ER
in6_set_header (T_NET_BUF *nbuf, uint_t len,
T_IN6_ADDR *dstaddr, T_IN6_ADDR *srcaddr,
uint8_t next, uint8_t hlim)
{
T_IFNET *ifp = IF_GET_IFNET();
T_IP6_HDR *ip6h;
T_IN6_IFADDR *ia;
/*
* 宛先アドレスにふさわしい送信元アドレスを、
* ネットワークインタフェースから探索して利用する。
*/
if (srcaddr == NULL || !IN6_IS_ADDR_UNSPECIFIED(srcaddr))
;
else if ((ia = in6_ifawithifp(ifp, dstaddr)) == NULL)
return E_SYS;
else
srcaddr = &ia->addr;
/* IPv6 ヘッダを設定する。*/
ip6h = GET_IP6_HDR(nbuf);
ip6h->vcf = htonl(IP6_MAKE_VCF(IPV6_VERSION, 0));
ip6h->plen = htons(len);
ip6h->next = next;
ip6h->hlim = hlim;
if (dstaddr == NULL)
memset(&ip6h->dst, 0, sizeof(T_IN6_ADDR));
else
ip6h->dst = *dstaddr;
if (srcaddr == NULL)
memset(&ip6h->src, 0, sizeof(T_IN6_ADDR));
else
ip6h->src = *srcaddr;
return E_OK;
}
/*
* Output an Neighbor Solicitation Message. Caller specifies:
* - ICMP6 header source IP6 address
* - ND6 header target IP6 address
* - ND6 header source datalink address
*
* Based on RFC 2461
* Based on RFC 2462 (duplicated address detection)
*/
void
nd6_ns_output(struct ifnet *ifp, const struct in6_addr *daddr6,
const struct in6_addr *taddr6,
struct llinfo_nd6 *ln, /* for source address determination */
int dad) /* duplicated address detection */
{
struct mbuf *m;
struct ip6_hdr *ip6;
struct nd_neighbor_solicit *nd_ns;
struct in6_ifaddr *ia = NULL;
struct ip6_moptions im6o;
int icmp6len;
int maxlen;
caddr_t mac;
struct ifnet *outif = NULL;
if (IN6_IS_ADDR_MULTICAST(taddr6))
return;
/* estimate the size of message */
maxlen = sizeof(*ip6) + sizeof(*nd_ns);
maxlen += (sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7;
if (max_linkhdr + maxlen >= MCLBYTES) {
#ifdef DIAGNOSTIC
kprintf("nd6_ns_output: max_linkhdr + maxlen >= MCLBYTES "
"(%d + %d > %d)\n", max_linkhdr, maxlen, MCLBYTES);
#endif
return;
}
m = m_getb(max_linkhdr + maxlen, MB_DONTWAIT, MT_DATA, M_PKTHDR);
if (m == NULL)
return;
if (daddr6 == NULL || IN6_IS_ADDR_MULTICAST(daddr6)) {
m->m_flags |= M_MCAST;
im6o.im6o_multicast_ifp = ifp;
im6o.im6o_multicast_hlim = 255;
im6o.im6o_multicast_loop = 0;
}
icmp6len = sizeof(*nd_ns);
m->m_pkthdr.len = m->m_len = sizeof(*ip6) + icmp6len;
m->m_data += max_linkhdr; /* or MH_ALIGN() equivalent? */
/* fill neighbor solicitation packet */
ip6 = mtod(m, struct ip6_hdr *);
ip6->ip6_flow = 0;
ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
ip6->ip6_vfc |= IPV6_VERSION;
/* ip6->ip6_plen will be set later */
ip6->ip6_nxt = IPPROTO_ICMPV6;
ip6->ip6_hlim = 255;
if (daddr6)
ip6->ip6_dst = *daddr6;
else {
ip6->ip6_dst.s6_addr16[0] = IPV6_ADDR_INT16_MLL;
ip6->ip6_dst.s6_addr16[1] = htons(ifp->if_index);
ip6->ip6_dst.s6_addr32[1] = 0;
ip6->ip6_dst.s6_addr32[2] = IPV6_ADDR_INT32_ONE;
ip6->ip6_dst.s6_addr32[3] = taddr6->s6_addr32[3];
ip6->ip6_dst.s6_addr8[12] = 0xff;
}
if (!dad) {
#if 0 /* KAME way, exact address scope match */
/*
* Select a source whose scope is the same as that of the dest.
* Typically, the dest is link-local solicitation multicast
* (i.e. neighbor discovery) or link-local/global unicast
* (i.e. neighbor un-reachability detection).
*/
ia = in6_ifawithifp(ifp, &ip6->ip6_dst);
if (ia == NULL) {
m_freem(m);
return;
}
ip6->ip6_src = ia->ia_addr.sin6_addr;
#else /* spec-wise correct */
/*
* RFC2461 7.2.2:
* "If the source address of the packet prompting the
* solicitation is the same as one of the addresses assigned
* to the outgoing interface, that address SHOULD be placed
* in the IP Source Address of the outgoing solicitation.
* Otherwise, any one of the addresses assigned to the
* interface should be used."
*
* We use the source address for the prompting packet
* (saddr6), if:
* - saddr6 is given from the caller (by giving "ln"), and
* - saddr6 belongs to the outgoing interface.
* Otherwise, we perform a scope-wise match.
*/
struct ip6_hdr *hip6; /* hold ip6 */
struct in6_addr *saddr6;
if (ln && ln->ln_hold) {
hip6 = mtod(ln->ln_hold, struct ip6_hdr *);
/* XXX pullup? */
if (sizeof(*hip6) < ln->ln_hold->m_len)
saddr6 = &hip6->ip6_src;
else
saddr6 = NULL;
} else
