Annotation of sys/net/if_atmsubr.c, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: if_atmsubr.c,v 1.26 2006/03/04 22:40:15 brad Exp $ */
2:
3: /*
4: *
5: * Copyright (c) 1996 Charles D. Cranor and Washington University.
6: * All rights reserved.
7: *
8: * Redistribution and use in source and binary forms, with or without
9: * modification, are permitted provided that the following conditions
10: * are met:
11: * 1. Redistributions of source code must retain the above copyright
12: * notice, this list of conditions and the following disclaimer.
13: * 2. Redistributions in binary form must reproduce the above copyright
14: * notice, this list of conditions and the following disclaimer in the
15: * documentation and/or other materials provided with the distribution.
16: * 3. All advertising materials mentioning features or use of this software
17: * must display the following acknowledgement:
18: * This product includes software developed by Charles D. Cranor and
19: * Washington University.
20: * 4. The name of the author may not be used to endorse or promote products
21: * derived from this software without specific prior written permission.
22: *
23: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
24: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
25: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
26: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
27: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
28: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
29: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
30: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
31: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
32: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
33: */
34:
35: /*
36: * @(#)COPYRIGHT 1.1 (NRL) January 1995
37: *
38: * NRL grants permission for redistribution and use in source and binary
39: * forms, with or without modification, of the software and documentation
40: * created at NRL provided that the following conditions are met:
41: *
42: * 1. Redistributions of source code must retain the above copyright
43: * notice, this list of conditions and the following disclaimer.
44: * 2. Redistributions in binary form must reproduce the above copyright
45: * notice, this list of conditions and the following disclaimer in the
46: * documentation and/or other materials provided with the distribution.
47: * 3. All advertising materials mentioning features or use of this software
48: * must display the following acknowledgements:
49: * This product includes software developed by the University of
50: * California, Berkeley and its contributors.
51: * This product includes software developed at the Information
52: * Technology Division, US Naval Research Laboratory.
53: * 4. Neither the name of the NRL nor the names of its contributors
54: * may be used to endorse or promote products derived from this software
55: * without specific prior written permission.
56: *
57: * THE SOFTWARE PROVIDED BY NRL IS PROVIDED BY NRL AND CONTRIBUTORS ``AS
58: * IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
59: * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
60: * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL NRL OR
61: * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
62: * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
63: * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
64: * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
65: * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
66: * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
67: * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
68: *
69: * The views and conclusions contained in the software and documentation
70: * are those of the authors and should not be interpreted as representing
71: * official policies, either expressed or implied, of the US Naval
72: * Research Laboratory (NRL).
73: */
74:
75: /*
76: * if_atmsubr.c
77: */
78:
79: #include <sys/param.h>
80: #include <sys/systm.h>
81: #include <sys/kernel.h>
82: #include <sys/malloc.h>
83: #include <sys/mbuf.h>
84: #include <sys/protosw.h>
85: #include <sys/socket.h>
86: #include <sys/ioctl.h>
87: #include <sys/errno.h>
88: #include <sys/syslog.h>
89:
90: #include <machine/cpu.h>
91:
92: #include <net/if.h>
93: #include <net/netisr.h>
94: #include <net/route.h>
95: #include <net/if_dl.h>
96: #include <net/if_types.h>
97: #include <net/if_atm.h>
98:
99: #include <netinet/in.h>
100: #include <netinet/if_atm.h>
101: #include <netinet/if_ether.h> /* XXX: for ETHERTYPE_* */
102: #if defined(INET) || defined(INET6)
103: #include <netinet/in_var.h>
104: #endif
105: #ifdef NATM
106: #include <netnatm/natm.h>
107: #endif
108:
109: #ifdef INET6
110: #include <netinet6/in6_var.h>
111: #endif /* INET6 */
112:
113: #define senderr(e) { error = (e); goto bad;}
114:
115: /*
116: * atm_output: ATM output routine
117: * inputs:
118: * "ifp" = ATM interface to output to
119: * "m0" = the packet to output
120: * "dst" = the sockaddr to send to (either IP addr, or raw VPI/VCI)
121: * "rt0" = the route to use
122: * returns: error code [0 == ok]
123: *
124: * note: special semantic: if (dst == NULL) then we assume "m" already
125: * has an atm_pseudohdr on it and just send it directly.
