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Fixes several minor bugs in kernel syncer.

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This commit is contained in:
Ondrej Zajicek 2012-03-25 19:44:14 +02:00
parent 9ba2798c65
commit c9df01d321
5 changed files with 117 additions and 38 deletions
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2
doc/bird.sgml
View File

@ -1618,7 +1618,7 @@ kernel table.
<p>Because the kernel protocol is partially integrated with the
connected routing table, there are two limitations - it is not
possible to connect more kernel protocols to the same routing table
and changing route attributes (even the kernel ones) in an export
and changing route destination/gateway in an export
filter of a kernel protocol does not work. Both limitations can be
overcome using another routing table and the pipe protocol.

3
sysdep/bsd/krt-sock.c
View File

@ -189,7 +189,8 @@ krt_sock_send(int cmd, rte *e)
}
void
krt_set_notify(struct krt_proto *p UNUSED, net *n, rte *new, rte *old)
krt_set_notify(struct krt_proto *p UNUSED, net *n, rte *new, rte *old,
struct ea_list *eattrs UNUSED)
{
int err = 0;

28
sysdep/linux/netlink/netlink.c
View File

@ -612,7 +612,7 @@ nh_bufsize(struct mpnh *nh)
}
static int
nl_send_route(struct krt_proto *p, rte *e, int new)
nl_send_route(struct krt_proto *p, rte *e, struct ea_list *eattrs, int new)
{
eattr *ea;
net *net = e->net;
@ -639,13 +639,18 @@ nl_send_route(struct krt_proto *p, rte *e, int new)
r.r.rtm_scope = RT_SCOPE_UNIVERSE;
nl_add_attr_ipa(&r.h, sizeof(r), RTA_DST, net->n.prefix);
if (ea = ea_find(a->eattrs, EA_KRT_METRIC))
nl_add_attr_u32(&r.h, sizeof(r), RTA_PRIORITY, ea->u.data);
u32 metric = 0;
if (new && e->attrs->source == RTS_INHERIT)
metric = e->u.krt.metric;
if (ea = ea_find(eattrs, EA_KRT_METRIC))
metric = ea->u.data;
if (metric != 0)
nl_add_attr_u32(&r.h, sizeof(r), RTA_PRIORITY, metric);
if (ea = ea_find(a->eattrs, EA_KRT_PREFSRC))
if (ea = ea_find(eattrs, EA_KRT_PREFSRC))
nl_add_attr_ipa(&r.h, sizeof(r), RTA_PREFSRC, *(ip_addr *)ea->u.ptr->data);
if (ea = ea_find(a->eattrs, EA_KRT_REALM))
if (ea = ea_find(eattrs, EA_KRT_REALM))
nl_add_attr_u32(&r.h, sizeof(r), RTA_FLOW, ea->u.data);
switch (a->dest)
@ -686,15 +691,22 @@ nl_send_route(struct krt_proto *p, rte *e, int new)
}
void
krt_set_notify(struct krt_proto *p, net *n, rte *new, rte *old)
krt_set_notify(struct krt_proto *p, net *n, rte *new, rte *old, struct ea_list *eattrs)
{
int err = 0;
/*
* NULL for eattr of the old route is a little hack, but we don't
* get proper eattrs for old in rt_notify() anyway. NULL means no
* extended route attributes and therefore matches if the kernel
* route has any of them.
*/
if (old)
nl_send_route(p, old, 0);
nl_send_route(p, old, NULL, 0);
if (new)
err = nl_send_route(p, new, 1);
err = nl_send_route(p, new, eattrs, 1);
if (err < 0)
n->n.flags |= KRF_SYNC_ERROR;

