if_atmsubr.c revision 59633 
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 59633 2000-04-26 02:40:33Z kjc $
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
90int
91atm_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
219bad:
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 */
229void
230atm_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 */
316void
317atm_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 = ifp->if_addrlist.tqh_first; ifa != 0;
332	    ifa = ifa->ifa_list.tqe_next)
333#elif defined(__FreeBSD__) && (__FreeBSD__ > 2)
334	for (ifa = ifp->if_addrhead.tqh_first; ifa;
335	    ifa = ifa->ifa_link.tqe_next)
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}
350