(&a, old->attrs->hostentry);
a.aflags = 0;
rte *e = sl_alloc(rte_slab);
memcpy(e, old, sizeof(rte));
e->attrs = rta_lookup(&a);
return e;
}
static inline int
rt_next_hop_update_net(rtable *tab, net *n)
{
rte **k, *e, *new, *old_best, **new_best;
int count = 0;
int free_old_best = 0;
old_best = n->routes;
if (!old_best)
return 0;
for (k = &n->routes; e = *k; k = &e->next)
if (rta_next_hop_outdated(e->attrs))
{
new = rt_next_hop_update_rte(tab, e);
*k = new;
rte_announce_i(tab, RA_ANY, n, new, e);
rte_trace_in(D_ROUTES, new->sender->proto, new, "updated");
/* Call a pre-comparison hook */
/* Not really an efficient way to compute this */
if (e->attrs->proto->rte_recalculate)
e->attrs->proto->rte_recalculate(tab, n, new, e, NULL);
if (e != old_best)
rte_free_quick(e);
else /* Freeing of the old best rte is postponed */
free_old_best = 1;
e = new;
count++;
}
if (!count)
return 0;
/* Find the new best route */
new_best = NULL;
for (k = &n->routes; e = *k; k = &e->next)
{
if (!new_best || rte_better(e, *new_best))
new_best = k;
}
/* Relink the new best route to the first position */
new = *new_best;
if (new != n->routes)
{
*new_best = new->next;
new->next = n->routes;
n->routes = new;
}
/* Announce the new best route */
if (new != old_best)
{
rte_announce_i(tab, RA_OPTIMAL, n, new, old_best);
rte_trace_in(D_ROUTES, new->sender->proto, new, "updated [best]");
}
if (free_old_best)
rte_free_quick(old_best);
return count;
}
static void
rt_next_hop_update(rtable *tab)
{
struct fib_iterator *fit = &tab->nhu_fit;
int max_feed = 32;
if (tab->nhu_state == 0)
return;
if (tab->nhu_state == 1)
{
FIB_ITERATE_INIT(fit, &tab->fib);
tab->nhu_state = 2;
}
FIB_ITERATE_START(&tab->fib, fit, fn)
{
if (max_feed <= 0)
{
FIB_ITERATE_PUT(fit, fn);
ev_schedule(tab->rt_event);
return;
}
max_feed -= rt_next_hop_update_net(tab, (net *) fn);
}
FIB_ITERATE_END(fn);
/* state change 2->0, 3->1 */
tab->nhu_state &= 1;
if (tab->nhu_state > 0)
ev_schedule(tab->rt_event);
}
struct rtable_config *
rt_new_table(struct symbol *s)
{
struct rtable_config *c = cfg_allocz(sizeof(struct rtable_config));
cf_define_symbol(s, SYM_TABLE, c);
c->name = s->name;
add_tail(&new_config->tables, &c->n);
c->gc_max_ops = 1000;
c->gc_min_time = 5;
return c;
}
/**
* rt_lock_table - lock a routing table
* @r: routing table to be locked
*
* Lock a routing table, because it's in use by a protocol,
* preventing it from being freed when it gets undefined in a new
* configuration.
*/
void
rt_lock_table(rtable *r)
{
r->use_count++;
}
/**
* rt_unlock_table - unlock a routing table
* @r: routing table to be unlocked
*
* Unlock a routing table formerly locked by rt_lock_table(),
* that is decrease its use count and delete it if it's scheduled
* for deletion by configuration changes.
*/
void
rt_unlock_table(rtable *r)
{
if (!--r->use_count && r->deleted)
{
struct config *conf = r->deleted;
DBG("Deleting routing table %s\n", r->name);
if (r->hostcache)
rt_free_hostcache(r);
rem_node(&r->n);
fib_free(&r->fib);
rfree(r->rt_event);
mb_free(r);
config_del_obstacle(conf);
}
}
/**
* rt_commit - commit new routing table configuration
* @new: new configuration
* @old: original configuration or %NULL if it's boot time config
*
* Scan differences between @old and @new configuration and modify
* the routing tables according to these changes. If @new defines a
* previously unknown table, create it, if it omits a table existing
* in @old, schedule it for deletion (it gets deleted when all protocols
* disconnect from it by calling rt_unlock_table()), if it exists
* in both configurations, leave it unchanged.
