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rt-table: Fix kernel protocol export filter memory bug

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Kernel protocol calls rt_export_merged(), which used @rte_update_pool for
temporary allocations, supposing it is called from other functions from
rt-table.c that handles locking and flushing of the linpool. Therefore,
linpool was not flushed properly and memory leaked.

Add linpool argument to rt_export_merged() and use @krt_filter_lp when
called from kernel protocol.

Thanks to Justin Cattle and Alexander Frolkin for the bugreport.

(Commit squashed and updated by Ondrej Zajicek)
This commit is contained in:
Pavel Tvrdik 2016-09-06 17:08:45 +02:00 committed by Ondrej Zajicek (work)
parent bc00f05815
commit a290da25a1
3 changed files with 21 additions and 15 deletions
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2
nest/route.h
View file

@ -276,7 +276,7 @@ void rte_update2(struct announce_hook *ah, net *net, rte *new, struct rte_src *s
static inline void rte_update(struct proto *p, net *net, rte *new) { rte_update2(p->main_ahook, net, new, p->main_source); }
void rte_discard(rtable *tab, rte *old);
int rt_examine(rtable *t, ip_addr prefix, int pxlen, struct proto *p, struct filter *filter);
rte *rt_export_merged(struct announce_hook *ah, net *net, rte **rt_free, struct ea_list **tmpa, int silent);
rte *rt_export_merged(struct announce_hook *ah, net *net, rte **rt_free, struct ea_list **tmpa, linpool *pool, int silent);
void rt_refresh_begin(rtable *t, struct announce_hook *ah);
void rt_refresh_end(rtable *t, struct announce_hook *ah);
void rte_dump(rte *);

