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: releng/5.0/sys/net/if_atmsubr.c 106939 2002-11-15 00:00:15Z sam $
35 */
36
37 /*
38 * if_atmsubr.c
39 */
40
41 #include "opt_inet.h"
42 #include "opt_inet6.h"
43 #include "opt_mac.h"
44 #include "opt_natm.h"
45
46 #include <sys/param.h>
47 #include <sys/systm.h>
48 #include <sys/mac.h>
49 #include <sys/mbuf.h>
50 #include <sys/socket.h>
51 #include <sys/sockio.h>
52 #include <sys/errno.h>
53
54 #include <net/if.h>
55 #include <net/netisr.h>
56 #include <net/route.h>
57 #include <net/if_dl.h>
58 #include <net/if_types.h>
59 #include <net/if_atm.h>
60
61 #include <netinet/in.h>
62 #include <netinet/if_atm.h>
63 #include <netinet/if_ether.h> /* XXX: for ETHERTYPE_* */
64 #if defined(INET) || defined(INET6)
65 #include <netinet/in_var.h>
66 #endif
67 #ifdef NATM
68 #include <netnatm/natm.h>
69 #endif
70
71 #ifndef ETHERTYPE_IPV6
72 #define ETHERTYPE_IPV6 0x86dd
73 #endif
74
75 #define senderr(e) { error = (e); goto bad;}
76
77 /*
78 * atm_output: ATM output routine
79 * inputs:
80 * "ifp" = ATM interface to output to
81 * "m0" = the packet to output
82 * "dst" = the sockaddr to send to (either IP addr, or raw VPI/VCI)
83 * "rt0" = the route to use
84 * returns: error code [0 == ok]
85 *
86 * note: special semantic: if (dst == NULL) then we assume "m" already
87 * has an atm_pseudohdr on it and just send it directly.
88 * [for native mode ATM output] if dst is null, then
89 * rt0 must also be NULL.
90 */
91
92 int
93 atm_output(ifp, m0, dst, rt0)
94 register struct ifnet *ifp;
95 struct mbuf *m0;
96 struct sockaddr *dst;
97 struct rtentry *rt0;
98 {
99 u_int16_t etype = 0; /* if using LLC/SNAP */
100 int error = 0, sz;
101 struct atm_pseudohdr atmdst, *ad;
102 struct mbuf *m = m0;
103 struct rtentry *rt;
104 struct atmllc *atmllc;
105 struct atmllc *llc_hdr = NULL;
106 u_int32_t atm_flags;
107
108 #ifdef MAC
109 error = mac_check_ifnet_transmit(ifp, m);
110 if (error)
111 senderr(error);
112 #endif
113
114 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING))
115 senderr(ENETDOWN);
116
117 /*
118 * check route
119 */
120 if ((rt = rt0) != NULL) {
121
122 if ((rt->rt_flags & RTF_UP) == 0) { /* route went down! */
123 if ((rt0 = rt = RTALLOC1(dst, 0)) != NULL)
124 rt->rt_refcnt--;
125 else
126 senderr(EHOSTUNREACH);
127 }
128
129 if (rt->rt_flags & RTF_GATEWAY) {
130 if (rt->rt_gwroute == 0)
131 goto lookup;
132 if (((rt = rt->rt_gwroute)->rt_flags & RTF_UP) == 0) {
133 rtfree(rt); rt = rt0;
134 lookup: rt->rt_gwroute = RTALLOC1(rt->rt_gateway, 0);
135 if ((rt = rt->rt_gwroute) == 0)
136 senderr(EHOSTUNREACH);
137 }
138 }
139
140 /* XXX: put RTF_REJECT code here if doing ATMARP */
141
142 }
143
144 /*
145 * check for non-native ATM traffic (dst != NULL)
146 */
147 if (dst) {
148 switch (dst->sa_family) {
149 #if defined(INET) || defined(INET6)
150 case AF_INET:
151 case AF_INET6:
152 if (dst->sa_family == AF_INET6)
153 etype = htons(ETHERTYPE_IPV6);
154 else
155 etype = htons(ETHERTYPE_IP);
156 if (!atmresolve(rt, m, dst, &atmdst)) {
157 m = NULL;
158 /* XXX: atmresolve already free'd it */
159 senderr(EHOSTUNREACH);
160 /* XXX: put ATMARP stuff here */
161 /* XXX: watch who frees m on failure */
162 }
163 break;
164 #endif /* INET || INET6 */
165
166 case AF_UNSPEC:
167 /*
168 * XXX: bpfwrite. assuming dst contains 12 bytes
169 * (atm pseudo header (4) + LLC/SNAP (8))
170 */
171 bcopy(dst->sa_data, &atmdst, sizeof(atmdst));
172 llc_hdr = (struct atmllc *)(dst->sa_data + sizeof(atmdst));
173 break;
174
175 default:
176 #if defined(__NetBSD__) || defined(__OpenBSD__)
177 printf("%s: can't handle af%d\n", ifp->if_xname,
178 dst->sa_family);
179 #elif defined(__FreeBSD__) || defined(__bsdi__)
180 printf("%s%d: can't handle af%d\n", ifp->if_name,
181 ifp->if_unit, dst->sa_family);
182 #endif
183 senderr(EAFNOSUPPORT);
184 }
185
186 /*
187 * must add atm_pseudohdr to data
188 */
189 sz = sizeof(atmdst);
190 atm_flags = ATM_PH_FLAGS(&atmdst);
191 if (atm_flags & ATM_PH_LLCSNAP) sz += 8; /* sizeof snap == 8 */
192 M_PREPEND(m, sz, M_DONTWAIT);
193 if (m == 0)
194 senderr(ENOBUFS);
195 ad = mtod(m, struct atm_pseudohdr *);
196 *ad = atmdst;
197 if (atm_flags & ATM_PH_LLCSNAP) {
198 atmllc = (struct atmllc *)(ad + 1);
199 if (llc_hdr == NULL) {
200 bcopy(ATMLLC_HDR, atmllc->llchdr,
201 sizeof(atmllc->llchdr));
202 ATM_LLC_SETTYPE(atmllc, etype);
203 /* note: already in network order */
204 }
205 else
206 bcopy(llc_hdr, atmllc, sizeof(struct atmllc));
207 }
208 }
209
210 /*
211 * Queue message on interface, and start output if interface
212 * not yet active.
