STATIC int
RTADVSocketInitTXBuf(RTADVSocketRef sock, uint32_t * txbuf, bool lladdr_ok)
{
interface_t * if_p = RTADVSocketGetInterface(sock);
struct nd_router_solicit * ndrs;
int txbuf_used;
ndrs = (struct nd_router_solicit *)txbuf;
ndrs->nd_rs_type = ND_ROUTER_SOLICIT;
ndrs->nd_rs_code = 0;
ndrs->nd_rs_cksum = 0;
ndrs->nd_rs_reserved = 0;
txbuf_used = sizeof(struct nd_router_solicit);
/* if it's OK to include [RFC 4429], add source link-layer address option */
if (lladdr_ok && if_link_type(if_p) == IFT_ETHER) {
int opt_len;
struct nd_opt_hdr * ndopt;
opt_len = roundup(if_link_length(if_p) + sizeof(*ndopt), ND_OPT_ALIGN);
ndopt = (struct nd_opt_hdr *)(ndrs + 1);
ndopt->nd_opt_type = ND_OPT_SOURCE_LINKADDR;
ndopt->nd_opt_len = (opt_len / ND_OPT_ALIGN);
bcopy(if_link_address(if_p), (ndopt + 1), if_link_length(if_p));
txbuf_used += opt_len;
}
return (txbuf_used);
}
STATIC CFDataRef
make_DUID_LL_data(interface_t * if_p)
{
CFMutableDataRef data;
int duid_len;
DHCPDUID_LLRef ll_p;
duid_len = offsetof(DHCPDUID_LL, linklayer_address) + if_link_length(if_p);
data = CFDataCreateMutable(NULL, duid_len);
CFDataSetLength(data, duid_len);
ll_p = (DHCPDUID_LLRef)CFDataGetMutableBytePtr(data);
DHCPDUIDSetType((DHCPDUIDRef)ll_p, kDHCPDUIDTypeLL);
DHCPDUID_LLSetHardwareType(ll_p, if_link_arptype(if_p));
bcopy(if_link_address(if_p), ll_p->linklayer_address,
if_link_length(if_p));
return (data);
}
