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