2 * Copyright (c) 1998, Larry Lile
5 * For latest sources and information on this driver, please
6 * go to http://anarchy.stdio.com.
8 * Questions, comments or suggestions should be directed to
9 * Larry Lile <lile@stdio.com>.
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
14 * 1. Redistributions of source code must retain the above copyright
15 * notice unmodified, this list of conditions, and the following
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * $FreeBSD: src/sys/net/if_iso88025subr.c,v 1.7.2.7 2002/06/18 00:15:31 kbyanc Exp $
34 * $DragonFly: src/sys/net/Attic/if_iso88025subr.c,v 1.9 2004/07/23 07:16:30 joerg Exp $
40 * General ISO 802.5 (Token Ring) support routines
46 #include <sys/param.h>
47 #include <sys/systm.h>
48 #include <sys/kernel.h>
49 #include <sys/malloc.h>
51 #include <sys/socket.h>
52 #include <sys/sockio.h>
53 #include <sys/sysctl.h>
56 #include <net/netisr.h>
57 #include <net/route.h>
58 #include <net/if_llc.h>
59 #include <net/if_dl.h>
60 #include <net/if_types.h>
62 #include <net/if_arp.h>
64 #include <net/iso88025.h>
67 #include <netinet/in.h>
68 #include <netinet/in_var.h>
69 #include <netinet/if_ether.h>
74 #include <machine/clock.h>
75 #include <machine/md_var.h>
77 #include <bus/isa/i386/isa_device.h>
80 #include <vm/vm_param.h>
83 #include <sys/kernel.h>
84 #include <net/iso88025.h>
86 static int iso88025_output(struct ifnet *, struct mbuf *,
87 struct sockaddr *, struct rtentry *);
88 static void iso88025_input(struct ifnet *, struct mbuf *);
91 iso88025_ifattach(struct ifnet *ifp)
93 struct ifaddr *ifa = NULL;
94 struct sockaddr_dl *sdl;
96 ifp->if_input = iso88025_input;
97 ifp->if_output = iso88025_output;
99 ifp->if_type = IFT_ISO88025;
100 ifp->if_addrlen = ISO88025_ADDR_LEN;
101 ifp->if_hdrlen = ISO88025_HDR_LEN;
102 if (ifp->if_baudrate == 0)
103 ifp->if_baudrate = TR_16MBPS; /* 16Mbit should be a safe default */
104 if (ifp->if_mtu == 0)
105 ifp->if_mtu = ISO88025_DEFAULT_MTU;
107 ifa = ifnet_addrs[ifp->if_index - 1];
109 printf("iso88025_ifattach: no lladdr!\n");
112 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
113 sdl->sdl_type = IFT_ISO88025;
114 sdl->sdl_alen = ifp->if_addrlen;
115 bcopy(((struct arpcom *)ifp)->ac_enaddr, LLADDR(sdl), ifp->if_addrlen);
116 bpfattach(ifp, DLT_IEEE802, sizeof(struct iso88025_header));
120 iso88025_ioctl(struct ifnet *ifp, int command, caddr_t data)
122 struct ifaddr *ifa = (struct ifaddr *) data;
123 struct ifreq *ifr = (struct ifreq *) data;
128 ifp->if_flags |= IFF_UP;
130 switch (ifa->ifa_addr->sa_family) {
133 ifp->if_init(ifp->if_softc); /* before arpwhohas */
134 arp_ifinit(ifp, ifa);
138 ifp->if_init(ifp->if_softc);
147 sa = (struct sockaddr *) & ifr->ifr_data;
148 bcopy(((struct arpcom *)ifp->if_softc)->ac_enaddr,
149 (caddr_t) sa->sa_data, ISO88025_ADDR_LEN);
155 * Set the interface MTU.
