Make all network interrupt service routines MPSAFE part 1/3.
[dragonfly.git] / sys / netproto / ns / ns_output.c
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1/*
2 * Copyright (c) 1984, 1985, 1986, 1987, 1993
3 * The Regents of the University of California. 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 8.1 (Berkeley) 6/10/93
34 * $FreeBSD: src/sys/netns/ns_output.c,v 1.7 1999/08/28 00:49:51 peter Exp $
78195a76 35 * $DragonFly: src/sys/netproto/ns/ns_output.c,v 1.7 2005/11/28 17:13:47 dillon Exp $
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36 */
37
38#include <sys/param.h>
39#include <sys/malloc.h>
40#include <sys/mbuf.h>
41#include <sys/errno.h>
42#include <sys/socket.h>
43#include <sys/socketvar.h>
44
45#include <net/if.h>
46#include <net/route.h>
47
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48#include "ns.h"
49#include "ns_if.h"
50#include "idp.h"
51#include "idp_var.h"
984263bc 52
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53int ns_hold_output = 0;
54int ns_copy_output = 0;
55int ns_output_cnt = 0;
56struct mbuf *ns_lastout;
57
7b51e07b 58int
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59ns_output(m0, ro, flags)
60 struct mbuf *m0;
61 struct route *ro;
62 int flags;
63{
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64 struct idp *idp = mtod(m0, struct idp *);
65 struct ifnet *ifp = 0;
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66 int error = 0;
67 struct route idproute;
68 struct sockaddr_ns *dst;
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69
70 if (ns_hold_output) {
71 if (ns_lastout) {
72 (void)m_free(ns_lastout);
73 }
74 ns_lastout = m_copy(m0, 0, (int)M_COPYALL);
75 }
76 /*
77 * Route packet.
78 */
79 if (ro == 0) {
80 ro = &idproute;
81 bzero((caddr_t)ro, sizeof (*ro));
82 }
83 dst = (struct sockaddr_ns *)&ro->ro_dst;
84 if (ro->ro_rt == 0) {
85 dst->sns_family = AF_NS;
86 dst->sns_len = sizeof (*dst);
87 dst->sns_addr = idp->idp_dna;
88 dst->sns_addr.x_port = 0;
89 /*
90 * If routing to interface only,
91 * short circuit routing lookup.
92 */
93 if (flags & NS_ROUTETOIF) {
94 struct ns_ifaddr *ia = ns_iaonnetof(&idp->idp_dna);
95
96 if (ia == 0) {
97 error = ENETUNREACH;
98 goto bad;
99 }
100 ifp = ia->ia_ifp;
101 goto gotif;
102 }
103 rtalloc(ro);
104 } else if ((ro->ro_rt->rt_flags & RTF_UP) == 0) {
105 /*
106 * The old route has gone away; try for a new one.
107 */
108 rtfree(ro->ro_rt);
109 ro->ro_rt = NULL;
110 rtalloc(ro);
111 }
112 if (ro->ro_rt == 0 || (ifp = ro->ro_rt->rt_ifp) == 0) {
113 error = ENETUNREACH;
114 goto bad;
115 }
116 ro->ro_rt->rt_use++;
117 if (ro->ro_rt->rt_flags & (RTF_GATEWAY|RTF_HOST))
118 dst = (struct sockaddr_ns *)ro->ro_rt->rt_gateway;
119gotif:
120
121 /*
122 * Look for multicast addresses and
123 * and verify user is allowed to send
124 * such a packet.
125 */
126 if (dst->sns_addr.x_host.c_host[0]&1) {
127 if ((ifp->if_flags & IFF_BROADCAST) == 0) {
128 error = EADDRNOTAVAIL;
129 goto bad;
130 }
131 if ((flags & NS_ALLOWBROADCAST) == 0) {
132 error = EACCES;
133 goto bad;
134 }
135 }
136
137 if (htons(idp->idp_len) <= ifp->if_mtu) {
138 ns_output_cnt++;
139 if (ns_copy_output) {
140 ns_watch_output(m0, ifp);
141 }
78195a76 142 lwkt_serialize_enter(ifp->if_serializer);
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143 error = (*ifp->if_output)(ifp, m0,
144 (struct sockaddr *)dst, ro->ro_rt);
78195a76 145 lwkt_serialize_exit(ifp->if_serializer);
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146 goto done;
147 } else error = EMSGSIZE;
148
149
150bad:
151 if (ns_copy_output) {
152 ns_watch_output(m0, ifp);
153 }
154 m_freem(m0);
155done:
156 if (ro == &idproute && (flags & NS_ROUTETOIF) == 0 && ro->ro_rt) {
157 RTFREE(ro->ro_rt);
158 ro->ro_rt = 0;
159 }
160 return (error);
161}