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/*
* filter.c - Filter handling
*
* Written 2001,2002 by Werner Almesberger
* Copyright 2001 EPFL-ICA, Network Robots
* Copyright 2002 Network Robots
*/
#include <stdint.h>
#include <stddef.h>
#include "util.h"
#include "error.h"
#include "param.h"
#include "op.h"
#include "tree.h"
#include "police.h"
#include "filter_common.h"
#include "filter.h"
/* ----------------------- Assignment of unique IDs ------------------------ */
static void assign_filter_ids(FILTER *list)
{
uint32_t prio = 1;
while (list) {
if (list->number == UNDEF_U32) list->number = prio++;
else {
if (list->number < prio)
errorf("assigned priority (%u) below minimum available "
"priority (%u)",list->number,prio);
prio = list->number+1;
}
if (list->number & ~0xffff)
errorf("invalid filter ID 0x%x",list->number);
list = list->next;
}
}
/* -------------------------------- Tunnels -------------------------------- */
CLASS class_is_tunnel;
void no_tunnel(ELEMENT *element)
{
if (element->parent.tunnel)
errorf("filter \"%s\" does not support tunnels",
element->parent.filter->dsc->name);
}
/* --------------------------------- Drop ---------------------------------- */
CLASS class_is_drop;
/* ------------------------------------------------------------------------- */
void add_element(ELEMENT *element,PARENT parent)
{
ELEMENT **anchor;
if (!parent.filter) yyerror("filter element without filter");
element->parent = parent;
for (anchor = &parent.filter->elements; *anchor; anchor = &(*anchor)->next);
*anchor = element;
}
void add_filter(FILTER *filter)
{
FILTER **anchor;
QDISC *qdisc = filter->parent.qdisc;
if (!qdisc) yyerror("filter without qdisc");
if (!(qdisc->dsc->flags & QDISC_HAS_FILTERS))
yyerrorf("qdisc \"%s\" does not have filters",qdisc->dsc->name);
for (anchor = filter->parent.class ? &filter->parent.class->filters :
&qdisc->filters; *anchor; anchor = &(*anchor)->next);
*anchor = filter;
}
/*
* Add a dummy filter element for "if" to the current qdisc, unless one
* already exists. Then append a filter element for this if expression.
* Note: there is currently no way to attach an if expression to a class @@@
* instead of a qdisc.
*/
static void unum_only(DATA d,LOCATION loc)
{
if (d.type == dt_none) return;
if (d.op && (d.op->dsc == &op_conform || d.op->dsc == &op_count)) return;
if (d.type != dt_unum && d.type != dt_ipv6 && d.type != dt_field &&
d.type != dt_field_root && d.type != dt_decision)
lerror(loc,"only integer expressions allowed in if");
if (!d.op) return;
unum_only(d.op->a,loc);
unum_only(d.op->b,loc);
unum_only(d.op->c,loc);
}
static void if_check_policers(DATA d)
{
/*
* If is wicked - it may also use policers in the expression !
* @@@ in fact, it should propagate element->police into the expression
*/
if (d.type == dt_police) check_police(d.u.police);
else if (d.type == dt_bucket) check_bucket(d.u.police);
if (!d.op) return;
if_check_policers(d.op->a);
if_check_policers(d.op->b);
if_check_policers(d.op->c);
}
static void hack_type(DATA *d)
{
if (d->type == dt_ipv4) d->type = dt_unum;
if (d->op) {
hack_type(&d->op->a);
hack_type(&d->op->b);
hack_type(&d->op->c);
}
}
ELEMENT *add_if(DATA expression,PARENT parent,FILTER *filter,LOCATION loc)
{
ELEMENT **element;
hack_type(&expression);
unum_only(expression,loc);
if_check_policers(expression);
if (!filter) {
FILTER **anchor;
#if 0
for (anchor = parent.class->parent.class ?
&parent.class->parent.class->filters :
&parent.class->parent.qdisc->filters; *anchor;
anchor= &(*anchor)->next)
#endif
for (anchor = &parent.qdisc->filters; *anchor;
anchor= &(*anchor)->next)
if ((*anchor)->dsc == &if_dsc) break;
if (*anchor) filter = *anchor;
else {
filter = alloc_t(FILTER);
filter->parent = parent;
if (parent.class == &class_is_drop) filter->parent.class = NULL;
/* okay for now, because "if" always goes to qdisc anyway @@@ */
else filter->parent.class = parent.class->parent.class;
/* current parent.class is local class; need to get outer one */
filter->number = UNDEF_U32;
filter->location = filter->parent.qdisc->location;
filter->dsc = &if_dsc;
filter->params = NULL;
filter->elements = NULL;
filter->next = NULL;
*anchor = filter;
}
}
for (element = &filter->elements; *element; element = &(*element)->next);
*element = alloc_t(ELEMENT);
(*element)->parent = parent;
(*element)->parent.filter = filter;
(*element)->number = UNDEF_U32;
(*element)->location = loc;
(*element)->params = param_make(&prm_if_expr,expression);
(*element)->police = NULL; /* @@@ sure ? */
(*element)->next = NULL;
return *element;
}
void check_filters(FILTER *list)
{
assign_filter_ids(list);
while (list) {
list->dsc->check(list);
list = list->next;
}
}
void dump_filters(FILTER *list)
{
while (list) {
list->dsc->dump_tc(list);
list = list->next;
}
}
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