Merge commit '3fb70b26faca6788aa0bdf1d558414f9f777c6cd' into haugesund

1 files changed, 695 insertions, 0 deletions

diff --git a/lib/a-set.c b/lib/a-set.c
new file mode 100644
index 00000000..8ede9b83
--- /dev/null
+++ b/lib/a-set.c
@@ -0,0 +1,695 @@
+/*
+ *	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 <stdlib.h>
+
+#include "nest/bird.h"
+#include "nest/rt.h"
+#include "lib/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(const 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];
+  const char *kind;
+
+  type = ec >> 48;
+  kind = ec_subtype_str(type & 0xf0ff);
+
+  if (!kind) {
+    bsprintf(tbuf, "unknown 0x%x", type);
+    kind = tbuf;
+  }
+
+  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(const 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(const 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(const 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(const 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(const 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;
+}
+
+const struct adata *
+int_set_prepend(struct linpool *pool, const 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 + 4, list->data, list->length);
+
+  * (u32 *) res->data = val;
+
+  return res;
+}
+
+const struct adata *
+int_set_add(struct linpool *pool, const 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 *) (res->data + len) = val;
+
+  return res;
+}
+
+const struct adata *
+ec_set_add(struct linpool *pool, const 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;
+}
+
+const struct adata *
+lc_set_add(struct linpool *pool, const 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;
+}
+
+const struct adata *
+int_set_del(struct linpool *pool, const 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;
+}
+
+const struct adata *
+ec_set_del(struct linpool *pool, const 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;
+}
+
+const struct adata *
+lc_set_del(struct linpool *pool, const 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;
+}
+
+const struct adata *
+int_set_union(struct linpool *pool, const struct adata *l1, const 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;
+}
+
+const struct adata *
+ec_set_union(struct linpool *pool, const struct adata *l1, const 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;
+}
+
+const struct adata *
+lc_set_union(struct linpool *pool, const struct adata *l1, const 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;
+}
+
+
+struct adata *
+ec_set_del_nontrans(struct linpool *pool, const struct adata *set)
+{
+  adata *res = lp_alloc_adata(pool, set->length);
+  u32 *src = int_set_get_data(set);
+  u32 *dst = int_set_get_data(res);
+  int len = int_set_get_size(set);
+  int i;
+
+  /* Remove non-transitive communities (EC_TBIT set) */
+  for (i = 0; i < len; i += 2)
+  {
+    if (src[i] & EC_TBIT)
+      continue;
+
+    *dst++ = src[i];
+    *dst++ = src[i+1];
+  }
+
+  res->length = ((byte *) dst) - res->data;
+
+  return res;
+}
+
+static int
+int_set_cmp(const void *X, const void *Y)
+{
+  const u32 *x = X, *y = Y;
+  return (*x < *y) ? -1 : (*x > *y) ? 1 : 0;
+}
+
+struct adata *
+int_set_sort(struct linpool *pool, const struct adata *src)
+{
+  struct adata *dst = lp_alloc_adata(pool, src->length);
+  memcpy(dst->data, src->data, src->length);
+  qsort(dst->data, dst->length / 4, 4, int_set_cmp);
+  return dst;
+}
+
+int
+int_set_min(const struct adata *list, u32 *val)
+{
+  if (!list)
+    return 0;
+
+  u32 *l = (u32 *) list->data;
+  int len = int_set_get_size(list);
+  int i;
+
+  if (len < 1)
+    return 0;
+
+  *val = *l++;
+  for (i = 1; i < len; i++, l++)
+    if (int_set_cmp(val, l) > 0)
+      *val = *l;
+
+  return 1;
+}
+
+int
+int_set_max(const struct adata *list, u32 *val)
+{
+  if (!list)
+    return 0;
+
+  u32 *l = (u32 *) list->data;
+  int len = int_set_get_size(list);
+  int i;
+
+  if (len < 1)
+    return 0;
+
+  *val = *l++;
+  for (i = 1; i < len; i++, l++)
+    if (int_set_cmp(val, l) < 0)
+      *val = *l;
+
+  return 1;
+}
+
+
+static int
+ec_set_cmp(const void *X, const void *Y)
+{
+  u64 x = ec_get(X, 0);
+  u64 y = ec_get(Y, 0);
+  return (x < y) ? -1 : (x > y) ? 1 : 0;
+}
+
+struct adata *
+ec_set_sort(struct linpool *pool, const struct adata *src)
+{
+  struct adata *dst = lp_alloc_adata(pool, src->length);
+  memcpy(dst->data, src->data, src->length);
+  qsort(dst->data, dst->length / 8, 8, ec_set_cmp);
+  return dst;
+}
+
+void
+ec_set_sort_x(struct adata *set)
+{
+  /* Sort in place */
+  qsort(set->data, set->length / 8, 8, ec_set_cmp);
+}
+
+int
+ec_set_min(const struct adata *list, u64 *val)
+{
+  if (!list)
+    return 0;
+
+  u32 *l = int_set_get_data(list);
+  int len = int_set_get_size(list);
+  int i;
+
+  if (len < 1)
+    return 0;
+
+  u32 *res = l; l += 2;
+  for (i = 2; i < len; i += 2, l += 2)
+    if (ec_set_cmp(res, l) > 0)
+      res = l;
+
+  *val = ec_generic(res[0], res[1]);
+  return 1;
+}
+
+int
+ec_set_max(const struct adata *list, u64 *val)
+{
+  if (!list)
+    return 0;
+
+  u32 *l = int_set_get_data(list);
+  int len = int_set_get_size(list);
+  int i;
+
+  if (len < 1)
+    return 0;
+
+  u32 *res = l; l += 2;
+  for (i = 2; i < len; i += 2, l += 2)
+    if (ec_set_cmp(res, l) < 0)
+      res = l;
+
+  *val = ec_generic(res[0], res[1]);
+  return 1;
+}
+
+
+static int
+lc_set_cmp(const void *X, const void *Y)
+{
+  const u32 *x = X, *y = Y;
+  if (x[0] != y[0])
+    return (x[0] > y[0]) ? 1 : -1;
+  if (x[1] != y[1])
+    return (x[1] > y[1]) ? 1 : -1;
+  if (x[2] != y[2])
+    return (x[2] > y[2]) ? 1 : -1;
+  return 0;
+}
+
+struct adata *
+lc_set_sort(struct linpool *pool, const struct adata *src)
+{
+  struct adata *dst = lp_alloc_adata(pool, src->length);
+  memcpy(dst->data, src->data, src->length);
+  qsort(dst->data, dst->length / LCOMM_LENGTH, LCOMM_LENGTH, lc_set_cmp);
+  return dst;
+}
+
+int
+lc_set_min(const 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;
+
+  if (len < 1)
+    return 0;
+
+  u32 *res = l; l += 3;
+  for (i = 3; i < len; i += 3, l += 3)
+    if (lc_set_cmp(res, l) > 0)
+      res = l;
+
+  *val = (lcomm) { res[0], res[1], res[2] };
+  return 1;
+}
+
+int
+lc_set_max(const 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;
+
+  if (len < 1)
+    return 0;
+
+  u32 *res = l; l += 3;
+  for (i = 3; i < len; i += 3, l += 3)
+    if (lc_set_cmp(res, l) < 0)
+      res = l;
+
+  *val = (lcomm) { res[0], res[1], res[2] };
+  return 1;
+}