*/
void
rt_commit(struct config *new, struct config *old)
{
struct rtable_config *o, *r;
DBG("rt_commit:\n");
if (old)
{
WALK_LIST(o, old->tables)
{
rtable *ot = o->table;
if (!ot->deleted)
{
struct symbol *sym = cf_find_symbol(o->name);
if (sym && sym->class == SYM_TABLE && !new->shutdown)
{
DBG("\t%s: same\n", o->name);
r = sym->def;
r->table = ot;
ot->name = r->name;
ot->config = r;
}
else
{
DBG("\t%s: deleted\n", o->name);
ot->deleted = old;
config_add_obstacle(old);
rt_lock_table(ot);
rt_unlock_table(ot);
}
}
}
}
WALK_LIST(r, new->tables)
if (!r->table)
{
rtable *t = mb_alloc(rt_table_pool, sizeof(struct rtable));
DBG("\t%s: created\n", r->name);
rt_setup(rt_table_pool, t, r->name, r);
add_tail(&routing_tables, &t->n);
r->table = t;
}
DBG("\tdone\n");
}
static inline void
do_feed_baby(struct proto *p, int type, struct announce_hook *h, net *n, rte *e)
{
struct proto *src = e->attrs->proto;
ea_list *tmpa;
rte_update_lock();
tmpa = src->make_tmp_attrs ? src->make_tmp_attrs(e, rte_update_pool) : NULL;
if (type == RA_ACCEPTED)
rt_notify_accepted(h, n, e, NULL, NULL, tmpa, p->refeeding ? 2 : 1);
else
rt_notify_basic(h, n, e, p->refeeding ? e : NULL, tmpa, p->refeeding);
rte_update_unlock();
}
/**
* rt_feed_baby - advertise routes to a new protocol
* @p: protocol to be fed
*
* This function performs one pass of advertisement of routes to a newly
* initialized protocol. It's called by the protocol code as long as it
* has something to do. (We avoid transferring all the routes in single
* pass in order not to monopolize CPU time.)
*/
int
rt_feed_baby(struct proto *p)
{
struct announce_hook *h;
struct fib_iterator *fit;
int max_feed = 256;
if (!p->feed_ahook) /* Need to initialize first */
{
if (!p->ahooks)
return 1;
DBG("Announcing routes to new protocol %s\n", p->name);
p->feed_ahook = p->ahooks;
fit = p->feed_iterator = mb_alloc(p->pool, sizeof(struct fib_iterator));
goto next_hook;
}
fit = p->feed_iterator;
again:
h = p->feed_ahook;
FIB_ITERATE_START(&h->table->fib, fit, fn)
{
net *n = (net *) fn;
rte *e = n->routes;
if (max_feed <= 0)
{
FIB_ITERATE_PUT(fit, fn);
return 0;
}
if (p->accept_ra_types == RA_OPTIMAL)
if (e)
{
if (p->core_state != FS_FEEDING)
return 1; /* In the meantime, the protocol fell down. */
do_feed_baby(p, RA_OPTIMAL, h, n, e);
max_feed--;
}
if (p->accept_ra_types == RA_ANY)
for(e = n->routes; e != NULL; e = e->next)
{
if (p->core_state != FS_FEEDING)
return 1; /* In the meantime, the protocol fell down. */
do_feed_baby(p, RA_ANY, h, n, e);
max_feed--;
}
}
FIB_ITERATE_END(fn);
p->feed_ahook = h->next;
if (!p->feed_ahook)
{
mb_free(p->feed_iterator);
p->feed_iterator = NULL;
return 1;
}
next_hook:
h = p->feed_ahook;
FIB_ITERATE_INIT(fit, &h->table->fib);
goto again;
}
/**
* rt_feed_baby_abort - abort protocol feeding
* @p: protocol
*
* This function is called by the protocol code when the protocol
* stops or ceases to exist before the last iteration of rt_feed_baby()
* has finished.
