FreeBSD/Linux Kernel Cross Reference
sys/net/if_atmsubr.c
1 /* $NetBSD: if_atmsubr.c,v 1.10 1997/03/11 23:19:51 chuck 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 * $FreeBSD$
35 */
36
37 /*
38 * if_atmsubr.c
39 */
40
41 #include "opt_inet.h"
42 #include "opt_inet6.h"
43 #include "opt_natm.h"
44
45 #include <sys/param.h>
46 #include <sys/systm.h>
47 #include <sys/mbuf.h>
48 #include <sys/socket.h>
49 #include <sys/sockio.h>
50 #include <sys/errno.h>
51
52 #include <net/if.h>
53 #include <net/netisr.h>
54 #include <net/route.h>
55 #include <net/if_dl.h>
56 #include <net/if_types.h>
57 #include <net/if_atm.h>
58
59 #include <netinet/in.h>
60 #include <netinet/if_atm.h>
61 #include <netinet/if_ether.h> /* XXX: for ETHERTYPE_* */
62 #if defined(INET) || defined(INET6)
63 #include <netinet/in_var.h>
64 #endif
65 #ifdef NATM
66 #include <netnatm/natm.h>
67 #endif
68
69 #ifndef ETHERTYPE_IPV6
70 #define ETHERTYPE_IPV6 0x86dd
71 #endif
72
73 #define senderr(e) { error = (e); goto bad;}
74
75 /*
76 * atm_output: ATM output routine
77 * inputs:
78 * "ifp" = ATM interface to output to
79 * "m0" = the packet to output
80 * "dst" = the sockaddr to send to (either IP addr, or raw VPI/VCI)
81 * "rt0" = the route to use
82 * returns: error code [0 == ok]
83 *
84 * note: special semantic: if (dst == NULL) then we assume "m" already
85 * has an atm_pseudohdr on it and just send it directly.
86 * [for native mode ATM output] if dst is null, then
87 * rt0 must also be NULL.
88 */
89
90 int
91 atm_output(ifp, m0, dst, rt0)
92 register struct ifnet *ifp;
93 struct mbuf *m0;
94 struct sockaddr *dst;
95 struct rtentry *rt0;
96 {
97 u_int16_t etype = 0; /* if using LLC/SNAP */
98 int s, error = 0, sz;
99 struct atm_pseudohdr atmdst, *ad;
100 struct mbuf *m = m0;
101 struct rtentry *rt;
102 struct atmllc *atmllc;
103 struct atmllc *llc_hdr = NULL;
104 u_int32_t atm_flags;
105
106 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING))
107 senderr(ENETDOWN);
108
109 /*
110 * check route
111 */
112 if ((rt = rt0) != NULL) {
113
114 if ((rt->rt_flags & RTF_UP) == 0) { /* route went down! */
115 if ((rt0 = rt = RTALLOC1(dst, 0)) != NULL)
116 rt->rt_refcnt--;
117 else
118 senderr(EHOSTUNREACH);
119 }
120
121 if (rt->rt_flags & RTF_GATEWAY) {
122 if (rt->rt_gwroute == 0)
123 goto lookup;
124 if (((rt = rt->rt_gwroute)->rt_flags & RTF_UP) == 0) {
125 rtfree(rt); rt = rt0;
126 lookup: rt->rt_gwroute = RTALLOC1(rt->rt_gateway, 0);
127 if ((rt = rt->rt_gwroute) == 0)
