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 1.11 2005/01/06 09:14:13 hsu 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);
144 bcopy(((struct arpcom *)ifp->if_softc)->ac_enaddr,
145 ((struct sockaddr *)ifr->ifr_data)->sa_data,
151 * Set the interface MTU.
153 if (ifr->ifr_mtu > ISO88025_MAX_MTU) {
156 ifp->if_mtu = ifr->ifr_mtu;
164 * ISO88025 encapsulation
167 iso88025_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst,
170 struct iso88025_header *th;
171 struct iso88025_header gen_th;
172 struct iso88025_sockaddr_data *sd = (struct iso88025_sockaddr_data *)dst->sa_data;
174 struct sockaddr_dl *sdl = NULL;
175 int s, error = 0, rif_len = 0;
178 int len = m->m_pkthdr.len, loop_copy = 0;
179 struct arpcom *ac = (struct arpcom *)ifp;
181 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING))
185 senderr(EHOSTUNREACH);
186 error = rt_llroute(dst, rt0, &rt);
190 /* Calculate routing info length based on arp table entry. */
191 if (rt && (sdl = (struct sockaddr_dl *)rt->rt_gateway))
192 if (SDL_ISO88025(sdl)->trld_rcf != NULL)
193 rif_len = TR_RCF_RIFLEN(SDL_ISO88025(sdl)->trld_rcf);
195 /* Generate a generic 802.5 header for the packet. */
197 gen_th.fc = TR_LLC_FRAME;
198 memcpy(gen_th.iso88025_shost, ac->ac_enaddr, sizeof ac->ac_enaddr);
200 gen_th.iso88025_shost[0] |= TR_RII;
202 gen_th.rcf = sdl->sdl_rcf;
203 memcpy(gen_th.rd, sdl->sdl_route, rif_len - 2);
208 switch (dst->sa_family) {
211 if (!arpresolve(ifp, rt0, m, dst, edst))
212 return (0); /* if not yet resolved */
213 /* Add LLC and SNAP headers */
214 M_PREPEND(m, 8, MB_DONTWAIT);
217 l = mtod(m, struct llc *);
218 l->llc_un.type_snap.ether_type = htons(ETHERTYPE_IP);
219 l->llc_dsap = l->llc_ssap = LLC_SNAP_LSAP;
220 l->llc_un.type_snap.control = LLC_UI;
221 l->llc_un.type_snap.org_code[0] = 0x0;
222 l->llc_un.type_snap.org_code[1] = 0x0;
223 l->llc_un.type_snap.org_code[2] = 0x0;
224 memcpy(gen_th.iso88025_dhost, edst, sizeof(edst));
230 * For AF_UNSPEC sockaddr.sa_data must contain all of the
231 * mac information needed to send the packet. This allows
232 * full mac, llc, and source routing function to be controlled.
233 * llc and source routing information must already be in the
234 * mbuf provided, ac/fc are set in sa_data. sockaddr.sa_data
235 * should be a iso88025_sockaddr_data structure see iso88025.h
238 sd = (struct iso88025_sockaddr_data *)dst->sa_data;
241 memcpy(gen_th.iso88025_dhost, sd->ether_dhost, sizeof(sd->ether_dhost));
242 memcpy(gen_th.iso88025_shost, sd->ether_shost, sizeof(sd->ether_shost));
247 printf("%s: can't handle af%d\n", ifp->if_xname,
249 senderr(EAFNOSUPPORT);
253 * Add local net header. If no space in first mbuf,
257 M_PREPEND(m, ISO88025_HDR_LEN + rif_len, MB_DONTWAIT);
261 /* Copy as much of the generic header as is needed into the mbuf */
262 th = mtod(m, struct iso88025_header *);
263 memcpy(th, &gen_th, ISO88025_HDR_LEN + rif_len);
266 * If a simplex interface, and the packet is being sent to our
267 * Ethernet address or a broadcast address, loopback a copy.