*/
void
rt_feed_baby_abort(struct proto *p)
{
if (p->feed_ahook)
{
/* Unlink the iterator and exit */
fit_get(&p->feed_ahook->table->fib, p->feed_iterator);
p->feed_ahook = NULL;
}
}
static inline unsigned
ptr_hash(void *ptr)
{
uintptr_t p = (uintptr_t) ptr;
return p ^ (p << 8) ^ (p >> 16);
}
static inline unsigned
hc_hash(ip_addr a, rtable *dep)
{
return (ipa_hash(a) ^ ptr_hash(dep)) & 0xffff;
}
static inline void
hc_insert(struct hostcache *hc, struct hostentry *he)
{
unsigned int k = he->hash_key >> hc->hash_shift;
he->next = hc->hash_table[k];
hc->hash_table[k] = he;
}
static inline void
hc_remove(struct hostcache *hc, struct hostentry *he)
{
struct hostentry **hep;
unsigned int k = he->hash_key >> hc->hash_shift;
for (hep = &hc->hash_table[k]; *hep != he; hep = &(*hep)->next);
*hep = he->next;
}
#define HC_DEF_ORDER 10
#define HC_HI_MARK *4
#define HC_HI_STEP 2
#define HC_HI_ORDER 16 /* Must be at most 16 */
#define HC_LO_MARK /5
#define HC_LO_STEP 2
#define HC_LO_ORDER 10
static void
hc_alloc_table(struct hostcache *hc, unsigned order)
{
unsigned hsize = 1 << order;
hc->hash_order = order;
hc->hash_shift = 16 - order;
hc->hash_max = (order >= HC_HI_ORDER) ? ~0 : (hsize HC_HI_MARK);
hc->hash_min = (order <= HC_LO_ORDER) ? 0 : (hsize HC_LO_MARK);
hc->hash_table = mb_allocz(rt_table_pool, hsize * sizeof(struct hostentry *));
}
static void
hc_resize(struct hostcache *hc, unsigned new_order)
{
unsigned old_size = 1 << hc->hash_order;
struct hostentry **old_table = hc->hash_table;
struct hostentry *he, *hen;
int i;
hc_alloc_table(hc, new_order);
for (i = 0; i < old_size; i++)
for (he = old_table[i]; he != NULL; he=hen)
{
hen = he->next;
hc_insert(hc, he);
}
mb_free(old_table);
}
static struct hostentry *
hc_new_hostentry(struct hostcache *hc, ip_addr a, ip_addr ll, rtable *dep, unsigned k)
{
struct hostentry *he = sl_alloc(hc->slab);
he->addr = a;
he->link = ll;
he->tab = dep;
he->hash_key = k;
he->uc = 0;
he->src = NULL;
add_tail(&hc->hostentries, &he->ln);
hc_insert(hc, he);
hc->hash_items++;
if (hc->hash_items > hc->hash_max)
hc_resize(hc, hc->hash_order + HC_HI_STEP);
return he;
}
static void
hc_delete_hostentry(struct hostcache *hc, struct hostentry *he)
{
rta_free(he->src);
rem_node(&he->ln);
hc_remove(hc, he);
sl_free(hc->slab, he);
hc->hash_items--;
if (hc->hash_items < hc->hash_min)
hc_resize(hc, hc->hash_order - HC_LO_STEP);
}
static void
rt_init_hostcache(rtable *tab)
{
struct hostcache *hc = mb_allocz(rt_table_pool, sizeof(struct hostcache));
init_list(&hc->hostentries);
hc->hash_items = 0;
hc_alloc_table(hc, HC_DEF_ORDER);
hc->slab = sl_new(rt_table_pool, sizeof(struct hostentry));
hc->lp = lp_new(rt_table_pool, 1008);
hc->trie = f_new_trie(hc->lp);
tab->hostcache = hc;
}
static void
rt_free_hostcache(rtable *tab)
{
struct hostcache *hc = tab->hostcache;
node *n;
WALK_LIST(n, hc->hostentries)
{
struct hostentry *he = SKIP_BACK(struct hostentry, ln, n);
rta_free(he->src);
if (he->uc)