126: * [for native mode ATM output] if dst is null, then
127: * rt0 must also be NULL.
128: */
129:
130: int
131: atm_output(ifp, m0, dst, rt0)
132: struct ifnet *ifp;
133: struct mbuf *m0;
134: struct sockaddr *dst;
135: struct rtentry *rt0;
136: {
137: u_int16_t etype = 0; /* if using LLC/SNAP */
138: int s, error = 0, sz, len;
139: struct atm_pseudohdr atmdst, *ad;
140: struct mbuf *m = m0;
141: struct rtentry *rt;
142: struct atmllc *atmllc;
143: u_int32_t atm_flags;
144:
145: if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING))
146: senderr(ENETDOWN);
147:
148: /*
149: * check route
150: */
151: if ((rt = rt0) != NULL) {
152:
153: if ((rt->rt_flags & RTF_UP) == 0) { /* route went down! */
154: if ((rt0 = rt = RTALLOC1(dst, 0)) != NULL)
155: rt->rt_refcnt--;
156: else
157: senderr(EHOSTUNREACH);
158: }
159:
160: if (rt->rt_flags & RTF_GATEWAY) {
161: if (rt->rt_gwroute == 0)
162: goto lookup;
163: if (((rt = rt->rt_gwroute)->rt_flags & RTF_UP) == 0) {
164: rtfree(rt); rt = rt0;
165: lookup: rt->rt_gwroute = RTALLOC1(rt->rt_gateway, 0);
166: if ((rt = rt->rt_gwroute) == 0)
167: senderr(EHOSTUNREACH);
168: }
169: }
170:
171: /* XXX: put RTF_REJECT code here if doing ATMARP */
172:
173: }
174:
175: /*
176: * check for non-native ATM traffic (dst != NULL)
177: */
178: if (dst) {
179: switch (dst->sa_family) {
180: #ifdef INET
181: case AF_INET:
182: #endif
183: #ifdef INET6
184: case AF_INET6:
185: #endif
186: #if defined(INET) || defined(INET6)
187: if (dst->sa_family == AF_INET)
188: etype = ETHERTYPE_IP;
189: else
190: etype = ETHERTYPE_IPV6;
191: if (!atmresolve(rt, m, dst, &atmdst)) {
192: m = NULL;
193: /* XXX: atmresolve already free'd it */
194: senderr(EHOSTUNREACH);
195: /* XXX: put ATMARP stuff here */
196: /* XXX: watch who frees m on failure */
197: }
198: break;
199: #endif
200:
201: default:
202: #if defined(__NetBSD__) || defined(__OpenBSD__)
203: printf("%s: can't handle af%d\n", ifp->if_xname,
204: dst->sa_family);
205: #elif defined(__FreeBSD__) || defined(__bsdi__)
206: printf("%s%d: can't handle af%d\n", ifp->if_name,
207: ifp->if_unit, dst->sa_family);
208: #endif
209: senderr(EAFNOSUPPORT);
210: }
211:
212: /*
213: * must add atm_pseudohdr to data
214: */
215: sz = sizeof(atmdst);
216: atm_flags = ATM_PH_FLAGS(&atmdst);
217: if (atm_flags & ATM_PH_LLCSNAP) sz += 8; /* sizeof snap == 8 */
218: M_PREPEND(m, sz, M_DONTWAIT);
219: if (m == 0)
220: senderr(ENOBUFS);
221: ad = mtod(m, struct atm_pseudohdr *);
222: *ad = atmdst;
223: if (atm_flags & ATM_PH_LLCSNAP) {
224: atmllc = (struct atmllc *)(ad + 1);
225: bcopy(ATMLLC_HDR, atmllc->llchdr,
226: sizeof(atmllc->llchdr));
227: ATM_LLC_SETTYPE(atmllc, etype);
228: }
229: }
230:
231: /*
232: * Queue message on interface, and start output if interface
233: * not yet active.
