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/* A sample version of rip_output() from /sys/netinet/raw_ip.c */
rip_output(m, so)
register struct mbuf *m;
struct socket *so;
{
register struct ip *ip;
int error;
struct rawcb *rp = sotorawcb(so);
struct sockaddr_in *sin;
#if BSD>=43
short proto = rp->rcb_proto.sp_protocol;
#else
short proto = so->so_proto->pr_protocol;
#endif
/*
* if the protocol is IPPROTO_RAW, the user handed us a
* complete IP packet. Otherwise, allocate an mbuf for a
* header and fill it in as needed.
*/
if (proto != IPPROTO_RAW) {
/*
* Calculate data length and get an mbuf
* for IP header.
*/
int len = 0;
struct mbuf *m0;
for (m0 = m; m; m = m->m_next)
len += m->m_len;
m = m_get(M_DONTWAIT, MT_HEADER);
if (m == 0) {
m = m0;
error = ENOBUFS;
goto bad;
}
m->m_off = MMAXOFF - sizeof(struct ip);
m->m_len = sizeof(struct ip);
m->m_next = m0;
ip = mtod(m, struct ip *);
ip->ip_tos = 0;
ip->ip_off = 0;
ip->ip_p = proto;
ip->ip_len = sizeof(struct ip) + len;
ip->ip_ttl = MAXTTL;
} else
ip = mtod(m, struct ip *);
if (rp->rcb_flags & RAW_LADDR) {
sin = (struct sockaddr_in *)&rp->rcb_laddr;
if (sin->sin_family != AF_INET) {
error = EAFNOSUPPORT;
goto bad;
}
ip->ip_src.s_addr = sin->sin_addr.s_addr;
} else
ip->ip_src.s_addr = 0;
ip->ip_dst = ((struct sockaddr_in *)&rp->rcb_faddr)->sin_addr;
#if BSD>=43
return (ip_output(m, rp->rcb_options, &rp->rcb_route,
(so->so_options & SO_DONTROUTE) | IP_ALLOWBROADCAST));
#else
return (ip_output(m, (struct mbuf *)0, &rp->rcb_route,
(so->so_options & SO_DONTROUTE) | IP_ALLOWBROADCAST));
#endif
bad:
m_freem(m);
return (error);
}
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