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authorMartin Mares <mj@ucw.cz>2000-05-02 14:51:39 +0200
committerMartin Mares <mj@ucw.cz>2000-05-02 14:51:39 +0200
commitd1a74339d4edb717fbe98d412bd5e4ad03bb20a2 (patch)
tree027c9e76e7792967a00d845f90d70f9acb8ce50f
parent85195f1a53eb350cd32ecba69c208dbece6fb776 (diff)
downloadbird-d1a74339d4edb717fbe98d412bd5e4ad03bb20a2.tar
bird-d1a74339d4edb717fbe98d412bd5e4ad03bb20a2.zip
Handle redistribution of unknown attributes correctly.
-rw-r--r--proto/bgp/attrs.c22
1 files changed, 15 insertions, 7 deletions
diff --git a/proto/bgp/attrs.c b/proto/bgp/attrs.c
index 4136049..ee06298 100644
--- a/proto/bgp/attrs.c
+++ b/proto/bgp/attrs.c
@@ -104,6 +104,8 @@ static struct attr_desc bgp_attr_table[] = {
#endif
};
+#define ATTR_KNOWN(code) ((code) < ARRAY_SIZE(bgp_attr_table) && bgp_attr_table[code].name)
+
byte *
bgp_encode_attrs(byte *w, struct bgp_bucket *buck)
{
@@ -119,7 +121,7 @@ bgp_encode_attrs(byte *w, struct bgp_bucket *buck)
ASSERT(EA_PROTO(a->id) == EAP_BGP);
code = EA_ID(a->id);
flags = a->flags & (BAF_OPTIONAL | BAF_TRANSITIVE | BAF_PARTIAL);
- if (code && code < ARRAY_SIZE(bgp_attr_table))
+ if (ATTR_KNOWN(code))
{
struct attr_desc *desc = &bgp_attr_table[code];
len = desc->expected_length;
@@ -376,15 +378,21 @@ bgp_get_bucket(struct bgp_proto *p, ea_list *old, ea_list *tmp, int originate)
if (EA_PROTO(a->id) != EAP_BGP)
continue;
code = EA_ID(a->id);
- if (code < ARRAY_SIZE(bgp_attr_table))
+ if (ATTR_KNOWN(code))
{
if (!bgp_attr_table[code].allow_in_ebgp && !p->is_internal)
continue;
/* The flags might have been zero if the attr was added by filters */
a->flags = (a->flags & BAF_PARTIAL) | bgp_attr_table[code].expected_flags;
+ if (code < 32)
+ seen |= 1 << code;
+ }
+ else
+ {
+ /* Don't re-export unknown non-transitive attributes */
+ if (!(a->flags & BAF_TRANSITIVE))
+ continue;
}
- if (code < 32)
- seen |= 1 << code;
*d = *a;
if ((d->type & EAF_ORIGINATED) && !originate && (d->flags & BAF_TRANSITIVE) && (d->flags & BAF_OPTIONAL))
d->flags |= BAF_PARTIAL;
@@ -747,7 +755,7 @@ bgp_decode_attrs(struct bgp_conn *conn, byte *attr, unsigned int len, struct lin
DBG("Attr %02x %02x %d\n", code, flags, l);
if (seen[code/8] & (1 << (code%8)))
goto malformed;
- if (code && code < ARRAY_SIZE(bgp_attr_table))
+ if (ATTR_KNOWN(code))
{
struct attr_desc *desc = &bgp_attr_table[code];
if (desc->expected_length >= 0 && desc->expected_length != (int) l)
@@ -877,7 +885,7 @@ bgp_get_attr(eattr *a, byte *buf)
unsigned int i = EA_ID(a->id);
struct attr_desc *d;
- if (i && i < ARRAY_SIZE(bgp_attr_table))
+ if (ATTR_KNOWN(i))
{
d = &bgp_attr_table[i];
buf += bsprintf(buf, "%s", d->name);
@@ -890,7 +898,7 @@ bgp_get_attr(eattr *a, byte *buf)
}
return GA_NAME;
}
- bsprintf(buf, "%02x%s", i, (a->flags & BAF_TRANSITIVE) ? "[t]" : "");
+ bsprintf(buf, "%02x%s", i, (a->flags & BAF_TRANSITIVE) ? " [t]" : "");
return GA_NAME;
}