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f_run gets one more parameter to distinguish between in and out modes.

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This commit is contained in:
Pavel Machek 2000-03-29 09:02:00 +00:00
parent 8d2e3eba92
commit 0a06a9b8b3
4 changed files with 75 additions and 8 deletions
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58
filter/config.Y
View File

@ -9,6 +9,64 @@
FIXME (for BGP): whole system of paths, path ~ string, path.prepend(), path.originate
FIXME: create community lists
FIXME: IP addresses in ipv6
(1) Cesty
AS paths budtez interne reprezentovany stejne jako v BGP (viz RFC 1771),
to znamena jako posloupnost segmentu, z nichz kazdy je budto posloupnost nebo
mnozina cisel ASu. Na cestach nadefinuji nasledujici operace:
- zformatovani do stringu
- append dalsiho AS k ceste
Filtry by mely podporovat:
- operator pridani AS k ceste
- matchovani na pritomnost podposloupnosti v ceste (pricemz vyskytne-li
se tam mnozina, tak si ji lze predstavit prerovnanou v libovolnem
poradi)
- operator zjisteni delky cesty (pro vypocet metrik)
Byl bych rad, kdyby se samotne matchovaci funkce objevily v proto/bgp/attrs.c.
(2) Community-listy
Community list budiz interne reprezentovan jako posloupnost 32-bitovych cisel.
Filtry by se mely na communities divat jako na usporadane dvojice 16-bitovych
cisel (prvni je cislo AS, ktery community definoval, druhe pak community ID
v ramci AS) a melo by byt mozne definovat si konstanty typu community.
K dispozici by mely byt nasledujici operace:
- zjisteni pritomnosti community v listu
- pridani community do listu
- odebrani community z listu
- zresetovani listu
Pro operace na cestach i na community listech by se mela pouzivat `teckova'
notace pouzita v mem puvodnim navrhu syntaxe.
(3) Zmeny v semantice dynamickych atributu
Aby se nemusely neustale kopirovat seznamy atributu, rad bych provedl jeste
jednu zmenu v tom, jak filtry nakladaji s atributy (pevne doufam, ze posledni,
ale uznavam, ze u te predchozi jsem to take tvrdil): Funkci f_run budiz
pridan jeste jeden parametr, ktery prepina mezi dvema mody:
(a) [incoming filter mode] Jako nyni.
(b) [outgoing filter mode] Pokud se hleda atribut, hleda se nejdrive
v tmp_attrs a pokud to selze, tak v rta->attrs. Pokud se nastavuje,
dava se _vzdy_ do tmp_attrs.
Diky tomu filtry pri exportu routes nebudou vubec muset modifikovat rta a
protokoly, ktere v import_control potrebuji nastavovat i non-temporary
atributy, je budou moci pridat do tmp_attrs, aniz by sahly na rta.
*/
CF_HDR

13
filter/filter.c
View File

@ -145,6 +145,7 @@ val_print(struct f_val v)
static struct rte **f_rte, *f_rte_old;
static struct linpool *f_pool;
static struct ea_list **f_tmp_attrs;
static int f_flags;
#define runtime(x) do { \
log( L_ERR x ); \
@ -329,9 +330,14 @@ interpret(struct f_inst *what)
break;
case P('e','a'): /* Access to extended attributes */
{
eattr *e = ea_find( (*f_rte)->attrs->eattrs, what->a2.i );
eattr *e = NULL;
if (!(f_flags & FF_OUTGOING))
e = ea_find( (*f_rte)->attrs->eattrs, what->a2.i );
if (!e)
e = ea_find( (*f_tmp_attrs), what->a2.i );
if ((!e) && (f_flags & FF_OUTGOING))
e = ea_find( (*f_rte)->attrs->eattrs, what->a2.i );
if (!e) {
res.type = T_VOID;
break;
@ -371,7 +377,7 @@ interpret(struct f_inst *what)
break;
}
if (!(what->aux & EAF_TEMP)) {
if (!(what->aux & EAF_TEMP) && (!(f_flags & FF_OUTGOING))) {
*f_rte = rte_do_cow(*f_rte);
l->next = (*f_rte)->attrs->eattrs;
(*f_rte)->attrs->eattrs = l;
@ -523,12 +529,13 @@ i_same(struct f_inst *f1, struct f_inst *f2)
}
int
f_run(struct filter *filter, struct rte **rte, struct ea_list **tmp_attrs, struct linpool *tmp_pool)
f_run(struct filter *filter, struct rte **rte, struct ea_list **tmp_attrs, struct linpool *tmp_pool, int flags)
{
struct f_inst *inst;
struct f_val res;
DBG( "Running filter `%s'...", filter->name );
f_flags = flags;
f_tmp_attrs = tmp_attrs;
f_rte = rte;
f_rte_old = *rte;

