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bird/nest/rt-attr.c

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/*
* BIRD -- Route Attribute Cache
*
* (c) 1998--1999 Martin Mares <mj@ucw.cz>
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
#include <string.h>
#include <alloca.h>
#include "nest/bird.h"
#include "nest/route.h"
#include "nest/protocol.h"
#include "nest/iface.h"
#include "lib/resource.h"
/*
* FIXME: Implement hash tables and garbage collection!
*/
static rta *first_rta;
static slab *rta_slab;
static pool *rta_pool;
/*
* Extended Attributes
*/
eattr *
ea_find(ea_list *e, unsigned id)
{
eattr *a;
int l, r, m;
while (e)
{
if (e->flags & EALF_BISECT)
{
l = 0;
r = e->count + 1;
while (l <= r)
{
m = (l+r) / 2;
a = &e->attrs[m];
if (a->id == id)
return a;
else if (a->id < id)
l = m+1;
else
r = m-1;
}
}
else
for(m=0; m<e->count; m++)
if (e->attrs[m].id == id)
return &e->attrs[m];
e = e->next;
}
return NULL;
}
static inline void
ea_do_sort(ea_list *e)
{
unsigned n = e->count;
eattr *a = e->attrs;
eattr *b = alloca(n * sizeof(eattr));
unsigned s, ss;
/* We need to use a stable sorting algorithm, hence mergesort */
do
{
s = ss = 0;
while (s < n)
{
eattr *p, *q, *lo, *hi;
p = b;
ss = s;
*p++ = a[s++];
while (s < n && p[-1].id <= a[s].id)
*p++ = a[s++];
if (s < n)
{
q = p;
*p++ = a[s++];
while (s < n && p[-1].id <= a[s].id)
*p++ = a[s++];
lo = b;
hi = q;
s = ss;
while (lo < q && hi < p)
if (lo->id <= hi->id)
a[s++] = *lo++;
else
a[s++] = *hi++;
while (lo < q)
a[s++] = *lo++;
while (hi < p)
a[s++] = *hi++;
}
}
}
while (ss);
}
static inline void
ea_do_prune(ea_list *e)
{
eattr *s, *d;
int i;
/* Discard duplicates. Do you remember sorting was stable? */
s = d = e->attrs + 1;
for(i=1; i<e->count; i++)
if (s->id != d[-1].id)
*d++ = *s++;
else
s++;
e->count = d - e->attrs;
}
void
ea_sort(ea_list *e)
{
while (e)
{
if (!(e->flags & EALF_SORTED))
{
ea_do_sort(e);
ea_do_prune(e);
e->flags |= EALF_SORTED;
}
#if 0 /* FIXME: Remove this after some testing */
if (e->count > 5)
#endif
e->flags |= EALF_BISECT;
e = e->next;
}
}
unsigned
ea_scan(ea_list *e)
{
unsigned cnt = 0;
while (e)
{
cnt += e->count;
e = e->next;
}
return sizeof(ea_list) + sizeof(eattr)*cnt;
}
void
ea_merge(ea_list *e, ea_list *t)
{
eattr *d = t->attrs;
t->flags = 0;
t->count = 0;
t->next = NULL;
while (e)
{
memcpy(d, e->attrs, sizeof(eattr)*e->count);
t->count += e->count;
d += e->count;
e = e->next;
}
}
static inline int
ea_same(ea_list *x, ea_list *y)
{
int c;
if (!x || !y)
return x == y;
ASSERT(!x->next && !y->next);
if (x->count != y->count)
return 0;
for(c=0; c<x->count; c++)
{
eattr *a = &x->attrs[c];
eattr *b = &y->attrs[c];
if (a->id != b->id ||
a->flags != b->flags ||
a->type != b->type ||
((a->type & EAF_EMBEDDED) ? a->u.data != b->u.data :
(a->u.ptr->length != b->u.ptr->length || memcmp(a->u.ptr, b->u.ptr, a->u.ptr->length))))
return 0;
}
return 1;
}
static inline ea_list *
ea_list_copy(ea_list *o)
{
ea_list *n;
unsigned i, len;
if (!o)
return NULL;
ASSERT(!o->next);
len = sizeof(ea_list) + sizeof(eattr) * o->count;
n = mb_alloc(rta_pool, len);
memcpy(n, o, len);