log(L_ERR "Hostcache is not empty in table %s", tab->name);
}
rfree(hc->slab);
rfree(hc->lp);
mb_free(hc->hash_table);
mb_free(hc);
}
static void
rt_notify_hostcache(rtable *tab, net *net)
{
struct hostcache *hc = tab->hostcache;
if (tab->hcu_scheduled)
return;
if (trie_match_prefix(hc->trie, net->n.prefix, net->n.pxlen))
rt_schedule_hcu(tab);
}
static int
if_local_addr(ip_addr a, struct iface *i)
{
struct ifa *b;
WALK_LIST(b, i->addrs)
if (ipa_equal(a, b->ip))
return 1;
return 0;
}
static u32
rt_get_igp_metric(rte *rt)
{
eattr *ea = ea_find(rt->attrs->eattrs, EA_GEN_IGP_METRIC);
if (ea)
return ea->u.data;
rta *a = rt->attrs;
#ifdef CONFIG_OSPF
if ((a->source == RTS_OSPF) ||
(a->source == RTS_OSPF_IA) ||
(a->source == RTS_OSPF_EXT1))
return rt->u.ospf.metric1;
#endif
#ifdef CONFIG_RIP
if (a->source == RTS_RIP)
return rt->u.rip.metric;
#endif
/* Device routes */
if ((a->dest != RTD_ROUTER) && (a->dest != RTD_MULTIPATH))
return 0;
return IGP_METRIC_UNKNOWN;
}
static int
rt_update_hostentry(rtable *tab, struct hostentry *he)
{
rta *old_src = he->src;
int pxlen = 0;
/* Reset the hostentry */
he->src = NULL;
he->gw = IPA_NONE;
he->dest = RTD_UNREACHABLE;
he->igp_metric = 0;
net *n = net_route(tab, he->addr, MAX_PREFIX_LENGTH);
if (n)
{
rta *a = n->routes->attrs;
pxlen = n->n.pxlen;
if (a->hostentry)
{
/* Recursive route should not depend on another recursive route */
log(L_WARN "Next hop address %I resolvable through recursive route for %I/%d",
he->addr, n->n.prefix, pxlen);
goto done;
}
if (a->dest == RTD_DEVICE)
{
if (if_local_addr(he->addr, a->iface))
{
/* The host address is a local address, this is not valid */
log(L_WARN "Next hop address %I is a local address of iface %s",
he->addr, a->iface->name);
goto done;
}
/* The host is directly reachable, use link as a gateway */
he->gw = he->link;
he->dest = RTD_ROUTER;
}
else
{
/* The host is reachable through some route entry */
he->gw = a->gw;
he->dest = a->dest;
}
he->src = rta_clone(a);
he->igp_metric = rt_get_igp_metric(n->routes);
}
done:
/* Add a prefix range to the trie */
trie_add_prefix(tab->hostcache->trie, he->addr, MAX_PREFIX_LENGTH, pxlen, MAX_PREFIX_LENGTH);
rta_free(old_src);
return old_src != he->src;
}
static void
rt_update_hostcache(rtable *tab)
{
struct hostcache *hc = tab->hostcache;
struct hostentry *he;
node *n, *x;
/* Reset the trie */
lp_flush(hc->lp);
hc->trie = f_new_trie(hc->lp);
WALK_LIST_DELSAFE(n, x, hc->hostentries)
{
he = SKIP_BACK(struct hostentry, ln, n);
if (!he->uc)
{
hc_delete_hostentry(hc, he);
continue;
}
if (rt_update_hostentry(tab, he))
rt_schedule_nhu(he->tab);
}
tab->hcu_scheduled = 0;
}
static struct hostentry *
rt_find_hostentry(rtable *tab, ip_addr a, ip_addr ll, rtable *dep)
{
struct hostentry *he;
if (!tab->hostcache)
rt_init_hostcache(tab);
unsigned int k = hc_hash(a, dep);
struct hostcache *hc = tab->hostcache;
for (he = hc->hash_table[k >> hc->hash_shift]; he != NULL; he = he->next)
if (ipa_equal(he->addr, a) && (he->tab == dep))