32
nest/rt-table.c
View file

@ -245,7 +245,7 @@ rte_trace_out(uint flag, struct proto *p, rte *e, char *msg)
}
static rte *
export_filter(struct announce_hook *ah, rte *rt0, rte **rt_free, ea_list **tmpa, int silent)
export_filter_(struct announce_hook *ah, rte *rt0, rte **rt_free, ea_list **tmpa, linpool *pool, int silent)
{
struct proto *p = ah->proto;
struct filter *filter = ah->out_filter;
@ -260,9 +260,9 @@ export_filter(struct announce_hook *ah, rte *rt0, rte **rt_free, ea_list **tmpa,
if (!tmpa)
tmpa = &tmpb;
*tmpa = make_tmp_attrs(rt, rte_update_pool);
*tmpa = make_tmp_attrs(rt, pool);
v = p->import_control ? p->import_control(p, &rt, tmpa, rte_update_pool) : 0;
v = p->import_control ? p->import_control(p, &rt, tmpa, pool) : 0;
if (v < 0)
{
if (silent)
@ -281,7 +281,7 @@ export_filter(struct announce_hook *ah, rte *rt0, rte **rt_free, ea_list **tmpa,
}
v = filter && ((filter == FILTER_REJECT) ||
(f_run(filter, &rt, tmpa, rte_update_pool, FF_FORCE_TMPATTR) > F_ACCEPT));
(f_run(filter, &rt, tmpa, pool, FF_FORCE_TMPATTR) > F_ACCEPT));
if (v)
{
if (silent)
@ -304,6 +304,12 @@ export_filter(struct announce_hook *ah, rte *rt0, rte **rt_free, ea_list **tmpa,
return NULL;
}
static inline rte *
export_filter(struct announce_hook *ah, rte *rt0, rte **rt_free, ea_list **tmpa, int silent)
{
return export_filter_(ah, rt0, rt_free, tmpa, rte_update_pool, silent);
}
static void
do_rt_notify(struct announce_hook *ah, net *net, rte *new, rte *old, ea_list *tmpa, int refeed)
{
@ -586,7 +592,7 @@ rt_notify_accepted(struct announce_hook *ah, net *net, rte *new_changed, rte *ol
static struct mpnh *
mpnh_merge_rta(struct mpnh *nhs, rta *a, int max)
mpnh_merge_rta(struct mpnh *nhs, rta *a, linpool *pool, int max)
{
struct mpnh nh = { .gw = a->gw, .iface = a->iface };
struct mpnh *nh2 = (a->dest == RTD_MULTIPATH) ? a->nexthops : &nh;
@ -594,7 +600,7 @@ mpnh_merge_rta(struct mpnh *nhs, rta *a, int max)
}
rte *
rt_export_merged(struct announce_hook *ah, net *net, rte **rt_free, ea_list **tmpa, int silent)
rt_export_merged(struct announce_hook *ah, net *net, rte **rt_free, ea_list **tmpa, linpool *pool, int silent)
{
// struct proto *p = ah->proto;
struct mpnh *nhs = NULL;
@ -606,7 +612,7 @@ rt_export_merged(struct announce_hook *ah, net *net, rte **rt_free, ea_list **tm
if (!rte_is_valid(best0))
return NULL;
best = export_filter(ah, best0, rt_free, tmpa, silent);
best = export_filter_(ah, best0, rt_free, tmpa, pool, silent);
if (!best || !rte_is_reachable(best))
return best;
@ -616,13 +622,13 @@ rt_export_merged(struct announce_hook *ah, net *net, rte **rt_free, ea_list **tm
if (!rte_mergable(best0, rt0))
continue;
rt = export_filter(ah, rt0, &tmp, NULL, 1);
rt = export_filter_(ah, rt0, &tmp, NULL, pool, 1);
if (!rt)
continue;
if (rte_is_reachable(rt))
nhs = mpnh_merge_rta(nhs, rt->attrs, ah->proto->merge_limit);
nhs = mpnh_merge_rta(nhs, rt->attrs, pool, ah->proto->merge_limit);
if (tmp)
rte_free(tmp);
@ -630,11 +636,11 @@ rt_export_merged(struct announce_hook *ah, net *net, rte **rt_free, ea_list **tm
if (nhs)
{
nhs = mpnh_merge_rta(nhs, best->attrs, ah->proto->merge_limit);
nhs = mpnh_merge_rta(nhs, best->attrs, pool, ah->proto->merge_limit);
if (nhs->next)
{
best = rte_cow_rta(best, rte_update_pool);
best = rte_cow_rta(best, pool);
best->attrs->dest = RTD_MULTIPATH;
best->attrs->nexthops = nhs;
}
@ -685,7 +691,7 @@ rt_notify_merged(struct announce_hook *ah, net *net, rte *new_changed, rte *old_
/* Prepare new merged route */
if (new_best)
new_best = rt_export_merged(ah, net, &new_best_free, &tmpa, 0);
new_best = rt_export_merged(ah, net, &new_best_free, &tmpa, rte_update_pool, 0);
/* Prepare old merged route (without proper merged next hops) */
/* There are some issues with running filter on old route - see rt_notify_basic() */
@ -2470,7 +2476,7 @@ rt_show_net(struct cli *c, net *n, struct rt_show_data *d)
if ((d->export_mode == RSEM_EXPORT) && (d->export_protocol->accept_ra_types == RA_MERGED))
{
rte *rt_free;
e = rt_export_merged(a, n, &rt_free, &tmpa, 1);
e = rt_export_merged(a, n, &rt_free, &tmpa, rte_update_pool, 1);
pass = 1;
if (!e)

2
sysdep/unix/krt.c
View file

@ -613,7 +613,7 @@ krt_export_net(struct krt_proto *p, net *net, rte **rt_free, ea_list **tmpa)
rte *rt;
if (p->p.accept_ra_types == RA_MERGED)
return rt_export_merged(ah, net, rt_free, tmpa, 1);
return rt_export_merged(ah, net, rt_free, tmpa, krt_filter_lp, 1);
rt = net->routes;
*rt_free = NULL;