n->flags |= EALF_CACHED;
for(i=0; i<o->count; i++)
{
eattr *a = &n->attrs[i];
if (!(a->flags & EAF_EMBEDDED))
{
unsigned size = sizeof(struct adata) + a->u.ptr->length;
struct adata *d = mb_alloc(rta_pool, size);
memcpy(d, a->u.ptr, size);
a->u.ptr = d;
}
}
return n;
}
void
ea_dump(ea_list *e)
{
int i;
if (!e)
{
debug("NONE");
return;
}
while (e)
{
debug("[%c%c%c]",
(e->flags & EALF_SORTED) ? 'S' : 's',
(e->flags & EALF_BISECT) ? 'B' : 'b',
(e->flags & EALF_CACHED) ? 'C' : 'c');
for(i=0; i<e->count; i++)
{
eattr *a = &e->attrs[i];
debug(" %02x:%02x.%02x", EA_PROTO(a->id), EA_ID(a->id), a->flags);
if (a->type & EAF_INLINE)
debug("*");
debug("=%c", "?iO?I?P???S?????" [a->type & EAF_TYPE_MASK]);
if (a->type & EAF_EMBEDDED)
debug(":%08x", a->u.data);
else
{
int j, len = a->u.ptr->length;
debug("[%d]:", len);
for(j=0; j<len; j++)
debug("%02x", a->u.ptr->data[j]);
}
}
if (e = e->next)
debug(" | ");
}
}
/*
* rta's
*/
static inline int
rta_same(rta *x, rta *y)
{
return (x->proto == y->proto &&
x->source == y->source &&
x->scope == y->scope &&
x->cast == y->cast &&
x->dest == y->dest &&
x->flags == y->flags &&
ipa_equal(x->gw, y->gw) &&
ipa_equal(x->from, y->from) &&
x->iface == y->iface &&
ea_same(x->attrs, y->attrs));
}
static rta *
rta_copy(rta *o)
{
rta *r = sl_alloc(rta_slab);
memcpy(r, o, sizeof(rta));
r->uc = 1;
r->attrs = ea_list_copy(o->attrs);
return r;
}
rta *
rta_lookup(rta *o)
{
rta *r;
ASSERT(!(o->aflags & RTAF_CACHED));
if (o->attrs)
{
if (o->attrs->next) /* Multiple ea_list's, need to merge them */
{
ea_list *ml = alloca(ea_scan(o->attrs));
ea_merge(o->attrs, ml);
o->attrs = ml;
}
ea_sort(o->attrs);
}
for(r=first_rta; r; r=r->next)
if (rta_same(r, o))
return rta_clone(r);
r = rta_copy(o);
r->aflags = RTAF_CACHED;
r->next = first_rta;
first_rta = r;
return r;
}
void
rta__free(rta *a)
{
}
void
rta_dump(rta *a)
{
static char *rts[] = { "RTS_DUMMY", "RTS_STATIC", "RTS_INHERIT", "RTS_DEVICE",
"RTS_STAT_DEV", "RTS_REDIR", "RTS_RIP", "RTS_RIP_EXT",
"RTS_OSPF", "RTS_OSPF_EXT", "RTS_OSPF_IA",
"RTS_OSPF_BOUNDARY", "RTS_BGP" };
static char *sco[] = { "HOST", "LINK", "SITE", "UNIV" };
static char *rtc[] = { "", " BC", " MC", " AC" };
static char *rtd[] = { "", " DEV", " HOLE", " UNREACH", " PROHIBIT" };
debug("p=%s uc=%d %s %s%s%s",
a->proto->name, a->uc, rts[a->source], sco[a->scope], rtc[a->cast],
rtd[a->dest]);
if (a->flags & RTF_EXTERIOR)
debug(" EXT");
if (a->flags & RTF_TAGGED)
debug(" TAG");
if (!(a->aflags & RTAF_CACHED))
debug(" !CACHED");
debug(" <-%I", a->from);
if (a->dest == RTD_ROUTER)
debug(" ->%I", a->gw);
if (a->dest == RTD_DEVICE || a->dest == RTD_ROUTER)
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debug(" [%s]", a->iface ? a->iface->name : "???" );
if (a->attrs)
{
debug(" EA: ");
ea_dump(a->attrs);
}
}
void
rta_dump_all(void)
{
rta *a;
debug("Route attribute cache:\n");
for(a=first_rta; a; a=a->next)
{
debug("%p ", a);
rta_dump(a);
debug("\n");
}
debug("\n");
}
void
rta_init(void)
{
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rta_pool = rp_new(&root_pool, "Attributes");
rta_slab = sl_new(rta_pool, sizeof(rta));
}