mirror of
https://gitlab.nic.cz/labs/bird.git
synced 2024-12-22 01:31:55 +00:00
Implemented extended route attributes and all related functions.
This commit is contained in:
Martin Mares
parent
9a38757c6a
commit
b77ae37d11
53
nest/route.h
53
nest/route.h
@ -185,12 +185,11 @@ typedef struct rta {
|
||||
byte tos; /* TOS of this route */
|
||||
byte flags; /* Route flags (RTF_...) */
|
||||
byte aflags; /* Attribute cache flags (RTAF_...) */
|
||||
byte rfu; /* Padding */
|
||||
ip_addr gw; /* Next hop */
|
||||
ip_addr from; /* Advertising router */
|
||||
struct iface *iface; /* Outgoing interface */
|
||||
struct ea_list *attrs; /* Extended Attribute chain */
|
||||
union { /* Protocol-specific data */
|
||||
} u;
|
||||
} rta;
|
||||
|
||||
#define RTS_DUMMY 0 /* Dummy route to be removed soon */
|
||||
@ -228,24 +227,32 @@ typedef struct rta {
|
||||
*/
|
||||
|
||||
typedef struct eattr {
|
||||
byte protocol; /* Protocol ID (EAP_...) */
|
||||
byte flags; /* Attribute flags (EAF_...) */
|
||||
byte id; /* Protocol-dependent ID */
|
||||
byte rfu; /* ??? */
|
||||
word id; /* EA_CODE(EAP_..., protocol-dependent ID) */
|
||||
byte flags; /* Protocol-dependent flags */
|
||||
byte type; /* Attribute type and several flags (EAF_...) */
|
||||
union {
|
||||
u32 data;
|
||||
struct adata *ptr; /* Attribute data elsewhere */
|
||||
} u;
|
||||
} eattr;
|
||||
|
||||
/* FIXME: Introduce real protocol numbers? */
|
||||
#define EAP_GENERIC 0 /* Generic attributes */
|
||||
#define EAP_BGP 1 /* BGP attributes */
|
||||
|
||||
#define EAF_OPTIONAL 0x80 /* Refer to BGP specs for full meaning */
|
||||
#define EAF_TRANSITIVE 0x40
|
||||
#define EAF_PARTIAL 0x20
|
||||
#define EAF_EXTENDED_LENGTH 0x10 /* Not used by us, internal to BGP */
|
||||
#define EAF_LONGWORD 0x01 /* Embedded value [Not a BGP flag!] */
|
||||
#define EA_CODE(proto,id) (((proto) << 8) | (id))
|
||||
#define EA_PROTO(ea) ((ea) >> 8)
|
||||
#define EA_ID(ea) ((ea) & 0xff)
|
||||
|
||||
#define EAF_TYPE_MASK 0x0f /* Mask with this to get type */
|
||||
#define EAF_TYPE_INT 0x01 /* 32-bit signed integer number */
|
||||
#define EAF_TYPE_OPAQUE 0x02 /* Opaque byte string (not filterable) */
|
||||
#define EAF_TYPE_IP_ADDRESS 0x04 /* IP address [FIXME: embed at least for IPv4?] */
|
||||
#define EAF_TYPE_AS_PATH 0x06 /* BGP AS path [FIXME: define storage layout] */
|
||||
#define EAF_TYPE_INT_SET 0x0a /* Set of integers (e.g., a community list) */
|
||||
#define EAF_EMBEDDED 0x01 /* Data stored in eattr.u.data (part of type spec) */
|
||||
#define EAF_VAR_LENGTH 0x02 /* Attribute length is variable */
|
||||
#define EAF_INLINE 0x80 /* Copy of an attribute inlined in rte (temporary ea_lists only) */
|
||||
|
||||
struct adata {
|
||||
unsigned int length;
|
||||
@ -254,28 +261,30 @@ struct adata {
|
||||
|
||||
typedef struct ea_list {
|
||||
struct ea_list *next; /* In case we have an override list */
|
||||
byte sorted; /* `Really sorted' flag (???) */
|
||||
byte flags; /* Flags: EALF_... */
|
||||
byte rfu;
|
||||
word nattrs; /* Number of attributes */
|
||||
word count; /* Number of attributes */
|
||||
eattr attrs[0]; /* Attribute definitions themselves */
|
||||
} ea_list;
|
||||
|
||||
eattr *ea_find(ea_list *, unsigned protocol, unsigned id);
|
||||
#define EALF_SORTED 1 /* Attributes are sorted by code */
|
||||
#define EALF_BISECT 2 /* Use interval bisection for searching */
|
||||
#define EALF_CACHED 4 /* Attributes belonging to cached rta */
|
||||
|
||||
#define EA_LIST_NEW(p, alloc, n) do { \
|
||||
unsigned cnt = n; \
|
||||
p = alloc(sizeof(ea_list) + cnt*sizeof(eattr)); \
