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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef NETWORK_IPV6_UTILS_H_
#define NETWORK_IPV6_UTILS_H_
namespace mozilla {
namespace net {
namespace utils {
// IPv6 address scopes.
#define IPV6_SCOPE_GLOBAL 0 // Global scope.
#define IPV6_SCOPE_LINKLOCAL 1 // Link-local scope.
#define IPV6_SCOPE_SITELOCAL 2 // Site-local scope (deprecated).
#define IPV6_SCOPE_UNIQUELOCAL 3 // Unique local
#define IPV6_SCOPE_NODELOCAL 4 // Loopback
// Return the scope of the given address.
static int ipv6_scope(const unsigned char addr[16]) {
const unsigned char* b = addr;
unsigned short w = (unsigned short)((b[0] << 8) | b[1]);
if ((b[0] & 0xFE) == 0xFC) {
return IPV6_SCOPE_UNIQUELOCAL;
}
switch (w & 0xFFC0) {
case 0xFE80:
return IPV6_SCOPE_LINKLOCAL;
case 0xFEC0:
return IPV6_SCOPE_SITELOCAL;
case 0x0000:
w = b[1] | b[2] | b[3] | b[4] | b[5] | b[6] | b[7] | b[8] | b[9] | b[10] |
b[11] | b[12] | b[13] | b[14];
if (w || b[15] != 0x01) {
break;
}
return IPV6_SCOPE_NODELOCAL;
default:
break;
}
return IPV6_SCOPE_GLOBAL;
}
} // namespace utils
} // namespace net
} // namespace mozilla
#endif // NETWORK_IPV6_UTILS_H_