4
filter/filter.h
View File

@ -67,7 +67,7 @@ int same_tree(struct f_tree *t1, struct f_tree *t2);
struct ea_list;
struct rte;
int f_run(struct filter *filter, struct rte **rte, struct ea_list **tmp_attrs, struct linpool *tmp_pool);
int f_run(struct filter *filter, struct rte **rte, struct ea_list **tmp_attrs, struct linpool *tmp_pool, int flags);
char *filter_name(struct filter *filter);
int filter_same(struct filter *new, struct filter *old);
@ -122,4 +122,6 @@ struct f_tree {
#define NEW_F_VAL struct f_val * val; val = cfg_alloc(sizeof(struct f_val));
#define FF_OUTGOING 1
#endif

8
nest/rt-table.c
View File

@ -141,7 +141,7 @@ do_rte_announce(struct announce_hook *a, net *net, rte *new, rte *old, ea_list *
else if (ok)
rte_trace_out(D_FILTERS, p, new, "forced accept by protocol");
else if (p->out_filter == FILTER_REJECT ||
p->out_filter && f_run(p->out_filter, &new, &tmpa, rte_update_pool) > F_ACCEPT)
p->out_filter && f_run(p->out_filter, &new, &tmpa, rte_update_pool, 0) > F_ACCEPT)
{
rte_trace_out(D_FILTERS, p, new, "filtered out");
new = NULL;
@ -155,7 +155,7 @@ do_rte_announce(struct announce_hook *a, net *net, rte *new, rte *old, ea_list *
else
{
ea_list *tmpb = p->make_tmp_attrs ? p->make_tmp_attrs(old, rte_update_pool) : NULL;
if (f_run(p->out_filter, &old, &tmpb, rte_update_pool) > F_ACCEPT)
if (f_run(p->out_filter, &old, &tmpb, rte_update_pool, 0) > F_ACCEPT)
old = NULL;
}
}
@ -387,7 +387,7 @@ rte_update(rtable *table, net *net, struct proto *p, rte *new)
if (p->in_filter)
{
ea_list *old_tmpa = tmpa;
int fr = f_run(p->in_filter, &new, &tmpa, rte_update_pool);
int fr = f_run(p->in_filter, &new, &tmpa, rte_update_pool, 0);
if (fr > F_ACCEPT)
{
rte_trace_in(D_FILTERS, p, new, "filtered out");
@ -695,7 +695,7 @@ rt_show_net(struct cli *c, net *n, struct rt_show_data *d)
struct ea_list *tmpa = NULL;
ee = e;
rte_update_lock(); /* We use the update buffer for filtering */
if (d->filter == FILTER_ACCEPT || f_run(d->filter, &ee, &tmpa, rte_update_pool) <= F_ACCEPT)
if (d->filter == FILTER_ACCEPT || f_run(d->filter, &ee, &tmpa, rte_update_pool, 0) <= F_ACCEPT)
{
rt_show_rte(c, ia, e, d);
ia[0] = 0;