268 * XXX To make a simplex device behave exactly like a duplex
269 * device, we should copy in the case of sending to our own
270 * ethernet address (thus letting the original actually appear
271 * on the wire). However, we don't do that here for security
272 * reasons and compatibility with the original behavior.
274 if ((ifp->if_flags & IFF_SIMPLEX) &&
276 if ((m->m_flags & M_BCAST) || (loop_copy > 0)) {
277 struct mbuf *n = m_copypacket(m, MB_DONTWAIT);
279 if_simloop(ifp, n, dst->sa_family, ISO88025_HDR_LEN);
280 } else if (bcmp(th->iso88025_dhost,
281 th->iso88025_shost, ETHER_ADDR_LEN) == 0) {
282 if_simloop(ifp, m, dst->sa_family, ISO88025_HDR_LEN);
283 return (0); /* XXX */
289 * Queue message on interface, and start output if interface
292 if (IF_QFULL(&ifp->if_snd)) {
293 printf("iso88025_output: packet dropped QFULL.\n");
294 IF_DROP(&ifp->if_snd);
298 if (m->m_flags & M_MCAST)
300 IF_ENQUEUE(&ifp->if_snd, m);
301 if (!(ifp->if_flags & IFF_OACTIVE))
302 (*ifp->if_start)(ifp);
304 ifp->if_obytes += len + ISO88025_HDR_LEN + 8;
313 * ISO 88025 de-encapsulation
316 iso88025_input(struct ifnet *ifp, struct mbuf *m)
319 struct iso88025_header *th = mtod(m, struct iso88025_header *);
323 if (!(ifp->if_flags & IFF_UP)) {
328 hdr_len = ISO88025_HDR_LEN;
329 if (th->iso88025_shost[0] & 0x80)
330 hdr_len += (ntohs(th->rcf) & 0x1f00) >> 8;
332 if (m->m_len < hdr_len) {
336 m->m_pkthdr.len -= hdr_len;
338 m->m_data += hdr_len;
340 l = mtod(m, struct llc *);
342 switch (l->llc_control) {
349 struct arpcom *ac = (struct arpcom *)ifp;
350 struct iso88025_sockaddr_data *th2;
352 u_char c = l->llc_dsap;
354 if (th->iso88025_shost[0] & TR_RII) { /* XXX */
355 printf("iso88025_input: dropping source routed LLC_TEST\n");
359 l->llc_dsap = l->llc_ssap;
361 if (m->m_flags & (M_BCAST | M_MCAST))
362 bcopy(ac->ac_enaddr, th->iso88025_dhost,
364 sa.sa_family = AF_UNSPEC;
365 sa.sa_len = sizeof(sa);
366 th2 = (struct iso88025_sockaddr_data *)sa.sa_data;
367 for (i = 0; i < ISO88025_ADDR_LEN; i++) {
368 th2->ether_shost[i] = c = th->iso88025_dhost[i];
369 th2->ether_dhost[i] = th->iso88025_dhost[i] = th->iso88025_shost[i];
370 th->iso88025_shost[i] = c;
373 th2->fc = TR_LLC_FRAME;
374 ifp->if_output(ifp, m, &sa, NULL);
378 printf("iso88025_input: unexpected llc control 0x%02x\n", l->llc_control);
383 m->m_pkthdr.len -= 8;
385 m->m_data += 8; /* Length of LLC header in our case */
387 ifp->if_ibytes += m->m_pkthdr.len + sizeof(*th);
388 if (th->iso88025_dhost[0] & 1) {
389 if (bcmp(ifp->if_broadcastaddr, th->iso88025_dhost,
390 ifp->if_addrlen) == 0)
391 m->m_flags |= M_BCAST;
393 m->m_flags |= M_MCAST;
395 if (m->m_flags & (M_BCAST|M_MCAST))
398 ether_type = ntohs(l->llc_un.type_snap.ether_type);
400 switch (ether_type) {
403 th->iso88025_shost[0] &= ~(TR_RII);
404 if (ipflow_fastforward(m))
410 if (ifp->if_flags & IFF_NOARP) {
422 netisr_dispatch(isr, m);