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b688fc87 WJ |
1 | /* |
2 | * Copyright (c) 1982, 1989 Regents of the University of California. | |
3 | * All rights reserved. | |
4 | * | |
5 | * Redistribution and use in source and binary forms, with or without | |
6 | * modification, are permitted provided that the following conditions | |
7 | * are met: | |
8 | * 1. Redistributions of source code must retain the above copyright | |
9 | * notice, this list of conditions and the following disclaimer. | |
10 | * 2. Redistributions in binary form must reproduce the above copyright | |
11 | * notice, this list of conditions and the following disclaimer in the | |
12 | * documentation and/or other materials provided with the distribution. | |
13 | * 3. All advertising materials mentioning features or use of this software | |
14 | * must display the following acknowledgement: | |
15 | * This product includes software developed by the University of | |
16 | * California, Berkeley and its contributors. | |
17 | * 4. Neither the name of the University nor the names of its contributors | |
18 | * may be used to endorse or promote products derived from this software | |
19 | * without specific prior written permission. | |
20 | * | |
21 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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 | |
31 | * SUCH DAMAGE. | |
32 | * | |
33 | * @(#)if_ethersubr.c 7.13 (Berkeley) 4/20/91 | |
34 | */ | |
35 | ||
36 | #include "param.h" | |
37 | #include "systm.h" | |
38 | #include "kernel.h" | |
39 | #include "malloc.h" | |
40 | #include "mbuf.h" | |
41 | #include "protosw.h" | |
42 | #include "socket.h" | |
43 | #include "ioctl.h" | |
44 | #include "errno.h" | |
45 | #include "syslog.h" | |
46 | ||
47 | #include "if.h" | |
48 | #include "netisr.h" | |
49 | #include "route.h" | |
50 | #include "if_llc.h" | |
51 | #include "if_dl.h" | |
52 | ||
53 | #include "machine/mtpr.h" | |
54 | ||
55 | #ifdef INET | |
56 | #include "../netinet/in.h" | |
57 | #include "../netinet/in_var.h" | |
58 | #endif | |
59 | #include "../netinet/if_ether.h" | |
60 | ||
61 | #ifdef NS | |
62 | #include "../netns/ns.h" | |
63 | #include "../netns/ns_if.h" | |
64 | #endif | |
65 | ||
66 | #ifdef ISO | |
67 | #include "../netiso/argo_debug.h" | |
68 | #include "../netiso/iso.h" | |
69 | #include "../netiso/iso_var.h" | |
70 | #include "../netiso/iso_snpac.h" | |
71 | #endif | |
72 | ||
73 | u_char etherbroadcastaddr[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; | |
74 | extern struct ifnet loif; | |
75 | ||
76 | /* | |
77 | * Ethernet output routine. | |
78 | * Encapsulate a packet of type family for the local net. | |
79 | * Use trailer local net encapsulation if enough data in first | |
80 | * packet leaves a multiple of 512 bytes of data in remainder. | |
81 | * Assumes that ifp is actually pointer to arpcom structure. | |
82 | */ | |
83 | ether_output(ifp, m0, dst, rt) | |
84 | register struct ifnet *ifp; | |
85 | struct mbuf *m0; | |
86 | struct sockaddr *dst; | |
87 | struct rtentry *rt; | |
88 | { | |
89 | short type; | |
90 | int s, error = 0; | |
91 | u_char edst[6]; | |
92 | struct in_addr idst; | |
93 | register struct mbuf *m = m0; | |
94 | struct mbuf *mcopy = (struct mbuf *)0; | |
95 | register struct ether_header *eh; | |
96 | int usetrailers, off, len = m->m_pkthdr.len; | |
97 | #define ac ((struct arpcom *)ifp) | |
98 | ||
99 | if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) { | |