118
sysdep/unix/krt.c
View File

@ -46,6 +46,7 @@
#include "nest/iface.h"
#include "nest/route.h"
#include "nest/protocol.h"
#include "filter/filter.h"
#include "lib/timer.h"
#include "conf/conf.h"
#include "lib/string.h"
@ -53,18 +54,18 @@
#include "unix.h"
#include "krt.h"
static int krt_uptodate(rte *k, rte *e);
/*
* Global resources
*/
pool *krt_pool;
static linpool *krt_filter_lp;
void
krt_io_init(void)
{
krt_pool = rp_new(&root_pool, "Kernel Syncer");
krt_filter_lp = lp_new(krt_pool, 4080);
krt_if_io_init();
}
@ -278,12 +279,30 @@ krt_trace_in_rl(struct rate_limit *rl, struct krt_proto *p, rte *e, char *msg)
static struct rate_limit rl_alien_seen, rl_alien_updated, rl_alien_created, rl_alien_ignored;
/*
* krt_same_key() specifies what (aside from the net) is the key in
* kernel routing tables. It should be OS-dependent, this is for
* Linux. It is important for asynchronous alien updates, because a
* positive update is implicitly a negative one for any old route with
* the same key.
*/
static inline int
krt_same_key(rte *a, rte *b)
{
return a->u.krt.proto == b->u.krt.proto &&
a->u.krt.metric == b->u.krt.metric &&
a->u.krt.type == b->u.krt.type;
return a->u.krt.metric == b->u.krt.metric;
}
static inline int
krt_uptodate(rte *a, rte *b)
{
if (a->attrs != b->attrs)
return 0;
if (a->u.krt.proto != b->u.krt.proto)
return 0;
return 1;
}
static void
@ -308,6 +327,7 @@ krt_learn_announce_delete(struct krt_proto *p, net *n)
rte_update(p->p.table, n, &p->p, &p->p, NULL);
}
/* Called when alien route is discovered during scan */
static void
krt_learn_scan(struct krt_proto *p, rte *e)
{
@ -315,7 +335,7 @@ krt_learn_scan(struct krt_proto *p, rte *e)
net *n = net_get(&p->krt_table, n0->n.prefix, n0->n.pxlen);
rte *m, **mm;
e->attrs->source = RTS_INHERIT;
e->attrs = rta_lookup(e->attrs);
for(mm=&n->routes; m = *mm; mm=&m->next)
if (krt_same_key(m, e))
@ -340,7 +360,6 @@ krt_learn_scan(struct krt_proto *p, rte *e)
krt_trace_in_rl(&rl_alien_created, p, e, "[alien] created");
if (!m)
{
e->attrs = rta_lookup(e->attrs);
e->next = n->routes;
n->routes = e;
e->u.krt.seen = 1;
@ -416,7 +435,7 @@ krt_learn_async(struct krt_proto *p, rte *e, int new)
net *n = net_get(&p->krt_table, n0->n.prefix, n0->n.pxlen);
rte *g, **gg, *best, **bestp, *old_best;
e->attrs->source = RTS_INHERIT;
e->attrs = rta_lookup(e->attrs);
old_best = n->routes;
for(gg=&n->routes; g = *gg; gg = &g->next)
@ -438,7 +457,7 @@ krt_learn_async(struct krt_proto *p, rte *e, int new)
}
else
krt_trace_in(p, e, "[alien async] created");
e->attrs = rta_lookup(e->attrs);
e->next = n->routes;
n->routes = e;
}
@ -538,7 +557,8 @@ krt_flush_routes(struct krt_proto *p)
if ((n->n.flags & KRF_INSTALLED) &&
a->source != RTS_DEVICE && a->source != RTS_INHERIT)
{
krt_set_notify(p, e->net, NULL, e);
/* FIXME: this does not work if gw is changed in export filter */
krt_set_notify(p, e->net, NULL, e, NULL);
n->n.flags &= ~KRF_INSTALLED;
}
}
@ -547,7 +567,7 @@ krt_flush_routes(struct krt_proto *p)
}
static int
krt_uptodate(rte *k, rte *e)
krt_same_dest(rte *k, rte *e)
{
rta *ka = k->attrs, *ea = e->attrs;
@ -559,6 +579,8 @@ krt_uptodate(rte *k, rte *e)
return ipa_equal(ka->gw, ea->gw);
case RTD_DEVICE:
return !strcmp(ka->iface->name, ea->iface->name);
case RTD_MULTIPATH:
return mpnh_same(ka->nexthops, ea->nexthops);
default:
return 1;
}
@ -611,10 +633,12 @@ krt_got_route(struct krt_proto *p, rte *e)
old = net->routes;
if ((net->n.flags & KRF_INSTALLED) && old)
{
if (krt_uptodate(e, old))
verdict = KRF_SEEN;
else
/* There may be changes in route attributes, we ignore that.
Also, this does not work well if gw is changed in export filter */
if ((net->n.flags & KRF_SYNC_ERROR) || ! krt_same_dest(e, old))
verdict = KRF_UPDATE;
else
verdict = KRF_SEEN;
}
else
verdict = KRF_DELETE;
@ -624,7 +648,7 @@ krt_got_route(struct krt_proto *p, rte *e)
net->n.flags = (net->n.flags & ~KRF_VERDICT_MASK) | verdict;
if (verdict == KRF_UPDATE || verdict == KRF_DELETE)
{
/* Get a cached copy of attributes and link the route */
/* Get a cached copy of attributes and temporarily link the route */
rta *a = e->attrs;
a->source = RTS_DUMMY;
e->attrs = rta_lookup(a);
@ -635,6 +659,25 @@ krt_got_route(struct krt_proto *p, rte *e)