213 */
214 if (! IF_HANDOFF(&ifp->if_snd, m, ifp))
215 return (ENOBUFS);
216 return (error);
217
218 bad:
219 if (m)
220 m_freem(m);
221 return (error);
222 }
223
224 /*
225 * Process a received ATM packet;
226 * the packet is in the mbuf chain m.
227 */
228 void
229 atm_input(ifp, ah, m, rxhand)
230 struct ifnet *ifp;
231 register struct atm_pseudohdr *ah;
232 struct mbuf *m;
233 void *rxhand;
234 {
235 register struct ifqueue *inq;
236 u_int16_t etype = ETHERTYPE_IP; /* default */
237 int s;
238
239 if ((ifp->if_flags & IFF_UP) == 0) {
240 m_freem(m);
241 return;
242 }
243 #ifdef MAC
244 mac_create_mbuf_from_ifnet(ifp, m);
245 #endif
246 ifp->if_ibytes += m->m_pkthdr.len;
247
248 if (rxhand) {
249 #ifdef NATM
250 struct natmpcb *npcb = rxhand;
251 s = splimp(); /* in case 2 atm cards @ diff lvls */
252 npcb->npcb_inq++; /* count # in queue */
253 splx(s);
254 schednetisr(NETISR_NATM);
255 inq = &natmintrq;
256 m->m_pkthdr.rcvif = rxhand; /* XXX: overload */
257 #else
258 printf("atm_input: NATM detected but not configured in kernel\n");
259 m_freem(m);
260 return;
261 #endif
262 } else {
263 /*
264 * handle LLC/SNAP header, if present
265 */
266 if (ATM_PH_FLAGS(ah) & ATM_PH_LLCSNAP) {
267 struct atmllc *alc;
268 if (m->m_len < sizeof(*alc) &&
269 (m = m_pullup(m, sizeof(*alc))) == 0)
270 return; /* failed */
271 alc = mtod(m, struct atmllc *);
272 if (bcmp(alc, ATMLLC_HDR, 6)) {
273 #if defined(__NetBSD__) || defined(__OpenBSD__)
274 printf("%s: recv'd invalid LLC/SNAP frame [vp=%d,vc=%d]\n",
275 ifp->if_xname, ATM_PH_VPI(ah), ATM_PH_VCI(ah));
276 #elif defined(__FreeBSD__) || defined(__bsdi__)
277 printf("%s%d: recv'd invalid LLC/SNAP frame [vp=%d,vc=%d]\n",
278 ifp->if_name, ifp->if_unit, ATM_PH_VPI(ah), ATM_PH_VCI(ah));
279 #endif
280 m_freem(m);
281 return;
282 }
283 etype = ATM_LLC_TYPE(alc);
284 m_adj(m, sizeof(*alc));
285 }
286
287 switch (etype) {
288 #ifdef INET
289 case ETHERTYPE_IP:
290 schednetisr(NETISR_IP);
291 inq = &ipintrq;
292 break;
293 #endif
294 #ifdef INET6
295 case ETHERTYPE_IPV6:
296 schednetisr(NETISR_IPV6);
297 inq = &ip6intrq;
298 break;
299 #endif
300 default:
301 m_freem(m);
302 return;
303 }
304 }
305
306 (void) IF_HANDOFF(inq, m, NULL);
307 }
308
309 /*
310 * Perform common duties while attaching to interface list
311 */
312 void
313 atm_ifattach(ifp)
314 register struct ifnet *ifp;
315 {
316 register struct ifaddr *ifa;
317 register struct sockaddr_dl *sdl;
318
319 ifp->if_type = IFT_ATM;
320 ifp->if_addrlen = 0;
321 ifp->if_hdrlen = 0;
322 ifp->if_mtu = ATMMTU;
323 ifp->if_output = atm_output;
324 #if 0
325 ifp->if_input = atm_input;
326 #endif
327 ifp->if_snd.ifq_maxlen = 50; /* dummy */
328
329 #if defined(__NetBSD__) || defined(__OpenBSD__)
330 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list)
331 #elif defined(__FreeBSD__) && (__FreeBSD__ > 2)
332 for (ifa = TAILQ_FIRST(&ifp->if_addrhead); ifa;
333 ifa = TAILQ_NEXT(ifa, ifa_link))
334 #elif defined(__FreeBSD__) || defined(__bsdi__)
335 for (ifa = ifp->if_addrlist; ifa; ifa = ifa->ifa_next)
336 #endif
337 if ((sdl = (struct sockaddr_dl *)ifa->ifa_addr) &&
338 sdl->sdl_family == AF_LINK) {
339 sdl->sdl_type = IFT_ATM;
340 sdl->sdl_alen = ifp->if_addrlen;
341 #ifdef notyet /* if using ATMARP, store hardware address using the next line */
342 bcopy(ifp->hw_addr, LLADDR(sdl), ifp->if_addrlen);
343 #endif
344 break;
345 }
346
347 }
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