128 senderr(EHOSTUNREACH);
129 }
130 }
131
132 /* XXX: put RTF_REJECT code here if doing ATMARP */
133
134 }
135
136 /*
137 * check for non-native ATM traffic (dst != NULL)
138 */
139 if (dst) {
140 switch (dst->sa_family) {
141 #if defined(INET) || defined(INET6)
142 case AF_INET:
143 case AF_INET6:
144 if (dst->sa_family == AF_INET6)
145 etype = htons(ETHERTYPE_IPV6);
146 else
147 etype = htons(ETHERTYPE_IP);
148 if (!atmresolve(rt, m, dst, &atmdst)) {
149 m = NULL;
150 /* XXX: atmresolve already free'd it */
151 senderr(EHOSTUNREACH);
152 /* XXX: put ATMARP stuff here */
153 /* XXX: watch who frees m on failure */
154 }
155 break;
156 #endif /* INET || INET6 */
157
158 case AF_UNSPEC:
159 /*
160 * XXX: bpfwrite. assuming dst contains 12 bytes
161 * (atm pseudo header (4) + LLC/SNAP (8))
162 */
163 bcopy(dst->sa_data, &atmdst, sizeof(atmdst));
164 llc_hdr = (struct atmllc *)(dst->sa_data + sizeof(atmdst));
165 break;
166
167 default:
168 #if defined(__NetBSD__) || defined(__OpenBSD__)
169 printf("%s: can't handle af%d\n", ifp->if_xname,
170 dst->sa_family);
171 #elif defined(__FreeBSD__) || defined(__bsdi__)
172 printf("%s%d: can't handle af%d\n", ifp->if_name,
173 ifp->if_unit, dst->sa_family);
174 #endif
175 senderr(EAFNOSUPPORT);
176 }
177
178 /*
179 * must add atm_pseudohdr to data
180 */
181 sz = sizeof(atmdst);
182 atm_flags = ATM_PH_FLAGS(&atmdst);
183 if (atm_flags & ATM_PH_LLCSNAP) sz += 8; /* sizeof snap == 8 */
184 M_PREPEND(m, sz, M_DONTWAIT);
185 if (m == 0)
186 senderr(ENOBUFS);
187 ad = mtod(m, struct atm_pseudohdr *);
188 *ad = atmdst;
189 if (atm_flags & ATM_PH_LLCSNAP) {
190 atmllc = (struct atmllc *)(ad + 1);
191 if (llc_hdr == NULL) {
192 bcopy(ATMLLC_HDR, atmllc->llchdr,
193 sizeof(atmllc->llchdr));
194 ATM_LLC_SETTYPE(atmllc, etype);
195 /* note: already in network order */
196 }
197 else
198 bcopy(llc_hdr, atmllc, sizeof(struct atmllc));
199 }
200 }
201
202 /*
203 * Queue message on interface, and start output if interface
204 * not yet active.
205 */
206 s = splimp();
207 if (IF_QFULL(&ifp->if_snd)) {
208 IF_DROP(&ifp->if_snd);
209 splx(s);
210 senderr(ENOBUFS);
211 }
212 ifp->if_obytes += m->m_pkthdr.len;
213 IF_ENQUEUE(&ifp->if_snd, m);
214 if ((ifp->if_flags & IFF_OACTIVE) == 0)
215 (*ifp->if_start)(ifp);
216 splx(s);
217 return (error);
218
219 bad:
220 if (m)
221 m_freem(m);
222 return (error);
223 }
224
225 /*
226 * Process a received ATM packet;
227 * the packet is in the mbuf chain m.
