bird/lib/net.c

#include "nest/bird.h"
#include "lib/ip.h"
#include "lib/net.h"


const u16 net_addr_length[] = {
  [NET_IP4] = sizeof(net_addr_ip4),
  [NET_IP6] = sizeof(net_addr_ip6),
  [NET_VPN4] = sizeof(net_addr_vpn4),
  [NET_VPN6] = sizeof(net_addr_vpn6)
};

const u8 net_max_prefix_length[] = {
  [NET_IP4] = IP4_MAX_PREFIX_LENGTH,
  [NET_IP6] = IP6_MAX_PREFIX_LENGTH,
  [NET_VPN4] = IP4_MAX_PREFIX_LENGTH,
  [NET_VPN6] = IP4_MAX_PREFIX_LENGTH
};

const u16 net_max_text_length[] = {
  [NET_IP4] = 18,	/* "255.255.255.255/32" */
  [NET_IP6] = 43,	/* "ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff/128" */
  [NET_VPN4] = 40,	/* "4294967296:4294967296 255.255.255.255/32" */
  [NET_VPN6] = 65,	/* "4294967296:4294967296 ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff/128" */
};


int
net_format(const net_addr *N, char *buf, int buflen)
{
  net_addr_union *n = (void *) N;

  /* XXXX fix %I vs %R */
  switch (n->n.type)
  {
  case NET_IP4:
    return bsnprintf(buf, buflen, "%R/%d", n->ip4.prefix, n->ip4.pxlen);
  case NET_IP6:
    return bsnprintf(buf, buflen, "%I/%d", n->ip6.prefix, n->ip6.pxlen);
  case NET_VPN4:
    return bsnprintf(buf, buflen, "%u:%u %R/%d", (u32) (n->vpn4.rd >> 32), (u32) n->vpn4.rd, n->vpn4.prefix, n->vpn4.pxlen);
  case NET_VPN6:
    return bsnprintf(buf, buflen, "%u:%u %I/%d", (u32) (n->vpn6.rd >> 32), (u32) n->vpn6.rd, n->vpn6.prefix, n->vpn6.pxlen);
  }

  return 0;
}

ip_addr
net_pxmask(const net_addr *a)
{
  switch (a->type)
  {
  case NET_IP4:
  case NET_VPN4:
    return ipa_from_ip4(ip4_mkmask(net4_pxlen(a)));

  case NET_IP6:
  case NET_VPN6:
    return ipa_from_ip6(ip6_mkmask(net6_pxlen(a)));

  default:
    return IPA_NONE;
  }
}

int
net_compare(const net_addr *a, const net_addr *b)
{
  if (a->type != b->type)
    return uint_cmp(a->type, b->type);

  switch (a->type)
  {
  case NET_IP4:
    return net_compare_ip4((const net_addr_ip4 *) a, (const net_addr_ip4 *) b);
  case NET_IP6:
    return net_compare_ip6((const net_addr_ip6 *) a, (const net_addr_ip6 *) b);
  case NET_VPN4:
    return net_compare_vpn4((const net_addr_vpn4 *) a, (const net_addr_vpn4 *) b);
  case NET_VPN6:
    return net_compare_vpn6((const net_addr_vpn6 *) a, (const net_addr_vpn6 *) b);
  }
  return 0;
}

int
net_validate(const net_addr *N)
{
  switch (N->type)
  {
  case NET_IP4:
  case NET_VPN4:
    return net_validate_ip4((net_addr_ip4 *) N);

  case NET_IP6:
  case NET_VPN6:
    return net_validate_ip6((net_addr_ip6 *) N);

  default:
    return 0;
  }
}

void
net_normalize(net_addr *N)
{
  net_addr_union *n = (void *) N;

  switch (n->n.type)
  {
  case NET_IP4:
  case NET_VPN4:
    return net_normalize_ip4(&n->ip4);

  case NET_IP6:
  case NET_VPN6:
    return net_normalize_ip6(&n->ip6);
  }
}

int
net_classify(const net_addr *N)
{
  net_addr_union *n = (void *) N;

  switch (n->n.type)
  {
  case NET_IP4:
  case NET_VPN4:
    return ip4_zero(n->ip4.prefix) ? (IADDR_HOST | SCOPE_UNIVERSE) : ip4_classify(n->ip4.prefix);

  case NET_IP6:
  case NET_VPN6:
    return ip6_zero(n->ip6.prefix) ? (IADDR_HOST | SCOPE_UNIVERSE) : ip6_classify(&n->ip6.prefix);
  }

  return 0;
}

int
ipa_in_netX(const ip_addr A, const net_addr *N)
{
  switch (N->type)
  {
  case NET_IP4:
  case NET_VPN4:
    if (!ipa_is_ip4(A)) return 0;
    break;

  case NET_IP6:
  case NET_VPN6:
    if (ipa_is_ip4(A)) return 0;
    break;
  }

  return ipa_zero(ipa_and(ipa_xor(A, net_prefix(N)), ipa_mkmask(net_pxlen(N))));
}

int
net_in_netX(const net_addr *A, const net_addr *N)
{
  if (A->type != N->type)
    return 0;

  return (net_pxlen(N) <= net_pxlen(A)) && ipa_in_netX(net_prefix(A), N);
}