// Netlink gives us the prefix length as a bit count. We need to turn
// that into a BSD-compatible netmask represented by a sockaddr*.
void SetNetmask(int family, size_t prefix_length) {
// ...and work out the netmask from the prefix length.
netmask.ss_family = family;
uint8_t* dst = SockaddrBytes(family, &netmask);
memset(dst, 0xff, prefix_length / 8);
if ((prefix_length % 8) != 0) {
dst[prefix_length/8] = (0xff << (8 - (prefix_length % 8)));
}
ifa.ifa_netmask = reinterpret_cast<sockaddr*>(&netmask);
}
sockaddr* CopyAddress(int family, const void* data, size_t byteCount, sockaddr_storage* ss) {
// Netlink gives us the address family in the header, and the
// sockaddr_in or sockaddr_in6 bytes as the payload. We need to
// stitch the two bits together into the sockaddr that's part of
// our portable interface.
ss->ss_family = family;
memcpy(SockaddrBytes(family, ss), data, byteCount);
// For IPv6 we might also have to set the scope id.
if (family == AF_INET6 && (IN6_IS_ADDR_LINKLOCAL(data) || IN6_IS_ADDR_MC_LINKLOCAL(data))) {
reinterpret_cast<sockaddr_in6*>(ss)->sin6_scope_id = interface_index;
}
return reinterpret_cast<sockaddr*>(ss);
}
void SetBroadcastAddress(int family, const void* data, size_t byteCount) {
ifa_ifu.ss_family = family;
memcpy(SockaddrBytes(family, &ifa_ifu), data, byteCount);
ifa.ifa_dstaddr = reinterpret_cast<sockaddr*>(&ifa_ifu);
}
// Netlink gives us the address family in the header, and the
// sockaddr_in or sockaddr_in6 bytes as the payload. We need to
// stitch the two bits together into the sockaddr that's part of
// our portable interface.
void SetAddress(int family, const void* data, size_t byteCount) {
addr.ss_family = family;
memcpy(SockaddrBytes(family, &addr), data, byteCount);
ifa.ifa_addr = reinterpret_cast<sockaddr*>(&addr);
}
