mirror of
https://github.com/freebsd/freebsd-src.git
synced 2024-12-01 21:33:04 +00:00
74 lines
1.6 KiB
C
74 lines
1.6 KiB
C
/* 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);
|
|
}
|