157 if (ifr->ifr_mtu > ISO88025_MAX_MTU) {
160 ifp->if_mtu = ifr->ifr_mtu;
168 * ISO88025 encapsulation
171 iso88025_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst, struct rtentry *rt0)
173 struct iso88025_header *th;
174 struct iso88025_header gen_th;
175 struct iso88025_sockaddr_data *sd = (struct iso88025_sockaddr_data *)dst->sa_data;
177 struct sockaddr_dl *sdl = NULL;
178 int s, error = 0, rif_len = 0;
181 int len = m->m_pkthdr.len, loop_copy = 0;
182 struct arpcom *ac = (struct arpcom *)ifp;
184 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING))
188 if ((rt->rt_flags & RTF_UP) == 0) {
189 rt0 = rt = rtalloc1(dst, 1, 0UL);
193 senderr(EHOSTUNREACH);
195 if (rt->rt_flags & RTF_GATEWAY) {
196 if (rt->rt_gwroute == 0)
198 if (((rt = rt->rt_gwroute)->rt_flags & RTF_UP) == 0) {
199 rtfree(rt); rt = rt0;
200 lookup: rt->rt_gwroute = rtalloc1(rt->rt_gateway, 1,
202 if ((rt = rt->rt_gwroute) == 0)
203 senderr(EHOSTUNREACH);
206 if (rt->rt_flags & RTF_REJECT)
207 if (rt->rt_rmx.rmx_expire == 0 ||
208 time_second < rt->rt_rmx.rmx_expire)
209 senderr(rt == rt0 ? EHOSTDOWN : EHOSTUNREACH);
212 /* Calculate routing info length based on arp table entry */
213 if (rt && (sdl = (struct sockaddr_dl *)rt->rt_gateway))
214 if (SDL_ISO88025(sdl)->trld_rcf != NULL)
215 rif_len = TR_RCF_RIFLEN(SDL_ISO88025(sdl)->trld_rcf);
217 /* Generate a generic 802.5 header for the packet */
219 gen_th.fc = TR_LLC_FRAME;
220 memcpy(gen_th.iso88025_shost, ac->ac_enaddr, sizeof(ac->ac_enaddr));
222 gen_th.iso88025_shost[0] |= TR_RII;
224 gen_th.rcf = sdl->sdl_rcf;
225 memcpy(gen_th.rd, sdl->sdl_route, rif_len - 2);
230 switch (dst->sa_family) {
233 if (!arpresolve(ifp, rt, m, dst, edst, rt0))
234 return (0); /* if not yet resolved */
235 /* Add LLC and SNAP headers */
236 M_PREPEND(m, 8, MB_DONTWAIT);
239 l = mtod(m, struct llc *);
240 l->llc_un.type_snap.ether_type = htons(ETHERTYPE_IP);
241 l->llc_dsap = l->llc_ssap = LLC_SNAP_LSAP;
242 l->llc_un.type_snap.control = LLC_UI;
243 l->llc_un.type_snap.org_code[0] = 0x0;
244 l->llc_un.type_snap.org_code[1] = 0x0;
245 l->llc_un.type_snap.org_code[2] = 0x0;
246 memcpy(gen_th.iso88025_dhost, edst, sizeof(edst));
252 * For AF_UNSPEC sockaddr.sa_data must contain all of the
253 * mac information needed to send the packet. This allows
254 * full mac, llc, and source routing function to be controlled.
255 * llc and source routing information must already be in the
256 * mbuf provided, ac/fc are set in sa_data. sockaddr.sa_data
257 * should be a iso88025_sockaddr_data structure see iso88025.h
260 sd = (struct iso88025_sockaddr_data *)dst->sa_data;
263 memcpy(gen_th.iso88025_dhost, sd->ether_dhost, sizeof(sd->ether_dhost));
264 memcpy(gen_th.iso88025_shost, sd->ether_shost, sizeof(sd->ether_shost));
269 printf("%s: can't handle af%d\n", ifp->if_xname,
271 senderr(EAFNOSUPPORT);
275 * Add local net header. If no space in first mbuf,
279 M_PREPEND(m, ISO88025_HDR_LEN + rif_len, MB_DONTWAIT);
283 /* Copy as much of the generic header as is needed into the mbuf */
284 th = mtod(m, struct iso88025_header *);
285 memcpy(th, &gen_th, ISO88025_HDR_LEN + rif_len);
288 * If a simplex interface, and the packet is being sent to our
289 * Ethernet address or a broadcast address, loopback a copy.
