mirror of
https://gitlab.nic.cz/labs/bird.git
synced 2024-12-22 17:51:53 +00:00
3c09af4169
The add() function used to prepend a new community to clist, but after this fix the add() function appends new community.
458 lines
9.1 KiB
C
458 lines
9.1 KiB
C
/*
|
|
* BIRD -- Set/Community-list Operations
|
|
*
|
|
* (c) 2000 Martin Mares <mj@ucw.cz>
|
|
* (c) 2000 Pavel Machek <pavel@ucw.cz>
|
|
*
|
|
* Can be freely distributed and used under the terms of the GNU GPL.
|
|
*/
|
|
|
|
#include "nest/bird.h"
|
|
#include "nest/route.h"
|
|
#include "nest/attrs.h"
|
|
#include "lib/resource.h"
|
|
#include "lib/string.h"
|
|
|
|
/**
|
|
* int_set_format - format an &set for printing
|
|
* @set: set attribute to be formatted
|
|
* @way: style of format (0 for router ID list, 1 for community list)
|
|
* @from: starting position in set
|
|
* @buf: destination buffer
|
|
* @size: size of buffer
|
|
*
|
|
* This function takes a set attribute and formats it. @way specifies
|
|
* the style of format (router ID / community). @from argument can be
|
|
* used to specify the first printed value for the purpose of printing
|
|
* untruncated sets even with smaller buffers. If the output fits in
|
|
* the buffer, 0 is returned, otherwise the position of the first not
|
|
* printed item is returned. This value can be used as @from argument
|
|
* in subsequent calls. If truncated output suffices, -1 can be
|
|
* instead used as @from, in that case " ..." is eventually added at
|
|
* the buffer to indicate truncation.
|
|
*/
|
|
int
|
|
int_set_format(struct adata *set, int way, int from, byte *buf, uint size)
|
|
{
|
|
u32 *z = (u32 *) set->data;
|
|
byte *end = buf + size - 24;
|
|
int from2 = MAX(from, 0);
|
|
int to = set->length / 4;
|
|
int i;
|
|
|
|
for (i = from2; i < to; i++)
|
|
{
|
|
if (buf > end)
|
|
{
|
|
if (from < 0)
|
|
strcpy(buf, " ...");
|
|
else
|
|
*buf = 0;
|
|
return i;
|
|
}
|
|
|
|
if (i > from2)
|
|
*buf++ = ' ';
|
|
|
|
if (way)
|
|
buf += bsprintf(buf, "(%d,%d)", z[i] >> 16, z[i] & 0xffff);
|
|
else
|
|
buf += bsprintf(buf, "%R", z[i]);
|
|
}
|
|
*buf = 0;
|
|
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, uint size)
|
|
{
|
|
u32 *z = int_set_get_data(set);
|
|
byte *end = buf + size - 64;
|
|
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
|
|
lc_format(byte *buf, lcomm lc)
|
|
{
|
|
return bsprintf(buf, "(%u, %u, %u)", lc.asn, lc.ldp1, lc.ldp2);
|
|
}
|
|
|
|
int
|
|
lc_set_format(struct adata *set, int from, byte *buf, uint bufsize)
|
|
{
|
|
u32 *d = (u32 *) set->data;
|
|
byte *end = buf + bufsize - 64;
|
|
int from2 = MAX(from, 0);
|
|
int to = set->length / 4;
|
|
int i;
|
|
|
|
for (i = from2; i < to; i += 3)
|
|
{
|
|
if (buf > end)
|
|
{
|
|
if (from < 0)
|
|
strcpy(buf, "...");
|
|
else
|
|
buf[-1] = 0;
|
|
return i;
|
|
}
|
|
|
|
buf += bsprintf(buf, "(%u, %u, %u)", d[i], d[i+1], d[i+2]);
|
|
*buf++ = ' ';
|
|
}
|
|
|
|
if (i != from2)
|
|
buf--;
|
|
|
|
*buf = 0;
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
int_set_contains(struct adata *list, u32 val)
|
|
{
|
|
if (!list)
|
|
return 0;
|
|
|
|
u32 *l = (u32 *) list->data;
|
|
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;
|
|
}
|
|
|
|
int
|
|
lc_set_contains(struct adata *list, lcomm val)
|
|
{
|
|
if (!list)
|
|
return 0;
|
|
|
|
u32 *l = int_set_get_data(list);
|
|
int len = int_set_get_size(list);
|
|
int i;
|
|
|
|
for (i = 0; i < len; i += 3)
|
|
if (lc_match(l, i, val))
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
struct adata *
|
|
int_set_add(struct linpool *pool, struct adata *list, u32 val)
|
|
{
|
|
struct adata *res;
|
|
int len;
|
|
|
|
if (int_set_contains(list, val))
|
|
return list;
|
|
|
|
len = list ? list->length : 0;
