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Allow EA type to be set to 'undefined' which overrides all further definitons

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of that EA in the same list and causes ea_find() to fail unless you add
EA_ALLOW_UNDEF to the second argument.

ea_sort (resp. ea_do_prune()) removes all undef'd attributes from the list.

I hope this works :)
This commit is contained in:
Martin Mares 1999-11-18 14:41:29 +00:00
parent f31156ca21
commit 8d24b6899d
2 changed files with 33 additions and 11 deletions
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4
nest/route.h
View file

@ -265,12 +265,16 @@ typedef struct eattr {
#define EA_PROTO(ea) ((ea) >> 8)
#define EA_ID(ea) ((ea) & 0xff)
#define EA_CODE_MASK 0xffff
#define EA_ALLOW_UNDEF 0x10000 /* ea_find: allow EAF_TYPE_UNDEF */
#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_TYPE_UNDEF 0x0f /* `force undefined' entry */
#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) */

40
nest/rt-attr.c
View file

@ -27,8 +27,8 @@ static pool *rta_pool;
* Extended Attributes
*/
eattr *
ea_find(ea_list *e, unsigned id)
static inline eattr *
ea__find(ea_list *e, unsigned id)
{
eattr *a;
int l, r, m;
@ -60,6 +60,17 @@ ea_find(ea_list *e, unsigned id)
return NULL;
}
eattr *
ea_find(ea_list *e, unsigned id)
{
eattr *a = ea__find(e, id & EA_CODE_MASK);
if (a && (a->type & EAF_TYPE_MASK) == EAF_TYPE_UNDEF &&
!(id & EA_ALLOW_UNDEF))
return NULL;
return a;
}
static inline void
ea_do_sort(ea_list *e)
{
@ -107,17 +118,24 @@ ea_do_sort(ea_list *e)
static inline void
ea_do_prune(ea_list *e)
{
eattr *s, *d;
int i;
eattr *s, *d, *l;
int i = 0;
/* 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
/* Discard duplicates and undefs. Do you remember sorting was stable? */
s = d = e->attrs;
l = e->attrs + e->count;
while (s < l)
{
if ((s->type & EAF_TYPE_MASK) != EAF_TYPE_UNDEF)
{
*d++ = *s;
i++;
}
s++;
e->count = d - e->attrs;
while (s < l && s->id == s[-1].id)
s++;
}
e->count = i;
}
void