int ndisc_send_na(int ifindex, const struct in6_addr *src,
const struct in6_addr *dst,
const struct in6_addr *target, uint32_t flags)
{
struct nd_neighbor_advert *na;
struct iovec iov[2];
uint8_t l2addr[L2ADDR_MAX_SIZE];
int len, iovlen = 0;
memset(iov, 0, sizeof(iov));
if ((len = ndisc_l2addr_to_opt(ifindex, l2addr)) < 0)
return -EINVAL;
na = icmp6_create(iov, ND_NEIGHBOR_ADVERT, iovlen++);
if (na == NULL)
return -ENOMEM;
if (len > 0) {
if (nd_opt_create(&iov[iovlen], ND_OPT_TARGET_LINKADDR,
len, l2addr) == NULL) {
free_iov_data(iov, iovlen);
return -ENOMEM;
}
iovlen++;
}
na->nd_na_target = *target;
na->nd_na_flags_reserved = flags;
icmp6_send(ifindex, 255, src, dst, iov, iovlen);
free_iov_data(iov, iovlen);
statistics_inc(&mipl_stat, MIPL_STATISTICS_OUT_NA);
return 0;
}
static int ndisc_send_unspec(int oif, const struct in6_addr *dest,
uint8_t *hdr, int hdrlen, struct iovec *optv,
size_t optvlen)
{
struct {
struct ip6_hdr ip;
struct icmp6_hdr icmp;
uint8_t data[1500];
} frame;
struct msghdr msgh;
struct cmsghdr *cmsg;
struct in6_pktinfo *pinfo;
struct sockaddr_in6 dst;
char cbuf[CMSG_SPACE(sizeof(*pinfo))];
struct iovec iov;
uint8_t *data = (uint8_t *)(&frame.icmp);
int type, fd, ret, remlen, datalen = 0, written = 0, v = 1;
if (hdr == NULL || hdrlen < 0 ||
(size_t)hdrlen < sizeof(struct icmp6_hdr) ||
(size_t)hdrlen > (sizeof(frame) - sizeof(struct ip6_hdr)))
return -EINVAL;
if ((fd = socket(AF_INET6, SOCK_RAW, IPPROTO_RAW)) < 0)
return -1;
if (setsockopt(fd, IPPROTO_IPV6, IP_HDRINCL, &v, sizeof(v)) < 0) {
dbg("cannot set IP_HDRINCL: %s\n", strerror(errno));
close(fd);
return -errno;
}
memset(&frame, 0, sizeof(frame));
memset(&dst, 0, sizeof(dst));
dst.sin6_addr = *dest;
/* Copy ICMPv6 header and update various length values */
memcpy(data, hdr, hdrlen);
data += hdrlen;
datalen += hdrlen;
remlen = sizeof(frame) - sizeof(struct ip6_hdr) - hdrlen;
/* Prepare for csum: write trailing options by linearizing iov */
if ((iov_linearize(data, remlen, optv, optvlen, &written) != 0) ||
(written & 0x1)) /* Ensure length is even for csum() */
return -1;
datalen += written;
/* Fill in the IPv6 header */
frame.ip.ip6_vfc = 0x60;
frame.ip.ip6_plen = htons(datalen);
frame.ip.ip6_nxt = IPPROTO_ICMPV6;
frame.ip.ip6_hlim = 255;
frame.ip.ip6_dst = *dest;
/* all other fields are already set to zero */
frame.icmp.icmp6_cksum = in6_cksum(&in6addr_any, dest, &frame.icmp,
datalen, IPPROTO_ICMPV6);
iov.iov_base = &frame;
iov.iov_len = sizeof(frame.ip) + datalen;
dst.sin6_family = AF_INET6;
msgh.msg_name = &dst;
msgh.msg_namelen = sizeof(dst);
msgh.msg_iov = &iov;
msgh.msg_iovlen = 1;
msgh.msg_flags = 0;
memset(cbuf, 0, CMSG_SPACE(sizeof(*pinfo)));
cmsg = (struct cmsghdr *)cbuf;
pinfo = (struct in6_pktinfo *)CMSG_DATA(cmsg);
pinfo->ipi6_ifindex = oif;
cmsg->cmsg_len = CMSG_LEN(sizeof(*pinfo));
cmsg->cmsg_level = IPPROTO_IPV6;
cmsg->cmsg_type = IPV6_PKTINFO;
msgh.msg_control = cmsg;
msgh.msg_controllen = cmsg->cmsg_len;
ret = sendmsg(fd, &msgh, 0);
if (ret < 0)
dbg("sendmsg: %s\n", strerror(errno));
close(fd);
type = hdr[0];
if (type == ND_NEIGHBOR_SOLICIT) {
statistics_inc(&mipl_stat, MIPL_STATISTICS_OUT_NS_UNSPEC);
} else if (type == ND_ROUTER_SOLICIT) {
statistics_inc(&mipl_stat, MIPL_STATISTICS_OUT_RS_UNSPEC);
}
return ret;
}