1 /*-
2 * Copyright (c) 2003-2004 Benno Rice <benno@eloquent.com.au>
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 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 * $FreeBSD: src/sys/netgraph/ng_atmllc.c,v 1.4 2008/10/23 15:53:51 des Exp $
27 */
28
29 #include <sys/param.h>
30 #include <sys/systm.h>
31 #include <sys/kernel.h>
32 #include <sys/malloc.h>
33 #include <sys/mbuf.h>
34 #include <sys/socket.h>
35 #include <sys/sockio.h>
36
37 #include <netgraph/ng_message.h>
38 #include <netgraph/netgraph.h>
39 #include <netgraph/ng_atmllc.h>
40
41 #include <net/if.h>
42 #include <net/ethernet.h> /* for M_HASFCS and ETHER_HDR_LEN */
43 #include <net/if_atm.h> /* for struct atmllc */
44
45 #define NG_ATMLLC_HEADER "\252\252\3\0\200\302"
46 #define NG_ATMLLC_HEADER_LEN (sizeof(struct atmllc))
47 #define NG_ATMLLC_TYPE_ETHERNET_FCS 0x0001
48 #define NG_ATMLLC_TYPE_FDDI_FCS 0x0004
49 #define NG_ATMLLC_TYPE_ETHERNET_NOFCS 0x0007
50 #define NG_ATMLLC_TYPE_FDDI_NOFCS 0x000A
51
52 struct ng_atmllc_priv {
53 hook_p atm;
54 hook_p ether;
55 hook_p fddi;
56 };
57
58 /* Netgraph methods. */
59 static ng_constructor_t ng_atmllc_constructor;
60 static ng_shutdown_t ng_atmllc_shutdown;
61 static ng_rcvmsg_t ng_atmllc_rcvmsg;
62 static ng_newhook_t ng_atmllc_newhook;
63 static ng_rcvdata_t ng_atmllc_rcvdata;
64 static ng_disconnect_t ng_atmllc_disconnect;
65
66 static struct ng_type ng_atmllc_typestruct = {
67 .version = NG_ABI_VERSION,
68 .name = NG_ATMLLC_NODE_TYPE,
69 .constructor = ng_atmllc_constructor,
70 .rcvmsg = ng_atmllc_rcvmsg,
71 .shutdown = ng_atmllc_shutdown,
72 .newhook = ng_atmllc_newhook,
73 .rcvdata = ng_atmllc_rcvdata,
74 .disconnect = ng_atmllc_disconnect,
75 };
76 NETGRAPH_INIT(atmllc, &ng_atmllc_typestruct);
77
78 static int
79 ng_atmllc_constructor(node_p node)
80 {
81 struct ng_atmllc_priv *priv;
82
83 priv = malloc(sizeof(*priv), M_NETGRAPH,
84 M_NOWAIT | M_ZERO);
85 if (priv == NULL) {
86 return (ENOMEM);
87 }
88
89 NG_NODE_SET_PRIVATE(node, priv);
90
91 return (0);
92 }
93
94 static int
95 ng_atmllc_rcvmsg(node_p node, item_p item, hook_p lasthook)
96 {
97 struct ng_mesg *msg;
98 int error;
99
100 error = 0;
101 NGI_GET_MSG(item, msg);
102 msg->header.flags |= NGF_RESP;
103 NG_RESPOND_MSG(error, node, item, msg);
104 return (error);
105 }
106
107 static int
108 ng_atmllc_shutdown(node_p node)
109 {
110 struct ng_atmllc_priv *priv;
111
112 priv = NG_NODE_PRIVATE(node);
113
114 free(priv, M_NETGRAPH);
115
116 NG_NODE_UNREF(node);
117
118 return (0);
119 }
120
121 static int
122 ng_atmllc_newhook(node_p node, hook_p hook, const char *name)
123 {
124 struct ng_atmllc_priv *priv;
125
126 priv = NG_NODE_PRIVATE(node);
127
128 if (strcmp(name, NG_ATMLLC_HOOK_ATM) == 0) {
129 if (priv->atm != NULL) {
130 return (EISCONN);
131 }
132 priv->atm = hook;
133 } else if (strcmp(name, NG_ATMLLC_HOOK_ETHER) == 0) {
134 if (priv->ether != NULL) {
135 return (EISCONN);
136 }
137 priv->ether = hook;
138 } else if (strcmp(name, NG_ATMLLC_HOOK_FDDI) == 0) {
139 if (priv->fddi != NULL) {
140 return (EISCONN);
141 }
142 priv->fddi = hook;
143 } else {
144 return (EINVAL);
145 }
146
147 return (0);
148 }
149
150 static int
151 ng_atmllc_rcvdata(hook_p hook, item_p item)
152 {
153 struct ng_atmllc_priv *priv;
154 struct mbuf *m;
155 struct atmllc *hdr;
156 hook_p outhook;
157 u_int padding;
158 int error;
159
160 priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
161 m = NGI_M(item);
162 outhook = NULL;
163 padding = 0;
164
165 if (hook == priv->atm) {
166 /* Ditch the psuedoheader. */
167 hdr = mtod(m, struct atmllc *);
168 /* m_adj(m, sizeof(struct atm_pseudohdr)); */
169
170 /*
171 * Make sure we have the LLC and ethernet headers.
