if_atmsubr.c revision 54263 
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: head/sys/net/if_atmsubr.c 54263 1999-12-07 17:39:16Z shin $
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/malloc.h>
51#include <sys/errno.h>
52
53#include <net/if.h>
54#include <net/netisr.h>
55#include <net/route.h>
56#include <net/if_dl.h>
57#include <net/if_types.h>
58#include <net/if_atm.h>
59
60#include <netinet/in.h>
61#include <netinet/if_atm.h>
62#include <netinet/if_ether.h> /* XXX: for ETHERTYPE_* */
63#if defined(INET) || defined(INET6)
64#include <netinet/in_var.h>
65#endif
66#ifdef NATM
67#include <netnatm/natm.h>
68#endif
69
70#ifndef ETHERTYPE_IPV6
71#define ETHERTYPE_IPV6	0x86dd
72#endif
73
74#define senderr(e) { error = (e); goto bad;}
75
76/*
77 * atm_output: ATM output routine
78 *   inputs:
79 *     "ifp" = ATM interface to output to
80 *     "m0" = the packet to output
81 *     "dst" = the sockaddr to send to (either IP addr, or raw VPI/VCI)
82 *     "rt0" = the route to use
83 *   returns: error code   [0 == ok]
84 *
85 *   note: special semantic: if (dst == NULL) then we assume "m" already
86 *		has an atm_pseudohdr on it and just send it directly.
87 *		[for native mode ATM output]   if dst is null, then
88 *		rt0 must also be NULL.
89 */
90
91int
92atm_output(ifp, m0, dst, rt0)
93	register struct ifnet *ifp;
94	struct mbuf *m0;
95	struct sockaddr *dst;
96	struct rtentry *rt0;
97{
98	u_int16_t etype = 0;			/* if using LLC/SNAP */
99	int s, error = 0, sz;
100	struct atm_pseudohdr atmdst, *ad;
101	register struct mbuf *m = m0;
102	register struct rtentry *rt;
103	struct atmllc *atmllc;
104	struct atmllc *llc_hdr = NULL;
105	u_int32_t atm_flags;
106
107	if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING))
108		senderr(ENETDOWN);
109
110	/*
111	 * check route
112	 */
113	if ((rt = rt0) != NULL) {
114
115		if ((rt->rt_flags & RTF_UP) == 0) { /* route went down! */
116			if ((rt0 = rt = RTALLOC1(dst, 0)) != NULL)
117				rt->rt_refcnt--;
118			else
119				senderr(EHOSTUNREACH);
120		}
121
122		if (rt->rt_flags & RTF_GATEWAY) {
123			if (rt->rt_gwroute == 0)
124				goto lookup;
125			if (((rt = rt->rt_gwroute)->rt_flags & RTF_UP) == 0) {
126				rtfree(rt); rt = rt0;
127			lookup: rt->rt_gwroute = RTALLOC1(rt->rt_gateway, 0);
128				if ((rt = rt->rt_gwroute) == 0)
129					senderr(EHOSTUNREACH);
130			}
131		}
132
133		/* XXX: put RTF_REJECT code here if doing ATMARP */
134
135	}
136
137	/*
138	 * check for non-native ATM traffic   (dst != NULL)
139	 */
140	if (dst) {
141		switch (dst->sa_family) {
142#if defined(INET) || defined(INET6)
143		case AF_INET:
144		case AF_INET6:
145			if (dst->sa_family == AF_INET6)
146			        etype = htons(ETHERTYPE_IPV6);
147			else
148			        etype = htons(ETHERTYPE_IP);
149			if (!atmresolve(rt, m, dst, &atmdst)) {
150				m = NULL;
151				/* XXX: atmresolve already free'd it */
152				senderr(EHOSTUNREACH);
153				/* XXX: put ATMARP stuff here */
154				/* XXX: watch who frees m on failure */
155			}
156			break;
157#endif /* INET || INET6 */
158
159		case AF_UNSPEC:
160			/*
161			 * XXX: bpfwrite. assuming dst contains 12 bytes
162			 * (atm pseudo header (4) + LLC/SNAP (8))
163			 */
164			bcopy(dst->sa_data, &atmdst, sizeof(atmdst));
165			llc_hdr = (struct atmllc *)(dst->sa_data + sizeof(atmdst));
166			break;
167
168		default:
169#if defined(__NetBSD__) || defined(__OpenBSD__)
170			printf("%s: can't handle af%d\n", ifp->if_xname,
171			    dst->sa_family);
172#elif defined(__FreeBSD__) || defined(__bsdi__)
173			printf("%s%d: can't handle af%d\n", ifp->if_name,
174			    ifp->if_unit, dst->sa_family);
175#endif
176			senderr(EAFNOSUPPORT);
177		}
178
179		/*
180		 * must add atm_pseudohdr to data
181		 */
182		sz = sizeof(atmdst);
183		atm_flags = ATM_PH_FLAGS(&atmdst);
184		if (atm_flags & ATM_PH_LLCSNAP) sz += 8; /* sizeof snap == 8 */
185		M_PREPEND(m, sz, M_DONTWAIT);
186		if (m == 0)
187			senderr(ENOBUFS);
188		ad = mtod(m, struct atm_pseudohdr *);
189		*ad = atmdst;
190		if (atm_flags & ATM_PH_LLCSNAP) {
191			atmllc = (struct atmllc *)(ad + 1);
192			if (llc_hdr == NULL) {
193			        bcopy(ATMLLC_HDR, atmllc->llchdr,
194				      sizeof(atmllc->llchdr));
195				ATM_LLC_SETTYPE(atmllc, etype);
196					/* note: already in network order */
197			}
198			else
199			        bcopy(llc_hdr, atmllc, sizeof(struct atmllc));
200		}
201	}
202
203	/*
204	 * Queue message on interface, and start output if interface
205	 * not yet active.