return he;
he = hc_new_hostentry(hc, a, ll, dep, k);
rt_update_hostentry(tab, he);
return he;
}
void
rta_set_recursive_next_hop(rtable *dep, rta *a, rtable *tab, ip_addr *gw, ip_addr *ll)
{
rta_apply_hostentry(a, rt_find_hostentry(tab, *gw, *ll, dep));
}
/*
* CLI commands
*/
static void
rt_format_via(rte *e, byte *via)
{
rta *a = e->attrs;
switch (a->dest)
{
case RTD_ROUTER: bsprintf(via, "via %I on %s", a->gw, a->iface->name); break;
case RTD_DEVICE: bsprintf(via, "dev %s", a->iface->name); break;
case RTD_BLACKHOLE: bsprintf(via, "blackhole"); break;
case RTD_UNREACHABLE: bsprintf(via, "unreachable"); break;
case RTD_PROHIBIT: bsprintf(via, "prohibited"); break;
case RTD_MULTIPATH: bsprintf(via, "multipath"); break;
default: bsprintf(via, "???");
}
}
static void
rt_show_rte(struct cli *c, byte *ia, rte *e, struct rt_show_data *d, ea_list *tmpa)
{
byte via[STD_ADDRESS_P_LENGTH+32], from[STD_ADDRESS_P_LENGTH+8];
byte tm[TM_DATETIME_BUFFER_SIZE], info[256];
rta *a = e->attrs;
int primary = (e->net->routes == e);
int sync_error = (e->net->n.flags & KRF_SYNC_ERROR);
struct mpnh *nh;
rt_format_via(e, via);
tm_format_datetime(tm, &config->tf_route, e->lastmod);
if (ipa_nonzero(a->from) && !ipa_equal(a->from, a->gw))
bsprintf(from, " from %I", a->from);
else
from[0] = 0;
if (a->proto->proto->get_route_info || d->verbose)
{
/* Need to normalize the extended attributes */
ea_list *t = tmpa;
t = ea_append(t, a->eattrs);
tmpa = alloca(ea_scan(t));
ea_merge(t, tmpa);
ea_sort(tmpa);
}
if (a->proto->proto->get_route_info)
a->proto->proto->get_route_info(e, info, tmpa);
else
bsprintf(info, " (%d)", e->pref);
cli_printf(c, -1007, "%-18s %s [%s %s%s]%s%s", ia, via, a->proto->name,
tm, from, primary ? (sync_error ? " !" : " *") : "", info);
for (nh = a->nexthops; nh; nh = nh->next)
cli_printf(c, -1007, "\tvia %I on %s weight %d", nh->gw, nh->iface->name, nh->weight + 1);
if (d->verbose)
rta_show(c, a, tmpa);
}
static void
rt_show_net(struct cli *c, net *n, struct rt_show_data *d)
{
rte *e, *ee;
byte ia[STD_ADDRESS_P_LENGTH+8];
struct announce_hook *a;
int ok;
bsprintf(ia, "%I/%d", n->n.prefix, n->n.pxlen);
if (n->routes)
d->net_counter++;
for(e=n->routes; e; e=e->next)
{
struct ea_list *tmpa, *old_tmpa;
struct proto *p0 = e->attrs->proto;
struct proto *p1 = d->export_protocol;
struct proto *p2 = d->show_protocol;
d->rt_counter++;
ee = e;
rte_update_lock(); /* We use the update buffer for filtering */
old_tmpa = tmpa = p0->make_tmp_attrs ? p0->make_tmp_attrs(e, rte_update_pool) : NULL;
ok = (d->filter == FILTER_ACCEPT || f_run(d->filter, &e, &tmpa, rte_update_pool, FF_FORCE_TMPATTR) <= F_ACCEPT);
if (p2 && p2 != p0) ok = 0;
if (ok && d->export_mode)
{
int ic;
if ((ic = p1->import_control ? p1->import_control(p1, &e, &tmpa, rte_update_pool) : 0) < 0)
ok = 0;
else if (!ic && d->export_mode > 1)
{
/* FIXME - this shows what should be exported according
to current filters, but not what was really exported.