100 | error = ENETDOWN; | |
101 | goto bad; | |
102 | } | |
103 | ifp->if_lastchange = time; | |
104 | switch (dst->sa_family) { | |
105 | ||
106 | #ifdef INET | |
107 | case AF_INET: | |
108 | idst = ((struct sockaddr_in *)dst)->sin_addr; | |
109 | if (!arpresolve(ac, m, &idst, edst, &usetrailers)) | |
110 | return (0); /* if not yet resolved */ | |
111 | if ((ifp->if_flags & IFF_SIMPLEX) && (*edst & 1)) | |
112 | mcopy = m_copy(m, 0, (int)M_COPYALL); | |
113 | off = m->m_pkthdr.len - m->m_len; | |
114 | if (usetrailers && off > 0 && (off & 0x1ff) == 0 && | |
115 | (m->m_flags & M_EXT) == 0 && | |
116 | m->m_data >= m->m_pktdat + 2 * sizeof (u_short)) { | |
117 | type = ETHERTYPE_TRAIL + (off>>9); | |
118 | m->m_data -= 2 * sizeof (u_short); | |
119 | m->m_len += 2 * sizeof (u_short); | |
120 | len += 2 * sizeof (u_short); | |
121 | *mtod(m, u_short *) = htons((u_short)ETHERTYPE_IP); | |
122 | *(mtod(m, u_short *) + 1) = htons((u_short)m->m_len); | |
123 | goto gottrailertype; | |
124 | } | |
125 | type = ETHERTYPE_IP; | |
126 | goto gottype; | |
127 | #endif | |
128 | #ifdef NS | |
129 | case AF_NS: | |
130 | type = ETHERTYPE_NS; | |
131 | bcopy((caddr_t)&(((struct sockaddr_ns *)dst)->sns_addr.x_host), | |
132 | (caddr_t)edst, sizeof (edst)); | |
133 | if (!bcmp((caddr_t)edst, (caddr_t)&ns_thishost, sizeof(edst))) | |
134 | return (looutput(ifp, m, dst, rt)); | |
135 | if ((ifp->if_flags & IFF_SIMPLEX) && (*edst & 1)) | |
136 | mcopy = m_copy(m, 0, (int)M_COPYALL); | |
137 | goto gottype; | |
138 | #endif | |
139 | #ifdef ISO | |
140 | case AF_ISO: { | |
141 | int snpalen; | |
142 | struct llc *l; | |
143 | ||
144 | iso_again: | |
145 | if (rt && rt->rt_gateway && (rt->rt_flags & RTF_UP)) { | |
146 | if (rt->rt_flags & RTF_GATEWAY) { | |
147 | if (rt->rt_llinfo) { | |
148 | rt = (struct rtentry *)rt->rt_llinfo; | |
149 | goto iso_again; | |
150 | } | |
151 | } else { | |
152 | register struct sockaddr_dl *sdl = | |
153 | (struct sockaddr_dl *)rt->rt_gateway; | |
154 | if (sdl && sdl->sdl_family == AF_LINK | |
155 | && sdl->sdl_alen > 0) { | |
156 | bcopy(LLADDR(sdl), (char *)edst, | |
157 | sizeof(edst)); | |
158 | goto iso_resolved; | |
159 | } | |
160 | } | |
161 | } | |
162 | if ((error = iso_snparesolve(ifp, (struct sockaddr_iso *)dst, | |
163 | (char *)edst, &snpalen)) > 0) | |
164 | goto bad; /* Not Resolved */ | |
165 | iso_resolved: | |
166 | if ((ifp->if_flags & IFF_SIMPLEX) && (*edst & 1) && | |
167 | (mcopy = m_copy(m, 0, (int)M_COPYALL))) { | |
168 | M_PREPEND(mcopy, sizeof (*eh), M_DONTWAIT); | |
169 | if (mcopy) { | |
170 | eh = mtod(mcopy, struct ether_header *); | |
171 | bcopy((caddr_t)edst, | |
172 | (caddr_t)eh->ether_dhost, sizeof (edst)); | |
173 | bcopy((caddr_t)ac->ac_enaddr, | |
174 | (caddr_t)eh->ether_shost, sizeof (edst)); | |
175 | } | |
176 | } | |
177 | M_PREPEND(m, 3, M_DONTWAIT); | |
178 | if (m == NULL) | |
179 | return (0); | |
180 | type = m->m_pkthdr.len; | |
181 | l = mtod(m, struct llc *); | |
182 | l->llc_dsap = l->llc_ssap = LLC_ISO_LSAP; | |
183 | l->llc_control = LLC_UI; | |
184 | len += 3; | |
185 | IFDEBUG(D_ETHER) | |
186 | int i; | |
187 | printf("unoutput: sending pkt to: "); | |
188 | for (i=0; i<6; i++) | |
189 | printf("%x ", edst[i] & 0xff); | |
190 | printf("\n"); | |
191 | ENDDEBUG | |
192 | } goto gottype; | |
193 | #endif ISO | |
194 | #ifdef RMP | |
195 | case AF_RMP: | |
196 | /* | |
197 | * This is IEEE 802.3 -- the Ethernet `type' field is | |