206	 */
207	s = splimp();
208	if (IF_QFULL(&ifp->if_snd)) {
209		IF_DROP(&ifp->if_snd);
210		splx(s);
211		senderr(ENOBUFS);
212	}
213	ifp->if_obytes += m->m_pkthdr.len;
214	IF_ENQUEUE(&ifp->if_snd, m);
215	if ((ifp->if_flags & IFF_OACTIVE) == 0)
216		(*ifp->if_start)(ifp);
217	splx(s);
218	return (error);
219
220bad:
221	if (m)
222		m_freem(m);
223	return (error);
224}
225
226/*
227 * Process a received ATM packet;
228 * the packet is in the mbuf chain m.
229 */
230void
231atm_input(ifp, ah, m, rxhand)
232	struct ifnet *ifp;
233	register struct atm_pseudohdr *ah;
234	struct mbuf *m;
235	void *rxhand;
236{
237	register struct ifqueue *inq;
238	u_int16_t etype = ETHERTYPE_IP; /* default */
239	int s;
240
241	if ((ifp->if_flags & IFF_UP) == 0) {
242		m_freem(m);
243		return;
244	}
245	ifp->if_ibytes += m->m_pkthdr.len;
246
247	if (rxhand) {
248#ifdef NATM
249		struct natmpcb *npcb = rxhand;
250		s = splimp();		/* in case 2 atm cards @ diff lvls */
251		npcb->npcb_inq++;	/* count # in queue */
252		splx(s);
253		schednetisr(NETISR_NATM);
254		inq = &natmintrq;
255		m->m_pkthdr.rcvif = rxhand; /* XXX: overload */
256#else
257		printf("atm_input: NATM detected but not configured in kernel\n");
258		m_freem(m);
259		return;
260#endif
261	} else {
262		/*
263		 * handle LLC/SNAP header, if present
264		 */
265		if (ATM_PH_FLAGS(ah) & ATM_PH_LLCSNAP) {
266			struct atmllc *alc;
267			if (m->m_len < sizeof(*alc) &&
268			    (m = m_pullup(m, sizeof(*alc))) == 0)
269				return; /* failed */
270			alc = mtod(m, struct atmllc *);
271			if (bcmp(alc, ATMLLC_HDR, 6)) {
272#if defined(__NetBSD__) || defined(__OpenBSD__)
273				printf("%s: recv'd invalid LLC/SNAP frame [vp=%d,vc=%d]\n",
274				       ifp->if_xname, ATM_PH_VPI(ah), ATM_PH_VCI(ah));
275#elif defined(__FreeBSD__) || defined(__bsdi__)
276				printf("%s%d: recv'd invalid LLC/SNAP frame [vp=%d,vc=%d]\n",
277				       ifp->if_name, ifp->if_unit, ATM_PH_VPI(ah), ATM_PH_VCI(ah));
278#endif
279				m_freem(m);
280				return;
281			}
282			etype = ATM_LLC_TYPE(alc);
283			m_adj(m, sizeof(*alc));
284		}
285
286		switch (etype) {
287#ifdef INET
288		case ETHERTYPE_IP:
289			schednetisr(NETISR_IP);
290			inq = &ipintrq;
291			break;
292#endif
293#ifdef INET6
294		case ETHERTYPE_IPV6:
295			schednetisr(NETISR_IPV6);
296			inq = &ip6intrq;
297			break;
298#endif
299		default:
300			m_freem(m);
301			return;
302		}
303	}
304
305	s = splimp();
306	if (IF_QFULL(inq)) {
307		IF_DROP(inq);
308		m_freem(m);
309	} else
310		IF_ENQUEUE(inq, m);
311	splx(s);
312}
313
314/*
315 * Perform common duties while attaching to interface list
316 */
317void
318atm_ifattach(ifp)
319	register struct ifnet *ifp;
320{
321	register struct ifaddr *ifa;
322	register struct sockaddr_dl *sdl;
323
324	ifp->if_type = IFT_ATM;
325	ifp->if_addrlen = 0;
326	ifp->if_hdrlen = 0;
327	ifp->if_mtu = ATMMTU;
328	ifp->if_output = atm_output;
329	ifp->if_snd.ifq_maxlen = 50;	/* dummy */
330
331#if defined(__NetBSD__) || defined(__OpenBSD__)
332	for (ifa = ifp->if_addrlist.tqh_first; ifa != 0;
333	    ifa = ifa->ifa_list.tqe_next)
334#elif defined(__FreeBSD__) && (__FreeBSD__ > 2)
335	for (ifa = ifp->if_addrhead.tqh_first; ifa;
336	    ifa = ifa->ifa_link.tqe_next)
337#elif defined(__FreeBSD__) || defined(__bsdi__)
338	for (ifa = ifp->if_addrlist; ifa; ifa = ifa->ifa_next)
339#endif
340		if ((sdl = (struct sockaddr_dl *)ifa->ifa_addr) &&
341		    sdl->sdl_family == AF_LINK) {
342			sdl->sdl_type = IFT_ATM;
343			sdl->sdl_alen = ifp->if_addrlen;
344#ifdef notyet /* if using ATMARP, store hardware address using the next line */
345			bcopy(ifp->hw_addr, LLADDR(sdl), ifp->if_addrlen);
346#endif
347			break;
348		}
349
350}
351