|
|
res = lp_alloc(pool, sizeof(struct adata) + len + 4);
|
|
res->length = len + 4;
|
|
|
|
if (list)
|
|
memcpy(res->data, list->data, list->length);
|
|
|
|
u32 *c = (u32 *) (res->data + len);
|
|
*c = 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 + olen);
|
|
l[0] = ec_hi(val);
|
|
l[1] = ec_lo(val);
|
|
|
|
return res;
|
|
}
|
|
|
|
struct adata *
|
|
lc_set_add(struct linpool *pool, struct adata *list, lcomm val)
|
|
{
|
|
if (lc_set_contains(list, val))
|
|
return list;
|
|
|
|
int olen = list ? list->length : 0;
|
|
struct adata *res = lp_alloc(pool, sizeof(struct adata) + olen + LCOMM_LENGTH);
|
|
res->length = olen + LCOMM_LENGTH;
|
|
|
|
if (list)
|
|
memcpy(res->data, list->data, list->length);
|
|
|
|
lc_put((u32 *) (res->data + olen), val);
|
|
|
|
return res;
|
|
}
|
|
|
|
struct adata *
|
|
int_set_del(struct linpool *pool, struct adata *list, u32 val)
|
|
{
|
|
if (!int_set_contains(list, val))
|
|
return list;
|
|
|
|
struct adata *res;
|
|
res = lp_alloc(pool, sizeof(struct adata) + list->length - 4);
|
|
res->length = list->length - 4;
|
|
|
|
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;
|
|
}
|
|
|
|
struct adata *
|
|
lc_set_del(struct linpool *pool, struct adata *list, lcomm val)
|
|
{
|
|
if (!lc_set_contains(list, val))
|
|
return list;
|
|
|
|
struct adata *res;
|
|
res = lp_alloc(pool, sizeof(struct adata) + list->length - LCOMM_LENGTH);
|
|
res->length = list->length - LCOMM_LENGTH;
|
|
|
|
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 += 3)
|
|
if (! lc_match(l, i, val))
|
|
k = lc_copy(k, l+i);
|
|
|
|
return res;
|
|
}
|
|
|
|
struct adata *
|
|
int_set_union(struct linpool *pool, struct adata *l1, struct adata *l2)
|
|
{
|
|
if (!l1)
|
|
return l2;
|
|
if (!l2)
|
|
return l1;
|
|
|
|
struct adata *res;
|
|
int len = int_set_get_size(l2);
|
|
u32 *l = int_set_get_data(l2);
|
|
u32 tmp[len];
|
|
u32 *k = tmp;
|
|
int i;
|
|
|
|
for (i = 0; i < len; i++)
|
|
if (!int_set_contains(l1, l[i]))
|
|
*k++ = l[i];
|
|
|
|
if (k == tmp)
|
|
return l1;
|
|
|
|
len = (k - tmp) * 4;
|
|
res = lp_alloc(pool, sizeof(struct adata) + l1->length + len);
|
|
res->length = l1->length + len;
|
|
memcpy(res->data, l1->data, l1->length);
|
|
memcpy(res->data + l1->length, tmp, len);
|
|
return res;
|
|
}
|
|
|
|
struct adata *
|
|
ec_set_union(struct linpool *pool, struct adata *l1, struct adata *l2)
|
|
{
|
|
if (!l1)
|
|
return l2;
|
|
if (!l2)
|
|
return l1;
|
|
|
|
struct adata *res;
|
|
int len = int_set_get_size(l2);
|
|
u32 *l = int_set_get_data(l2);
|
|
u32 tmp[len];
|
|
u32 *k = tmp;
|
|
int i;
|
|
|
|
for (i = 0; i < len; i += 2)
|
|
if (!ec_set_contains(l1, ec_get(l, i)))
|
|
{
|
|
*k++ = l[i];
|
|
*k++ = l[i+1];
|
|
}
|
|
|
|
if (k == tmp)
|
|
return l1;
|
|
|
|
len = (k - tmp) * 4;
|
|
res = lp_alloc(pool, sizeof(struct adata) + l1->length + len);
|
|
res->length = l1->length + len;
|
|
memcpy(res->data, l1->data, l1->length);
|
|
memcpy(res->data + l1->length, tmp, len);
|
|
return res;
|
|
}
|
|
|
|
struct adata *
|
|
lc_set_union(struct linpool *pool, struct adata *l1, struct adata *l2)
|
|
{
|
|
if (!l1)
|
|
return l2;
|
|
if (!l2)
|
|
return l1;
|
|
|
|
struct adata *res;
|
|
int len = int_set_get_size(l2);
|
|
u32 *l = int_set_get_data(l2);
|
|
u32 tmp[len];
|
|
u32 *k = tmp;
|
|
int i;
|
|
|
|
for (i = 0; i < len; i += 3)
|
|
if (!lc_set_contains(l1, lc_get(l, i)))
|
|
k = lc_copy(k, l+i);
|
|
|
|
if (k == tmp)
|
|
return l1;
|
|
|
|
len = (k - tmp) * 4;
|
|
res = lp_alloc(pool, sizeof(struct adata) + l1->length + len);
|
|
res->length = l1->length + len;
|
|
memcpy(res->data, l1->data, l1->length);
|
|
memcpy(res->data + l1->length, tmp, len);
|
|
return res;
|
|
}
|