Parallelize in_ifaddrhead operation
[dragonfly.git] / sys / netproto / atm / ipatm / ipatm_output.c
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1/*
2 *
3 * ===================================
4 * HARP | Host ATM Research Platform
5 * ===================================
6 *
7 *
8 * This Host ATM Research Platform ("HARP") file (the "Software") is
9 * made available by Network Computing Services, Inc. ("NetworkCS")
10 * "AS IS". NetworkCS does not provide maintenance, improvements or
11 * support of any kind.
12 *
13 * NETWORKCS MAKES NO WARRANTIES OR REPRESENTATIONS, EXPRESS OR IMPLIED,
14 * INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF MERCHANTABILITY
15 * AND FITNESS FOR A PARTICULAR PURPOSE, AS TO ANY ELEMENT OF THE
16 * SOFTWARE OR ANY SUPPORT PROVIDED IN CONNECTION WITH THIS SOFTWARE.
17 * In no event shall NetworkCS be responsible for any damages, including
18 * but not limited to consequential damages, arising from or relating to
19 * any use of the Software or related support.
20 *
21 * Copyright 1994-1998 Network Computing Services, Inc.
22 *
23 * Copies of this Software may be made, however, the above copyright
24 * notice must be reproduced on all copies.
25 *
26 * @(#) $FreeBSD: src/sys/netatm/ipatm/ipatm_output.c,v 1.4.2.1 2000/06/02 22:39:08 archie Exp $
1b562c24 27 * @(#) $DragonFly: src/sys/netproto/atm/ipatm/ipatm_output.c,v 1.8 2008/06/08 08:38:05 sephe Exp $
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28 */
29
30/*
31 * IP Over ATM Support
32 * -------------------
33 *
34 * Output IP packets across an ATM VCC
35 *
36 */
37
d2438d69 38#include <netproto/atm/kern_include.h>
984263bc 39
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40#include "ipatm_var.h"
41#include "ipatm_serv.h"
984263bc 42
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43/*
44 * Output an IP Packet
45 *
46 * All IP packets output to an ATM interface will be directed here via
47 * the atm_ifoutput() function. If there is an ATM VCC already setup for
48 * the destination IP address, then we'll just send the packet to that VCC.
49 * Otherwise we will have to setup a new VCC, ARPing for the corresponding
50 * destination ATM hardware address along the way.
51 *
52 * Arguments:
53 * ifp pointer to ifnet structure
54 * m pointer to packet buffer chain to be output
55 * dst pointer to packet's IP destination address
56 *
57 * Returns:
58 * 0 packet "output" was successful
59 * errno output failed - reason indicated
60 *
61 */
62int
9855a82b 63ipatm_ifoutput(struct ifnet *ifp, KBuffer *m, struct sockaddr *dst)
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64{
65 struct ipvcc *ivp;
66 int err = 0;
67
68#ifdef DIAGNOSTIC
69 if (ipatm_print) {
70 atm_pdu_print(m, "ipatm_ifoutput");
71 }
72#endif
73
74 /*
75 * See if we've already got an appropriate VCC
76 */
77 ivp = ipatm_iptovc((struct sockaddr_in *)dst, (struct atm_nif *)ifp);
78 if (ivp) {
79
80 /*
81 * Reset idle timer
82 */
83 ivp->iv_idle = 0;
84
85 /*
86 * Can we use this VCC now??
87 */
88 if ((ivp->iv_state == IPVCC_ACTIVE) &&
89 (ivp->iv_flags & IVF_MAPOK)) {
90
91 /*
92 * OK, now send packet
93 */
94 err = atm_cm_cpcs_data(ivp->iv_conn, m);
95 if (err) {
96 /*
97 * Output problem, drop packet
98 */
99 KB_FREEALL(m);
100 }
101 } else {
102
103 /*
104 * VCC is unavailable for data packets. Queue packet
105 * for now, but only maintain a queue length of one.
106 */
107 if (ivp->iv_queue)
108 KB_FREEALL(ivp->iv_queue);
109
110 ivp->iv_queue = m;
111 }
112 } else {
1b562c24 113 struct in_ifaddr_container *iac;
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114
115 /*
116 * No VCC to destination
117 */
118
119 /*
120 * Is packet for our interface address?
121 */
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122 TAILQ_FOREACH(iac, &in_ifaddrheads[mycpuid], ia_link) {
123 struct in_ifaddr *ia = iac->ia;
124
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125 if (ia->ia_ifp != ifp)
126 continue;
127 if (((struct sockaddr_in *)dst)->sin_addr.s_addr ==
128 IA_SIN(ia)->sin_addr.s_addr) {
129
130 /*
131 * It's for us - hand packet to loopback driver
132 */
9855a82b 133 if_simloop(ifp, m, dst->sa_family, 0);
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134 goto done;
135 }
136 }
137
138 /*
139 * Is this a broadcast packet ??
140 */
984263bc 141 if (in_broadcast(((struct sockaddr_in *)dst)->sin_addr, ifp)) {
984263bc 142 struct ip_nif *inp;
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143
144 /*
145 * If interface server exists and provides broadcast
146 * services, then let it deal with this packet
147 */
0139ebde 148 crit_enter();
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149 for (inp = ipatm_nif_head; inp; inp = inp->inf_next) {
150 if (inp->inf_nif == (struct atm_nif *)ifp)
151 break;
152 }
0139ebde 153 crit_exit();
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154
155 if ((inp == NULL) ||
156 (inp->inf_serv == NULL) ||
157 (inp->inf_serv->is_bcast_output == NULL)) {
158 KB_FREEALL(m);
159 err = EADDRNOTAVAIL;
160 goto done;
161 }
162
163 err = (*inp->inf_serv->is_bcast_output)(inp, m);
164 goto done;
165 }
166
167 /*
168 * How about a multicast packet ??
169 */
170 if (IN_MULTICAST(ntohl(SATOSIN(dst)->sin_addr.s_addr))) {
171 /*
172 * Multicast isn't currently supported
173 */
174 KB_FREEALL(m);
175 err = EADDRNOTAVAIL;
176 goto done;
177 }
178
179 /*
180 * Well, I guess we need to create an SVC to the destination
181 */
182 if ((err = ipatm_createsvc(ifp, AF_INET,
183 (caddr_t)&((struct sockaddr_in *)dst)->sin_addr,
184 &ivp)) == 0) {
185 /*
186 * SVC open is proceeding, queue packet
187 */
188 ivp->iv_queue = m;
189
190 } else {
191 /*
192 * SVC open failed, release buffers and return
193 */
194 KB_FREEALL(m);
195 }
196 }
197
198done:
199 return (err);
200}
201