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- /*
- * Copyright (c) 1982, 1986 Regents of the University of California.
- * All rights reserved. The Berkeley software License Agreement
- * specifies the terms and conditions for redistribution.
- *
- * @(#)raw_ip.c 1.11 89/01/16 SMI; from UCB 7.2 6/21/87
- */
-
- #include <sys/param.h>
- #include <sys/mbuf.h>
- #include <sys/socket.h>
- #include <sys/protosw.h>
- #include <sys/socketvar.h>
- #include <sys/errno.h>
-
- #include <net/if.h>
- #include <net/route.h>
- #include <net/raw_cb.h>
-
- #include <netinet/in.h>
- #include <netinet/in_systm.h>
- #include <netinet/ip.h>
- #include <netinet/ip_var.h>
-
- /*
- * Raw interface to IP protocol.
- */
-
- struct sockaddr_in ripdst = { AF_INET };
- struct sockaddr_in ripsrc = { AF_INET };
- struct sockproto ripproto = { PF_INET };
-
- /*
- * Setup generic address and protocol structures
- * for raw_input routine, then pass them along with
- * mbuf chain.
- */
- rip_input(m)
- struct mbuf *m;
- {
- register struct ip *ip = mtod(m, struct ip *);
-
- ripproto.sp_protocol = ip->ip_p;
- ripdst.sin_addr = ip->ip_dst;
- ripsrc.sin_addr = ip->ip_src;
- raw_input(m, &ripproto, (struct sockaddr *)&ripsrc,
- (struct sockaddr *)&ripdst);
- }
-
- /*
- * Generate IP header and pass packet to ip_output.
- * Tack on options user may have setup with control call.
- */
- 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 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 (so->so_proto->pr_protocol != 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_off = 0;
- ip->ip_tos = 0;
- ip->ip_p = rp->rcb_proto.sp_protocol;
- 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;
-
- return (ip_output(m, rp->rcb_options, &rp->rcb_route,
- (so->so_options & SO_DONTROUTE) | IP_ALLOWBROADCAST));
- bad:
- m_freem(m);
- return (error);
- }
-
- /*
- * Raw IP socket option processing.
- */
- rip_ctloutput(op, so, level, optname, m)
- int op;
- struct socket *so;
- int level, optname;
- struct mbuf **m;
- {
- int error = 0;
- register struct rawcb *rp = sotorawcb(so);
-
- if (level != IPPROTO_IP)
- error = EINVAL;
- else switch (op) {
-
- case PRCO_SETOPT:
- switch (optname) {
- case IP_OPTIONS:
- return (ip_pcbopts(&rp->rcb_options, *m));
-
- default:
- error = EINVAL;
- break;
- }
- break;
-
- case PRCO_GETOPT:
- switch (optname) {
- case IP_OPTIONS:
- *m = m_get(M_WAIT, MT_SOOPTS);
- if (rp->rcb_options) {
- (*m)->m_off = rp->rcb_options->m_off;
- (*m)->m_len = rp->rcb_options->m_len;
- bcopy(mtod(rp->rcb_options, caddr_t),
- mtod(*m, caddr_t), (unsigned)(*m)->m_len);
- } else
- (*m)->m_len = 0;
- break;
- default:
- error = EINVAL;
- break;
- }
- break;
- }
- if (op == PRCO_SETOPT && *m)
- (void)m_free(*m);
- return (error);
- }
-