234: */
235: len = m->m_pkthdr.len;
236: s = splnet();
237: IFQ_ENQUEUE(&ifp->if_snd, m, NULL, error);
238: if (error) {
239: splx(s);
240: return (error);
241: }
242: ifp->if_obytes += len;
243: if ((ifp->if_flags & IFF_OACTIVE) == 0)
244: (*ifp->if_start)(ifp);
245: splx(s);
246: return (error);
247:
248: bad:
249: if (m)
250: m_freem(m);
251: return (error);
252: }
253:
254: /*
255: * Process a received ATM packet;
256: * the packet is in the mbuf chain m.
257: */
258: void
259: atm_input(ifp, ah, m, rxhand)
260: struct ifnet *ifp;
261: struct atm_pseudohdr *ah;
262: struct mbuf *m;
263: void *rxhand;
264: {
265: struct ifqueue *inq;
266: u_int16_t etype = ETHERTYPE_IP; /* default */
267: int s;
268:
269: if ((ifp->if_flags & IFF_UP) == 0) {
270: m_freem(m);
271: return;
272: }
273: ifp->if_ibytes += m->m_pkthdr.len;
274:
275: if (rxhand) {
276: #ifdef NATM
277: struct natmpcb *npcb = rxhand;
278: s = splnet(); /* in case 2 atm cards @ diff lvls */
279: npcb->npcb_inq++; /* count # in queue */
280: splx(s);
281: schednetisr(NETISR_NATM);
282: inq = &natmintrq;
283: m->m_pkthdr.rcvif = rxhand; /* XXX: overload */
284: #else
285: printf("atm_input: NATM detected but not configured in kernel\n");
286: m_freem(m);
287: return;
288: #endif
289: } else {
290: /*
291: * handle LLC/SNAP header, if present
292: */
293: if (ATM_PH_FLAGS(ah) & ATM_PH_LLCSNAP) {
294: struct atmllc *alc;
295: if (m->m_len < sizeof(*alc) &&
296: (m = m_pullup(m, sizeof(*alc))) == NULL)
297: return; /* failed */
298: alc = mtod(m, struct atmllc *);
299: if (bcmp(alc, ATMLLC_HDR, 6)) {
300: #if defined(__NetBSD__) || defined(__OpenBSD__)
301: printf("%s: recv'd invalid LLC/SNAP frame [vp=%d,vc=%d]\n",
302: ifp->if_xname, ATM_PH_VPI(ah), ATM_PH_VCI(ah));
303: #elif defined(__FreeBSD__) || defined(__bsdi__)
304: printf("%s%d: recv'd invalid LLC/SNAP frame [vp=%d,vc=%d]\n",
305: ifp->if_name, ifp->if_unit, ATM_PH_VPI(ah), ATM_PH_VCI(ah));
306: #endif
307: m_freem(m);
308: return;
309: }
310: etype = ATM_LLC_TYPE(alc);
311: m_adj(m, sizeof(*alc));
312: }
313:
314: switch (etype) {
315: #ifdef INET
316: case ETHERTYPE_IP:
317: schednetisr(NETISR_IP);
318: inq = &ipintrq;
319: break;
320: #endif /* INET */
321: #ifdef INET6
322: case ETHERTYPE_IPV6:
323: schednetisr(NETISR_IPV6);
324: inq = &ip6intrq;
325: break;
326: #endif
327: default:
328: m_freem(m);
329: return;
330: }
331: }
332:
333: s = splnet();
334: IF_INPUT_ENQUEUE(inq, m);
335: splx(s);
336: }
337:
338: /*
339: * Perform common duties while attaching to interface list
340: */
341: void
342: atm_ifattach(ifp)
343: struct ifnet *ifp;
344: {
345:
346: ifp->if_type = IFT_ATM;
347: ifp->if_addrlen = 0;
348: ifp->if_hdrlen = 0;
349: ifp->if_mtu = ATMMTU;
350: ifp->if_output = atm_output;
351:
352: if_alloc_sadl(ifp);
353: #ifdef notyet /* if using ATMARP, store hardware address using the next line */
354: bcopy(ifp->hw_addr, LLADDR(ifp->if_sadl), ifp->if_addrlen);
355: #endif
356: }
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