290 * XXX To make a simplex device behave exactly like a duplex
291 * device, we should copy in the case of sending to our own
292 * ethernet address (thus letting the original actually appear
293 * on the wire). However, we don't do that here for security
294 * reasons and compatibility with the original behavior.
296 if ((ifp->if_flags & IFF_SIMPLEX) &&
298 if ((m->m_flags & M_BCAST) || (loop_copy > 0)) {
299 struct mbuf *n = m_copy(m, 0, (int)M_COPYALL);
300 (void) if_simloop(ifp,
301 n, dst->sa_family, ISO88025_HDR_LEN);
302 } else if (bcmp(th->iso88025_dhost,
303 th->iso88025_shost, ETHER_ADDR_LEN) == 0) {
304 (void) if_simloop(ifp,
305 m, dst->sa_family, ISO88025_HDR_LEN);
312 * Queue message on interface, and start output if interface
315 if (IF_QFULL(&ifp->if_snd)) {
316 printf("iso88025_output: packet dropped QFULL.\n");
317 IF_DROP(&ifp->if_snd);
321 if (m->m_flags & M_MCAST)
323 IF_ENQUEUE(&ifp->if_snd, m);
324 if ((ifp->if_flags & IFF_OACTIVE) == 0)
325 (*ifp->if_start)(ifp);
327 ifp->if_obytes += len + ISO88025_HDR_LEN + 8;
337 * ISO 88025 de-encapsulation
340 iso88025_input(struct ifnet *ifp, struct mbuf *m)
343 struct iso88025_header *th = mtod(m, struct iso88025_header *);
347 if ((ifp->if_flags & IFF_UP) == 0) {
352 hdr_len = ISO88025_HDR_LEN;
353 if (th->iso88025_shost[0] & 0x80)
354 hdr_len += (ntohs(th->rcf) & 0x1f00) >> 8;
356 if (m->m_len < hdr_len) {
360 m->m_pkthdr.len -= hdr_len;
362 m->m_data += hdr_len;
364 l = mtod(m, struct llc *);
366 switch (l->llc_control) {
373 struct arpcom *ac = (struct arpcom *)ifp;
374 struct iso88025_sockaddr_data *th2;
376 u_char c = l->llc_dsap;
378 if (th->iso88025_shost[0] & TR_RII) { /* XXX */
379 printf("iso88025_input: dropping source routed LLC_TEST\n");
383 l->llc_dsap = l->llc_ssap;
385 if (m->m_flags & (M_BCAST | M_MCAST))
386 bcopy((caddr_t)ac->ac_enaddr,
387 (caddr_t)th->iso88025_dhost, ISO88025_ADDR_LEN);
388 sa.sa_family = AF_UNSPEC;
389 sa.sa_len = sizeof(sa);
390 th2 = (struct iso88025_sockaddr_data *)sa.sa_data;
391 for (i = 0; i < ISO88025_ADDR_LEN; i++) {
392 th2->ether_shost[i] = c = th->iso88025_dhost[i];
393 th2->ether_dhost[i] = th->iso88025_dhost[i] = th->iso88025_shost[i];
394 th->iso88025_shost[i] = c;
397 th2->fc = TR_LLC_FRAME;
398 ifp->if_output(ifp, m, &sa, NULL);
402 printf("iso88025_input: unexpected llc control 0x%02x\n", l->llc_control);
407 m->m_pkthdr.len -= 8;
409 m->m_data += 8; /* Length of LLC header in our case */
411 ifp->if_ibytes += m->m_pkthdr.len + sizeof(*th);
412 if (th->iso88025_dhost[0] & 1) {
413 if (bcmp(ifp->if_broadcastaddr, th->iso88025_dhost,
414 ifp->if_addrlen) == 0)
415 m->m_flags |= M_BCAST;
417 m->m_flags |= M_MCAST;
419 if (m->m_flags & (M_BCAST|M_MCAST))
422 ether_type = ntohs(l->llc_un.type_snap.ether_type);
424 switch (ether_type) {
427 th->iso88025_shost[0] &= ~(TR_RII);
428 if (ipflow_fastforward(m))
434 if (ifp->if_flags & IFF_NOARP) {
446 netisr_dispatch(isr, m);