|
||||
memset(p, 0, sizeof(ea_list)); \
|
||||
p->nattrs = cnt; \
|
||||
} while(0)
|
||||
eattr *ea_find(ea_list *, unsigned ea);
|
||||
void ea_dump(ea_list *);
|
||||
void ea_sort(ea_list *); /* Sort entries in all sub-lists */
|
||||
unsigned ea_scan(ea_list *); /* How many bytes do we need for merged ea_list (0=merge not needed) */
|
||||
void ea_merge(ea_list *from, ea_list *to); /* Merge sub-lists to allocated buffer */
|
||||
|
||||
void rta_init(void);
|
||||
rta *rta_lookup(rta *); /* Get rta equivalent to this one, uc++ */
|
||||
static inline rta *rta_clone(rta *r) { r->uc++; return r; }
|
||||
void _rta_free(rta *r);
|
||||
static inline void rta_free(rta *r) { if (r && !--r->uc) _rta_free(r); }
|
||||
void rta__free(rta *r);
|
||||
static inline void rta_free(rta *r) { if (r && !--r->uc) rta__free(r); }
|
||||
void rta_dump(rta *);
|
||||
void rta_dump_all(void);
|
||||
static inline eattr * rta_find(rta *a, unsigned ea) { return ea_find(a->attrs, ea); }
|
||||
|
||||
/*
|
||||
* Default protocol preferences
|
||||
|
||||
303
nest/rt-attr.c
303
nest/rt-attr.c
@ -1,12 +1,13 @@
|
||||
/*
|
||||
* BIRD -- Route Attribute Cache
|
||||
*
|
||||
* (c) 1998 Martin Mares <mj@ucw.cz>
|
||||
* (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"
|
||||
@ -22,33 +23,246 @@ 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;
|
||||
|
||||
while (x && y)
|
||||
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++)
|
||||
{
|
||||
if (x->nattrs != y->nattrs)
|
||||
return 0;
|
||||
for(c=0; c<x->nattrs; c++)
|
||||
{
|
||||
eattr *a = &x->attrs[c];
|
||||
eattr *b = &y->attrs[c];
|
||||
eattr *a = &x->attrs[c];
|
||||
eattr *b = &y->attrs[c];
|
||||
|
||||
if (a->protocol != b->protocol ||
|
||||
a->flags != b->flags ||
|
||||
a->id != b->id ||
|
||||
((a->flags & EAF_LONGWORD) ? 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;
|
||||
}
|
||||
x = x->next;
|
||||
y = y->next;
|
||||
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 (!x && !y);
|
||||
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)
|
||||
{
|
||||
@ -62,38 +276,7 @@ rta_same(rta *x, rta *y)
|
||||
ipa_equal(x->gw, y->gw) &&
|
||||
ipa_equal(x->from, y->from) &&
|
||||
x->iface == y->iface &&
|
||||
ea_same(x->attrs, y->attrs) &&
|
||||
(!x->proto->rta_same || x->proto->rta_same(x, y)));
|
||||
}
|
||||
|
||||
static inline ea_list *
|
||||
ea_list_copy(ea_list *o)
|
||||
{
|
||||
ea_list *n, **p, *z;
|
||||
unsigned i;
|
||||
|
||||
p = &n;
|
||||
while (o)
|
||||
{
|
||||
z = mb_alloc(rta_pool, sizeof(ea_list) + sizeof(eattr) * o->nattrs);
|
||||
memcpy(z, o, sizeof(ea_list) + sizeof(eattr) * o->nattrs);
|
||||
*p = z;
|
||||
p = &z->next;
|
||||
for(i=0; i<o->nattrs; i++)
|
||||
{
|
||||
eattr *a = o->attrs + i;
|
||||
if (!(a->flags & EAF_LONGWORD))
|
||||
{
|
||||
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;
|
||||
}
|
||||
}
|
||||
o = o->next;
|
||||
}
|
||||
*p = NULL;
|
||||
return n;
|
||||
ea_same(x->attrs, y->attrs));
|
||||
}
|
||||
|
||||
static rta *
|
||||
@ -112,9 +295,22 @@ 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;
|
||||
@ -123,7 +319,7 @@ rta_lookup(rta *o)
|
||||
}
|
||||
|
||||
void
|
||||
_rta_free(rta *a)
|
||||
rta__free(rta *a)
|
||||
{
|
||||
}
|
||||
|
||||
@ -152,6 +348,11 @@ rta_dump(rta *a)
|
||||
debug(" ->%I", a->gw);
|
||||
if (a->dest == RTD_DEVICE || a->dest == RTD_ROUTER)
|
||||
debug(" [%s]", a->iface ? a->iface->name : "???" );
|
||||
if (a->attrs)
|
||||
{
|
||||
debug(" EA: ");
|
||||
ea_dump(a->attrs);
|
||||
}
|
||||
}
|
||||
|
||||
void
|
||||
|
||||
Loading…
Reference in New Issue
Block a user