172 * The ethernet header size is slightly larger than the FDDI
173 * header, which is convenient.
174 */
175 if (m->m_len < sizeof(struct atmllc) + ETHER_HDR_LEN) {
176 m = m_pullup(m, sizeof(struct atmllc) + ETHER_HDR_LEN);
177 if (m == NULL) {
178 return (ENOMEM);
179 }
180 }
181
182 /* Decode the LLC header. */
183 hdr = mtod(m, struct atmllc *);
184 if (ATM_LLC_TYPE(hdr) == NG_ATMLLC_TYPE_ETHERNET_NOFCS) {
185 m->m_flags &= ~M_HASFCS;
186 outhook = priv->ether;
187 padding = 2;
188 } else if (ATM_LLC_TYPE(hdr) == NG_ATMLLC_TYPE_ETHERNET_FCS) {
189 m->m_flags |= M_HASFCS;
190 outhook = priv->ether;
191 padding = 2;
192 } else if (ATM_LLC_TYPE(hdr) == NG_ATMLLC_TYPE_FDDI_NOFCS) {
193 m->m_flags &= ~M_HASFCS;
194 outhook = priv->fddi;
195 padding = 3;
196 } else if (ATM_LLC_TYPE(hdr) == NG_ATMLLC_TYPE_FDDI_FCS) {
197 m->m_flags |= M_HASFCS;
198 outhook = priv->fddi;
199 padding = 3;
200 } else {
201 printf("ng_atmllc: unknown type: %x\n",
202 ATM_LLC_TYPE(hdr));
203 }
204
205 /* Remove the LLC header and any padding*/
206 m_adj(m, sizeof(struct atmllc) + padding);
207 } else if (hook == priv->ether) {
208 /* Add the LLC header */
209 M_PREPEND(m, NG_ATMLLC_HEADER_LEN + 2, M_DONTWAIT);
210 if (m == NULL) {
211 printf("ng_atmllc: M_PREPEND failed\n");
212 NG_FREE_ITEM(item);
213 return (ENOMEM);
214 }
215 hdr = mtod(m, struct atmllc *);
216 bzero((void *)hdr, sizeof(struct atmllc) + 2);
217 bcopy(NG_ATMLLC_HEADER, hdr->llchdr, 6);
218 if ((m->m_flags & M_HASFCS) != 0) {
219 ATM_LLC_SETTYPE(hdr, NG_ATMLLC_TYPE_ETHERNET_FCS);
220 } else {
221 ATM_LLC_SETTYPE(hdr, NG_ATMLLC_TYPE_ETHERNET_NOFCS);
222 }
223 outhook = priv->atm;
224 } else if (hook == priv->fddi) {
225 /* Add the LLC header */
226 M_PREPEND(m, NG_ATMLLC_HEADER_LEN + 3, M_DONTWAIT);
227 if (m == NULL) {
228 printf("ng_atmllc: M_PREPEND failed\n");
229 NG_FREE_ITEM(item);
230 return (ENOMEM);
231 }
232 hdr = mtod(m, struct atmllc *);
233 bzero((void *)hdr, sizeof(struct atmllc) + 3);
234 bcopy(NG_ATMLLC_HEADER, hdr->llchdr, 6);
235 if ((m->m_flags & M_HASFCS) != 0) {
236 ATM_LLC_SETTYPE(hdr, NG_ATMLLC_TYPE_FDDI_FCS);
237 } else {
238 ATM_LLC_SETTYPE(hdr, NG_ATMLLC_TYPE_FDDI_NOFCS);
239 }
240 outhook = priv->atm;
241 }
242
243 if (outhook == NULL) {
244 NG_FREE_ITEM(item);
245 return (0);
246 }
247
248 NG_FWD_NEW_DATA(error, item, outhook, m);
249 return (error);
250 }
251
252 static int
253 ng_atmllc_disconnect(hook_p hook)
254 {
255 node_p node;
256 struct ng_atmllc_priv *priv;
257
258 node = NG_HOOK_NODE(hook);
259 priv = NG_NODE_PRIVATE(node);
260
261 if (hook == priv->atm) {
262 priv->atm = NULL;
263 } else if (hook == priv->ether) {
264 priv->ether = NULL;
265 } else if (hook == priv->fddi) {
266 priv->fddi = NULL;
267 }
268
269 if (NG_NODE_NUMHOOKS(node) == 0 && NG_NODE_IS_VALID(node)) {
270 ng_rmnode_self(node);
271 }
272
273 return (0);
274 }
275
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