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rip_output.original
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1989-03-04
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1KB
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55 lines
/*
* Generate IP header and pass packet to ip_output.
* Tack on options user may have setup with control call.
*/
rip_output(m0, so)
struct mbuf *m0;
struct socket *so;
{
register struct mbuf *m;
register struct ip *ip;
int len = 0, error;
struct rawcb *rp = sotorawcb(so);
struct sockaddr_in *sin;
/*
* Calculate data length and get an mbuf
* for IP header.
*/
for (m = m0; m; m = m->m_next)
len += m->m_len;
m = m_get(M_DONTWAIT, MT_HEADER);
if (m == 0) {
error = ENOBUFS;
goto bad;
}
/*
* Fill in IP header as needed.
*/
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 = rp->rcb_proto.sp_protocol;
ip->ip_len = sizeof(struct ip) + len;
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;
ip->ip_ttl = MAXTTL;
return (ip_output(m, rp->rcb_options, &rp->rcb_route,
(so->so_options & SO_DONTROUTE) | IP_ALLOWBROADCAST));
bad:
m_freem(m);
return (error);
}