static int
getsockopt_ipv6_ifindex (struct msghdr *msgh)
{
struct in6_pktinfo *pktinfo;
pktinfo = getsockopt_cmsg_data (msgh, IPPROTO_IPV6, IPV6_PKTINFO);
return pktinfo->ipi6_ifindex;
}
/*
* Requires: msgh is not NULL and points to a valid struct msghdr, which
* may or may not have control data about the incoming interface.
*
* Returns the interface index (small integer >= 1) if it can be
* determined, or else 0.
*/
static int
getsockopt_ipv4_ifindex (struct msghdr *msgh)
{
/* XXX: initialize to zero? (Always overwritten, so just cosmetic.) */
int ifindex = -1;
/* Linux pktinfo based ifindex retrieval */
struct in_pktinfo *pktinfo;
pktinfo =
(struct in_pktinfo *)getsockopt_cmsg_data (msgh, IPPROTO_IP, IP_PKTINFO);
/* XXX Can pktinfo be NULL? Clean up post 0.98. */
ifindex = pktinfo->ipi_ifindex;
return ifindex;
}
/*
* Requires: msgh is not NULL and points to a valid struct msghdr, which
* may or may not have control data about the incoming interface.
*
* Returns the interface index (small integer >= 1) if it can be
* determined, or else 0.
*/
static int
getsockopt_ipv4_ifindex (struct msghdr *msgh)
{
/* XXX: initialize to zero? (Always overwritten, so just cosmetic.) */
int ifindex = -1;
#if defined(IP_PKTINFO)
/* Linux pktinfo based ifindex retrieval */
struct in_pktinfo *pktinfo;
pktinfo =
(struct in_pktinfo *)getsockopt_cmsg_data (msgh, IPPROTO_IP, IP_PKTINFO);
/* XXX Can pktinfo be NULL? Clean up post 0.98. */
ifindex = pktinfo->ipi_ifindex;
#elif defined(IP_RECVIF)
/* retrieval based on IP_RECVIF */
#ifndef SUNOS_5
/* BSD systems use a sockaddr_dl as the control message payload. */
struct sockaddr_dl *sdl;
#else
/* SUNOS_5 uses an integer with the index. */
int *ifindex_p;
#endif /* SUNOS_5 */
#ifndef SUNOS_5
/* BSD */
sdl =
(struct sockaddr_dl *)getsockopt_cmsg_data (msgh, IPPROTO_IP, IP_RECVIF);
if (sdl != NULL)
ifindex = sdl->sdl_index;
else
ifindex = 0;
#else
/*
* Solaris. On Solaris 8, IP_RECVIF is defined, but the call to
* enable it fails with errno=99, and the struct msghdr has
* controllen 0.
*/
ifindex_p = (uint_t *)getsockopt_cmsg_data (msgh, IPPROTO_IP, IP_RECVIF);
if (ifindex_p != NULL)
ifindex = *ifindex_p;
else
ifindex = 0;
#endif /* SUNOS_5 */
#else
/*
* Neither IP_PKTINFO nor IP_RECVIF defined - warn at compile time.
* XXX Decide if this is a core service, or if daemons have to cope.
* Since Solaris 8 and OpenBSD seem not to provide it, it seems that
* daemons have to cope.
*/
#warning "getsockopt_ipv4_ifindex: Neither IP_PKTINFO nor IP_RECVIF defined."
#warning "Some daemons may fail to operate correctly!"
ifindex = 0;
#endif /* IP_PKTINFO */
return ifindex;
}