rte_free(e);
}
static inline int
krt_export_rte(struct krt_proto *p, rte **new, ea_list **tmpa)
{
struct filter *filter = p->p.out_filter;
if (! *new)
return 0;
if (filter == FILTER_REJECT)
return 0;
if (filter == FILTER_ACCEPT)
return 1;
struct proto *src = (*new)->attrs->proto;
*tmpa = src->make_tmp_attrs ? src->make_tmp_attrs(*new, krt_filter_lp) : NULL;
return f_run(filter, new, tmpa, krt_filter_lp, FF_FORCE_TMPATTR) <= F_ACCEPT;
}
static void
krt_prune(struct krt_proto *p)
{
@ -645,16 +688,28 @@ krt_prune(struct krt_proto *p)
{
net *n = (net *) f;
int verdict = f->flags & KRF_VERDICT_MASK;
rte *new, *old;
rte *new, *new0, *old;
ea_list *tmpa = NULL;
if (verdict != KRF_CREATE && verdict != KRF_SEEN && verdict != KRF_IGNORE)
if (verdict == KRF_UPDATE || verdict == KRF_DELETE)
{
/* Get a dummy route from krt_got_route() */
old = n->routes;
n->routes = old->next;
}
else
old = NULL;
new = n->routes;
new = new0 = n->routes;
if (verdict == KRF_CREATE || verdict == KRF_UPDATE)
{
/* We have to run export filter to get proper 'new' route */
if (! krt_export_rte(p, &new, &tmpa))
{
/* Route rejected, should not happen (KRF_INSTALLED) but to be sure .. */
verdict = (verdict == KRF_CREATE) ? KRF_IGNORE : KRF_DELETE;
}
}
switch (verdict)
{
@ -662,7 +717,7 @@ krt_prune(struct krt_proto *p)
if (new && (f->flags & KRF_INSTALLED))
{
krt_trace_in(p, new, "reinstalling");
krt_set_notify(p, n, new, NULL);
krt_set_notify(p, n, new, NULL, tmpa);
}
break;
case KRF_SEEN:
@ -671,17 +726,21 @@ krt_prune(struct krt_proto *p)
break;
case KRF_UPDATE:
krt_trace_in(p, new, "updating");
krt_set_notify(p, n, new, old);
krt_set_notify(p, n, new, old, tmpa);
break;
case KRF_DELETE:
krt_trace_in(p, old, "deleting");
krt_set_notify(p, n, NULL, old);
krt_set_notify(p, n, NULL, old, NULL);
break;
default:
bug("krt_prune: invalid route status");
}
if (old)
rte_free(old);
if (new != new0)
rte_free(new);
lp_flush(krt_filter_lp);
f->flags &= ~KRF_VERDICT_MASK;
}
FIB_WALK_END;
@ -707,7 +766,7 @@ krt_got_route_async(struct krt_proto *p, rte *e, int new)
if (new)
{
krt_trace_in(p, e, "[redirect] deleting");
krt_set_notify(p, net, NULL, e);
krt_set_notify(p, net, NULL, e, NULL);
}
/* If !new, it is probably echo of our deletion */
break;
@ -781,7 +840,7 @@ krt_import_control(struct proto *P, rte **new, ea_list **attrs, struct linpool *
static void
krt_notify(struct proto *P, struct rtable *table UNUSED, net *net,
rte *new, rte *old, struct ea_list *attrs UNUSED)
rte *new, rte *old, struct ea_list *eattrs)
{
struct krt_proto *p = (struct krt_proto *) P;
@ -794,7 +853,7 @@ krt_notify(struct proto *P, struct rtable *table UNUSED, net *net,
else
net->n.flags &= ~KRF_INSTALLED;
if (p->initialized) /* Before first scan we don't touch the routes */
krt_set_notify(p, net, new, old);
krt_set_notify(p, net, new, old, eattrs);
}
/*
@ -908,7 +967,7 @@ krt_shutdown(struct proto *P)
}
static struct ea_list *
krt_make_tmp_attrs(struct rte *rt, struct linpool *pool)
krt_make_tmp_attrs(rte *rt, struct linpool *pool)
{
struct ea_list *l = lp_alloc(pool, sizeof(struct ea_list) + 2 * sizeof(eattr));
@ -930,12 +989,18 @@ krt_make_tmp_attrs(struct rte *rt, struct linpool *pool)
}
static void
krt_store_tmp_attrs(struct rte *rt, struct ea_list *attrs)
krt_store_tmp_attrs(rte *rt, struct ea_list *attrs)
{
/* EA_KRT_SOURCE is read-only */
rt->u.krt.metric = ea_get_int(attrs, EA_KRT_METRIC, 0);
}
static int
krt_rte_same(rte *a, rte *b)
{
/* src is always KRT_SRC_ALIEN and type is irrelevant */
return (a->u.krt.proto == b->u.krt.proto) && (a->u.krt.metric == b->u.krt.metric);
}
static struct proto *
krt_init(struct proto_config *c)
@ -947,6 +1012,7 @@ krt_init(struct proto_config *c)
p->p.store_tmp_attrs = krt_store_tmp_attrs;
p->p.import_control = krt_import_control;
p->p.rt_notify = krt_notify;
p->p.rte_same = krt_rte_same;
return &p->p;
}

2
sysdep/unix/krt.h
View File

@ -132,7 +132,7 @@ void krt_set_start(struct krt_proto *, int);
void krt_set_shutdown(struct krt_proto *, int);
int krt_capable(rte *e);
void krt_set_notify(struct krt_proto *x, net *net, rte *new, rte *old);
void krt_set_notify(struct krt_proto *p, net *n, rte *new, rte *old, struct ea_list *eattrs);
/* krt-iface.c */