if_atmsubr.c revision 109623 
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 109623 2003-01-21 08:56:16Z alfred $
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
92int
93atm_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_NOWAIT);
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
218bad:
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 */
228void
229atm_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 */
312void
313atm_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}
348