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BGP Extended communities.

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This commit is contained in:
Ondrej Zajicek
2011-08-12 21:03:43 +02:00
parent bde872bba7
commit 42a0c05408
14 changed files with 793 additions and 110 deletions
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76
proto/bgp/attrs.c
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@@ -247,7 +247,6 @@ bgp_check_community(struct bgp_proto *p UNUSED, byte *a UNUSED, int len)
return ((len % 4) == 0) ? 0 : WITHDRAW;
}
static int
bgp_check_cluster_list(struct bgp_proto *p UNUSED, byte *a UNUSED, int len)
{
@@ -281,6 +280,13 @@ bgp_check_unreach_nlri(struct bgp_proto *p UNUSED, byte *a UNUSED, int len UNUSE
return IGNORE;
}
static int
bgp_check_ext_community(struct bgp_proto *p UNUSED, byte *a UNUSED, int len)
{
return ((len % 8) == 0) ? 0 : WITHDRAW;
}
static struct attr_desc bgp_attr_table[] = {
{ NULL, -1, 0, 0, 0, /* Undefined */
NULL, NULL },
@@ -311,7 +317,8 @@ static struct attr_desc bgp_attr_table[] = {
bgp_check_reach_nlri, NULL },
{ "mp_unreach_nlri", -1, BAF_OPTIONAL, EAF_TYPE_OPAQUE, 1, /* BA_MP_UNREACH_NLRI */
bgp_check_unreach_nlri, NULL },
{ .name = NULL }, /* BA_EXTENDED_COMM */
{ "ext_community", -1, BAF_OPTIONAL | BAF_TRANSITIVE, EAF_TYPE_EC_SET, 1, /* BA_EXT_COMMUNITY */
bgp_check_ext_community, NULL },
{ "as4_path", -1, BAF_OPTIONAL | BAF_TRANSITIVE, EAF_TYPE_OPAQUE, 1, /* BA_AS4_PATH */
NULL, NULL },
{ "as4_aggregator", -1, BAF_OPTIONAL | BAF_TRANSITIVE, EAF_TYPE_OPAQUE, 1, /* BA_AS4_PATH */
@@ -468,7 +475,7 @@ bgp_get_attr_len(eattr *a)
unsigned int
bgp_encode_attrs(struct bgp_proto *p, byte *w, ea_list *attrs, int remains)
{
unsigned int i, code, flags;
unsigned int i, code, type, flags;
byte *start = w;
int len, rv;
@@ -477,6 +484,7 @@ bgp_encode_attrs(struct bgp_proto *p, byte *w, ea_list *attrs, int remains)
eattr *a = &attrs->attrs[i];
ASSERT(EA_PROTO(a->id) == EAP_BGP);
code = EA_ID(a->id);
#ifdef IPV6
/* When talking multiprotocol BGP, the NEXT_HOP attributes are used only temporarily. */
if (code == BA_NEXT_HOP)
@@ -559,11 +567,12 @@ bgp_encode_attrs(struct bgp_proto *p, byte *w, ea_list *attrs, int remains)
/* Standard path continues here ... */
type = a->type & EAF_TYPE_MASK;
flags = a->flags & (BAF_OPTIONAL | BAF_TRANSITIVE | BAF_PARTIAL);
len = bgp_get_attr_len(a);
/* Skip empty int sets */
if (((a->type & EAF_TYPE_MASK) == EAF_TYPE_INT_SET) && (len == 0))
/* Skip empty sets */
if (((type == EAF_TYPE_INT_SET) || (type == EAF_TYPE_EC_SET)) && (len == 0))
continue;
if (remains < len + 4)
@@ -572,7 +581,7 @@ bgp_encode_attrs(struct bgp_proto *p, byte *w, ea_list *attrs, int remains)
rv = bgp_encode_attr_hdr(w, flags, code, len);
ADVANCE(w, remains, rv);
switch (a->type & EAF_TYPE_MASK)
switch (type)
{
case EAF_TYPE_INT:
case EAF_TYPE_ROUTER_ID:
@@ -589,8 +598,9 @@ bgp_encode_attrs(struct bgp_proto *p, byte *w, ea_list *attrs, int remains)
break;
}
case EAF_TYPE_INT_SET:
case EAF_TYPE_EC_SET:
{
u32 *z = (u32 *)a->u.ptr->data;
u32 *z = int_set_get_data(a->u.ptr);
int i;
for(i=0; i<len; i+=4)
put_u32(w+i, *z++);
@@ -624,13 +634,50 @@ bgp_compare_u32(const u32 *x, const u32 *y)
return (*x < *y) ? -1 : (*x > *y) ? 1 : 0;
}
static void
bgp_normalize_set(u32 *dest, u32 *src, unsigned cnt)
static inline void
bgp_normalize_int_set(u32 *dest, u32 *src, unsigned cnt)
{
memcpy(dest, src, sizeof(u32) * cnt);
qsort(dest, cnt, sizeof(u32), (int(*)(const void *, const void *)) bgp_compare_u32);
}
static int
bgp_compare_ec(const u32 *xp, const u32 *yp)
{
u64 x = ec_get(xp, 0);
u64 y = ec_get(yp, 0);
return (x < y) ? -1 : (x > y) ? 1 : 0;
}
static inline void
bgp_normalize_ec_set(struct adata *ad, u32 *src, int internal)
{
u32 *dst = int_set_get_data(ad);
/* Remove non-transitive communities (EC_TBIT active) on external sessions */
if (! internal)
{
int len = int_set_get_size(ad);
u32 *t = dst;
int i;
for (i=0; i < len; i += 2)
{
if (src[i] & EC_TBIT)
continue;
*t++ = src[i];
*t++ = src[i+1];
}
ad->length = (t - dst) * 4;
}
else
memcpy(dst, src, ad->length);
qsort(dst, ad->length / 8, 8, (int(*)(const void *, const void *)) bgp_compare_ec);
}
static void
bgp_rehash_buckets(struct bgp_proto *p)
{
@@ -763,7 +810,15 @@ bgp_get_bucket(struct bgp_proto *p, net *n, ea_list *attrs, int originate)
{
struct adata *z = alloca(sizeof(struct adata) + d->u.ptr->length);
z->length = d->u.ptr->length;
bgp_normalize_set((u32 *) z->data, (u32 *) d->u.ptr->data, z->length / 4);
bgp_normalize_int_set((u32 *) z->data, (u32 *) d->u.ptr->data, z->length / 4);
d->u.ptr = z;
break;
}
case EAF_TYPE_EC_SET:
{
struct adata *z = alloca(sizeof(struct adata) + d->u.ptr->length);
z->length = d->u.ptr->length;
bgp_normalize_ec_set(z, (u32 *) d->u.ptr->data, p->is_internal);
d->u.ptr = z;
break;
}
@@ -1447,6 +1502,7 @@ bgp_decode_attrs(struct bgp_conn *conn, byte *attr, unsigned int len, struct lin
ipa_ntoh(*(ip_addr *)ad->data);
break;
case EAF_TYPE_INT_SET:
case EAF_TYPE_EC_SET:
{
u32 *z = (u32 *) ad->data;
for(i=0; i<ad->length/4; i++)