228 */
229 void
230 atm_input(ifp, ah, m, rxhand)
231 struct ifnet *ifp;
232 register struct atm_pseudohdr *ah;
233 struct mbuf *m;
234 void *rxhand;
235 {
236 register struct ifqueue *inq;
237 u_int16_t etype = ETHERTYPE_IP; /* default */
238 int s;
239
240 if ((ifp->if_flags & IFF_UP) == 0) {
241 m_freem(m);
242 return;
243 }
244 ifp->if_ibytes += m->m_pkthdr.len;
245
246 if (rxhand) {
247 #ifdef NATM
248 struct natmpcb *npcb = rxhand;
249 s = splimp(); /* in case 2 atm cards @ diff lvls */
250 npcb->npcb_inq++; /* count # in queue */
251 splx(s);
252 schednetisr(NETISR_NATM);
253 inq = &natmintrq;
254 m->m_pkthdr.rcvif = rxhand; /* XXX: overload */
255 #else
256 printf("atm_input: NATM detected but not configured in kernel\n");
257 m_freem(m);
258 return;
259 #endif
260 } else {
261 /*
262 * handle LLC/SNAP header, if present
263 */
264 if (ATM_PH_FLAGS(ah) & ATM_PH_LLCSNAP) {
265 struct atmllc *alc;
266 if (m->m_len < sizeof(*alc) &&
267 (m = m_pullup(m, sizeof(*alc))) == 0)
268 return; /* failed */
269 alc = mtod(m, struct atmllc *);
270 if (bcmp(alc, ATMLLC_HDR, 6)) {
271 #if defined(__NetBSD__) || defined(__OpenBSD__)
272 printf("%s: recv'd invalid LLC/SNAP frame [vp=%d,vc=%d]\n",
273 ifp->if_xname, ATM_PH_VPI(ah), ATM_PH_VCI(ah));
274 #elif defined(__FreeBSD__) || defined(__bsdi__)
275 printf("%s%d: recv'd invalid LLC/SNAP frame [vp=%d,vc=%d]\n",
276 ifp->if_name, ifp->if_unit, ATM_PH_VPI(ah), ATM_PH_VCI(ah));
277 #endif
278 m_freem(m);
279 return;
280 }
281 etype = ATM_LLC_TYPE(alc);
282 m_adj(m, sizeof(*alc));
283 }
284
285 switch (etype) {
286 #ifdef INET
287 case ETHERTYPE_IP:
288 schednetisr(NETISR_IP);
289 inq = &ipintrq;
290 break;
291 #endif
292 #ifdef INET6
293 case ETHERTYPE_IPV6:
294 schednetisr(NETISR_IPV6);
295 inq = &ip6intrq;
296 break;
297 #endif
298 default:
299 m_freem(m);
300 return;
301 }
302 }
303
304 s = splimp();
305 if (IF_QFULL(inq)) {
306 IF_DROP(inq);
307 m_freem(m);
308 } else
309 IF_ENQUEUE(inq, m);
310 splx(s);
311 }
312
313 /*
314 * Perform common duties while attaching to interface list
315 */
316 void
317 atm_ifattach(ifp)
318 register struct ifnet *ifp;
319 {
320 register struct ifaddr *ifa;
321 register struct sockaddr_dl *sdl;
322
323 ifp->if_type = IFT_ATM;
324 ifp->if_addrlen = 0;
325 ifp->if_hdrlen = 0;
326 ifp->if_mtu = ATMMTU;
327 ifp->if_output = atm_output;
328 ifp->if_snd.ifq_maxlen = 50; /* dummy */
329
330 #if defined(__NetBSD__) || defined(__OpenBSD__)
331 for (ifa = TAILQ_FIRST(&ifp->if_addrlist); ifa != 0;
332 ifa = TAILQ_NEXT(ifa, ifa_list))
333 #elif defined(__FreeBSD__) && (__FreeBSD__ > 2)
334 for (ifa = TAILQ_FIRST(&ifp->if_addrhead); ifa;
335 ifa = TAILQ_NEXT(ifa, ifa_link))
336 #elif defined(__FreeBSD__) || defined(__bsdi__)
337 for (ifa = ifp->if_addrlist; ifa; ifa = ifa->ifa_next)
338 #endif
339 if ((sdl = (struct sockaddr_dl *)ifa->ifa_addr) &&
340 sdl->sdl_family == AF_LINK) {
341 sdl->sdl_type = IFT_ATM;
342 sdl->sdl_alen = ifp->if_addrlen;
343 #ifdef notyet /* if using ATMARP, store hardware address using the next line */
344 bcopy(ifp->hw_addr, LLADDR(sdl), ifp->if_addrlen);
345 #endif
346 break;
347 }
348
349 }
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