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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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177
nest/a-set.c
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@ -36,10 +36,11 @@ int_set_format(struct adata *set, int way, int from, byte *buf, unsigned int siz
{
u32 *z = (u32 *) set->data;
byte *end = buf + size - 24;
int from2 = MAX(from, 0);
int to = set->length / 4;
int i;
for (i = MAX(from, 0); i < to; i++)
for (i = from2; i < to; i++)
{
if (buf > end)
{
@ -50,7 +51,7 @@ int_set_format(struct adata *set, int way, int from, byte *buf, unsigned int siz
return i;
}
if (i > from)
if (i > from2)
*buf++ = ' ';
if (way)
@ -62,6 +63,84 @@ int_set_format(struct adata *set, int way, int from, byte *buf, unsigned int siz
return 0;
}
int
ec_format(byte *buf, u64 ec)
{
u32 type, key, val;
char tbuf[16], *kind;
type = ec >> 48;
switch (type & 0xf0ff)
{
case EC_RT: kind = "rt"; break;
case EC_RO: kind = "ro"; break;
default:
kind = tbuf;
bsprintf(kind, "unknown 0x%x", type);
}
switch (ec >> 56)
{
/* RFC 4360 3.1. Two-Octet AS Specific Extended Community */
case 0x00:
case 0x40:
key = (ec >> 32) & 0xFFFF;
val = ec;
return bsprintf(buf, "(%s, %u, %u)", kind, key, val);
/* RFC 4360 3.2. IPv4 Address Specific Extended Community */
case 0x01:
case 0x41:
key = ec >> 16;
val = ec & 0xFFFF;
return bsprintf(buf, "(%s, %R, %u)", kind, key, val);
/* RFC 5668 4-Octet AS Specific BGP Extended Community */
case 0x02:
case 0x42:
key = ec >> 16;
val = ec & 0xFFFF;
return bsprintf(buf, "(%s, %u, %u)", kind, key, val);
/* Generic format for unknown kinds of extended communities */
default:
key = ec >> 32;
val = ec;
return bsprintf(buf, "(generic, 0x%x, 0x%x)", key, val);
}
}
int
ec_set_format(struct adata *set, int from, byte *buf, unsigned int size)
{
u32 *z = int_set_get_data(set);
byte *end = buf + size - 24;
int from2 = MAX(from, 0);
int to = int_set_get_size(set);
int i;
for (i = from2; i < to; i += 2)
{
if (buf > end)
{
if (from < 0)
strcpy(buf, " ...");
else
*buf = 0;
return i;
}
if (i > from2)
*buf++ = ' ';
buf += ec_format(buf, ec_get(z, i));
}
*buf = 0;
return 0;
}
int
int_set_contains(struct adata *list, u32 val)
{
@ -69,10 +148,32 @@ int_set_contains(struct adata *list, u32 val)
return 0;
u32 *l = (u32 *) list->data;
unsigned int i;
for (i=0; i<list->length/4; i++)
int len = int_set_get_size(list);
int i;
for (i = 0; i < len; i++)
if (*l++ == val)
return 1;
return 0;
}
int
ec_set_contains(struct adata *list, u64 val)
{
if (!list)
return 0;
u32 *l = int_set_get_data(list);
int len = int_set_get_size(list);
u32 eh = ec_hi(val);
u32 el = ec_lo(val);
int i;
for (i=0; i < len; i += 2)
if (l[i] == eh && l[i+1] == el)
return 1;
return 0;
}
@ -86,7 +187,7 @@ int_set_add(struct linpool *pool, struct adata *list, u32 val)
return list;
len = list ? list->length : 0;
res = lp_alloc(pool, len + sizeof(struct adata) + 4);
res = lp_alloc(pool, sizeof(struct adata) + len + 4);
res->length = len + 4;
* (u32 *) res->data = val;
if (list)
@ -94,24 +195,72 @@ int_set_add(struct linpool *pool, struct adata *list, u32 val)
return res;
}
struct adata *
ec_set_add(struct linpool *pool, struct adata *list, u64 val)
{
if (ec_set_contains(list, val))
return list;
int olen = list ? list->length : 0;
struct adata *res = lp_alloc(pool, sizeof(struct adata) + olen + 8);
res->length = olen + 8;
if (list)
memcpy(res->data, list->data, list->length);
u32 *l = (u32 *) (res->data + res->length - 8);
l[0] = ec_hi(val);
l[1] = ec_lo(val);
return res;
}
struct adata *
int_set_del(struct linpool *pool, struct adata *list, u32 val)
{
struct adata *res;
u32 *l, *k;
unsigned int i;
if (!int_set_contains(list, val))
return list;
res = lp_alloc(pool, list->length + sizeof(struct adata) - 4);
res->length = list->length-4;
struct adata *res;
res = lp_alloc(pool, sizeof(struct adata) + list->length - 4);
res->length = list->length - 4;
l = (u32 *) list->data;
k = (u32 *) res->data;
for (i=0; i<list->length/4; i++)
u32 *l = int_set_get_data(list);
u32 *k = int_set_get_data(res);
int len = int_set_get_size(list);
int i;
for (i = 0; i < len; i++)
if (l[i] != val)
*k++ = l[i];
return res;
}
struct adata *
ec_set_del(struct linpool *pool, struct adata *list, u64 val)
{
if (!ec_set_contains(list, val))
return list;
struct adata *res;
res = lp_alloc(pool, sizeof(struct adata) + list->length - 8);
res->length = list->length - 8;
u32 *l = int_set_get_data(list);
u32 *k = int_set_get_data(res);
int len = int_set_get_size(list);
u32 eh = ec_hi(val);
u32 el = ec_lo(val);
int i;
for (i=0; i < len; i += 2)
if (! (l[i] == eh && l[i+1] == el))
{
*k++ = l[i];
*k++ = l[i+1];
}
return res;
}