'configure soft' command may change the export filter
and do not update routes */
if ((a = proto_find_announce_hook(p1, d->table)) && ((a->out_filter == FILTER_REJECT) ||
(a->out_filter && f_run(a->out_filter, &e, &tmpa, rte_update_pool, FF_FORCE_TMPATTR) > F_ACCEPT)))
ok = 0;
}
}
if (ok)
{
d->show_counter++;
if (d->stats < 2)
rt_show_rte(c, ia, e, d, tmpa);
ia[0] = 0;
}
if (e != ee)
{
rte_free(e);
e = ee;
}
rte_update_unlock();
if (d->primary_only)
break;
}
}
static void
rt_show_cont(struct cli *c)
{
struct rt_show_data *d = c->rover;
#ifdef DEBUGGING
unsigned max = 4;
#else
unsigned max = 64;
#endif
struct fib *fib = &d->table->fib;
struct fib_iterator *it = &d->fit;
FIB_ITERATE_START(fib, it, f)
{
net *n = (net *) f;
if (d->running_on_config && d->running_on_config != config)
{
cli_printf(c, 8004, "Stopped due to reconfiguration");
goto done;
}
if (d->export_protocol &&
d->export_protocol->core_state != FS_HAPPY &&
d->export_protocol->core_state != FS_FEEDING)
{
cli_printf(c, 8005, "Protocol is down");
goto done;
}
if (!max--)
{
FIB_ITERATE_PUT(it, f);
return;
}
rt_show_net(c, n, d);
}
FIB_ITERATE_END(f);
if (d->stats)
cli_printf(c, 14, "%d of %d routes for %d networks", d->show_counter, d->rt_counter, d->net_counter);
else
cli_printf(c, 0, "");
done:
c->cont = c->cleanup = NULL;
}
static void
rt_show_cleanup(struct cli *c)
{
struct rt_show_data *d = c->rover;
/* Unlink the iterator */
fit_get(&d->table->fib, &d->fit);
}
void
rt_show(struct rt_show_data *d)
{
net *n;
if (d->pxlen == 256)
{
FIB_ITERATE_INIT(&d->fit, &d->table->fib);
this_cli->cont = rt_show_cont;
this_cli->cleanup = rt_show_cleanup;
this_cli->rover = d;
}
else
{
if (d->show_for)
n = net_route(d->table, d->prefix, d->pxlen);
else
n = net_find(d->table, d->prefix, d->pxlen);
if (n)
{
rt_show_net(this_cli, n, d);
cli_msg(0, "");
}
else
cli_msg(8001, "Network not in table");
}
}
/*
* Documentation for functions declared inline in route.h
*/
#if 0
/**
* net_find - find a network entry
* @tab: a routing table
* @addr: address of the network
* @len: length of the network prefix
*
* net_find() looks up the given network in routing table @tab and
* returns a pointer to its &net entry or %NULL if no such network
* exists.
*/
static inline net *net_find(rtable *tab, ip_addr addr, unsigned len)
{ DUMMY; }
/**
* net_get - obtain a network entry
* @tab: a routing table
* @addr: address of the network
* @len: length of the network prefix
*
* net_get() looks up the given network in routing table @tab and
* returns a pointer to its &net entry. If no such entry exists, it's
* created.
*/
static inline net *net_get(rtable *tab, ip_addr addr, unsigned len)
{ DUMMY; }
/**
* rte_cow - copy a route for writing
* @r: a route entry to be copied
*
* rte_cow() takes a &rte and prepares it for modification. The exact action
* taken depends on the flags of the &rte -- if it's a temporary entry, it's
* just returned unchanged, else a new temporary entry with the same contents
* is created.
*
* The primary use of this function is inside the filter machinery -- when
* a filter wants to modify &rte contents (to change the preference or to
* attach another set of attributes), it must ensure that the &rte is not
* shared with anyone else (and especially that it isn't stored in any routing
* table).
*
* Result: a pointer to the new writable &rte.
*/
static inline rte * rte_cow(rte *r)
{ DUMMY; }
#endif
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