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1.1 root 1: /*
2: * Copyright (c) 1984, 1985, 1986, 1987 Regents of the University of California.
3: * All rights reserved.
4: *
5: * Redistribution and use in source and binary forms, with or without
6: * modification, are permitted provided that the following conditions
7: * are met:
8: * 1. Redistributions of source code must retain the above copyright
9: * notice, this list of conditions and the following disclaimer.
10: * 2. Redistributions in binary form must reproduce the above copyright
11: * notice, this list of conditions and the following disclaimer in the
12: * documentation and/or other materials provided with the distribution.
13: * 3. All advertising materials mentioning features or use of this software
14: * must display the following acknowledgement:
15: * This product includes software developed by the University of
16: * California, Berkeley and its contributors.
17: * 4. Neither the name of the University nor the names of its contributors
18: * may be used to endorse or promote products derived from this software
19: * without specific prior written permission.
20: *
21: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31: * SUCH DAMAGE.
32: *
33: * @(#)ns_output.c 7.8 (Berkeley) 12/16/90
34: */
35:
36: #include "param.h"
37: #include "malloc.h"
38: #include "mbuf.h"
39: #include "errno.h"
40: #include "socket.h"
41: #include "socketvar.h"
42:
43: #include "../net/if.h"
44: #include "../net/route.h"
45:
46: #include "ns.h"
47: #include "ns_if.h"
48: #include "idp.h"
49: #include "idp_var.h"
50:
51: #ifdef vax
52: #include "vax/include/mtpr.h"
53: #endif
54: int ns_hold_output = 0;
55: int ns_copy_output = 0;
56: int ns_output_cnt = 0;
57: struct mbuf *ns_lastout;
58:
59: ns_output(m0, ro, flags)
60: struct mbuf *m0;
61: struct route *ro;
62: int flags;
63: {
64: register struct idp *idp = mtod(m0, struct idp *);
65: register struct ifnet *ifp = 0;
66: int error = 0;
67: struct route idproute;
68: struct sockaddr_ns *dst;
69: extern int idpcksum;
70:
71: if (ns_hold_output) {
72: if (ns_lastout) {
73: (void)m_free(ns_lastout);
74: }
75: ns_lastout = m_copy(m0, 0, (int)M_COPYALL);
76: }
77: /*
78: * Route packet.
79: */
80: if (ro == 0) {
81: ro = &idproute;
82: bzero((caddr_t)ro, sizeof (*ro));
83: }
84: dst = (struct sockaddr_ns *)&ro->ro_dst;
85: if (ro->ro_rt == 0) {
86: dst->sns_family = AF_NS;
87: dst->sns_len = sizeof (*dst);
88: dst->sns_addr = idp->idp_dna;
89: dst->sns_addr.x_port = 0;
90: /*
91: * If routing to interface only,
92: * short circuit routing lookup.
93: */
94: if (flags & NS_ROUTETOIF) {
95: struct ns_ifaddr *ia = ns_iaonnetof(&idp->idp_dna);
96:
97: if (ia == 0) {
98: error = ENETUNREACH;
99: goto bad;
100: }
101: ifp = ia->ia_ifp;
102: goto gotif;
103: }
104: rtalloc(ro);
105: } else if ((ro->ro_rt->rt_flags & RTF_UP) == 0) {
106: /*
107: * The old route has gone away; try for a new one.
108: */
109: rtfree(ro->ro_rt);
110: ro->ro_rt = NULL;
111: rtalloc(ro);
112: }
113: if (ro->ro_rt == 0 || (ifp = ro->ro_rt->rt_ifp) == 0) {
114: error = ENETUNREACH;
115: goto bad;
116: }
117: ro->ro_rt->rt_use++;
118: if (ro->ro_rt->rt_flags & (RTF_GATEWAY|RTF_HOST))
119: dst = (struct sockaddr_ns *)ro->ro_rt->rt_gateway;
120: gotif:
121:
122: /*
123: * Look for multicast addresses and
124: * and verify user is allowed to send
125: * such a packet.
126: */
127: if (dst->sns_addr.x_host.c_host[0]&1) {
128: if ((ifp->if_flags & IFF_BROADCAST) == 0) {
129: error = EADDRNOTAVAIL;
130: goto bad;
131: }
132: if ((flags & NS_ALLOWBROADCAST) == 0) {
133: error = EACCES;
134: goto bad;
135: }
136: }
137:
138: if (htons(idp->idp_len) <= ifp->if_mtu) {
139: ns_output_cnt++;
140: if (ns_copy_output) {
141: ns_watch_output(m0, ifp);
142: }
143: error = (*ifp->if_output)(ifp, m0,
144: (struct sockaddr *)dst, ro->ro_rt);
145: goto done;
146: } else error = EMSGSIZE;
147:
148:
149: bad:
150: if (ns_copy_output) {
151: ns_watch_output(m0, ifp);
152: }
153: m_freem(m0);
154: done:
155: if (ro == &idproute && (flags & NS_ROUTETOIF) == 0 && ro->ro_rt) {
156: RTFREE(ro->ro_rt);
157: ro->ro_rt = 0;
158: }
159: return (error);
160: }
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