198 | * really a `length' field. | |
199 | */ | |
200 | type = m->m_len; | |
201 | bcopy((caddr_t)dst->sa_data, (caddr_t)edst, sizeof(edst)); | |
202 | break; | |
203 | #endif | |
204 | ||
205 | case AF_UNSPEC: | |
206 | eh = (struct ether_header *)dst->sa_data; | |
207 | bcopy((caddr_t)eh->ether_dhost, (caddr_t)edst, sizeof (edst)); | |
208 | type = eh->ether_type; | |
209 | goto gottype; | |
210 | ||
211 | default: | |
212 | printf("%s%d: can't handle af%d\n", ifp->if_name, ifp->if_unit, | |
213 | dst->sa_family); | |
214 | error = EAFNOSUPPORT; | |
215 | goto bad; | |
216 | } | |
217 | ||
218 | gottrailertype: | |
219 | /* | |
220 | * Packet to be sent as trailer: move first packet | |
221 | * (control information) to end of chain. | |
222 | */ | |
223 | while (m->m_next) | |
224 | m = m->m_next; | |
225 | m->m_next = m0; | |
226 | m = m0->m_next; | |
227 | m0->m_next = 0; | |
228 | ||
229 | gottype: | |
230 | if (mcopy) | |
231 | (void) looutput(ifp, mcopy, dst, rt); | |
232 | /* | |
233 | * Add local net header. If no space in first mbuf, | |
234 | * allocate another. | |
235 | */ | |
236 | M_PREPEND(m, sizeof (struct ether_header), M_DONTWAIT); | |
237 | if (m == 0) { | |
238 | error = ENOBUFS; | |
239 | goto bad; | |
240 | } | |
241 | eh = mtod(m, struct ether_header *); | |
242 | type = htons((u_short)type); | |
243 | bcopy((caddr_t)&type,(caddr_t)&eh->ether_type, | |
244 | sizeof(eh->ether_type)); | |
245 | bcopy((caddr_t)edst, (caddr_t)eh->ether_dhost, sizeof (edst)); | |
246 | bcopy((caddr_t)ac->ac_enaddr, (caddr_t)eh->ether_shost, | |
247 | sizeof(eh->ether_shost)); | |
248 | s = splimp(); | |
249 | /* | |
250 | * Queue message on interface, and start output if interface | |
251 | * not yet active. | |
252 | */ | |
253 | if (IF_QFULL(&ifp->if_snd)) { | |
254 | IF_DROP(&ifp->if_snd); | |
255 | splx(s); | |
256 | error = ENOBUFS; | |
257 | goto bad; | |
258 | } | |
259 | IF_ENQUEUE(&ifp->if_snd, m); | |
260 | if ((ifp->if_flags & IFF_OACTIVE) == 0) | |
261 | (*ifp->if_start)(ifp); | |
262 | splx(s); | |
263 | ifp->if_obytes += len + sizeof (struct ether_header); | |
264 | if (edst[0] & 1) | |
265 | ifp->if_omcasts++; | |
266 | return (error); | |
267 | ||
268 | bad: | |
269 | if (m) | |
270 | m_freem(m); | |
271 | return (error); | |
272 | } | |
273 | ||
274 | /* | |
275 | * Process a received Ethernet packet; | |
276 | * the packet is in the mbuf chain m without | |
277 | * the ether header, which is provided separately. | |
278 | */ | |
279 | ether_input(ifp, eh, m) | |
280 | struct ifnet *ifp; | |
281 | register struct ether_header *eh; | |
282 | struct mbuf *m; | |
283 | { | |
284 | register struct ifqueue *inq; | |
285 | register struct llc *l; | |
286 | int s; | |
287 | ||
288 | ifp->if_lastchange = time; | |
289 | ifp->if_ibytes += m->m_pkthdr.len + sizeof (*eh); | |
290 | if (bcmp((caddr_t)etherbroadcastaddr, (caddr_t)eh->ether_dhost, | |
291 | sizeof(etherbroadcastaddr)) == 0) | |
292 | m->m_flags |= M_BCAST; | |
293 | else if (eh->ether_dhost[0] & 1) | |
294 | m->m_flags |= M_MCAST; | |
295 | if (m->m_flags & (M_BCAST|M_MCAST)) | |
296 | ifp->if_imcasts++; | |
297 | ||
298 | switch (eh->ether_type) { | |
299 | #ifdef INET | |
300 | case ETHERTYPE_IP: | |
301 | schednetisr(NETISR_IP); | |
302 | inq = &ipintrq; | |
303 | break; | |
304 | ||
305 | case ETHERTYPE_ARP: | |
306 | arpinput((struct arpcom *)ifp, m); | |
307 | return; | |
308 | #endif | |
309 | #ifdef NS | |
310 | case ETHERTYPE_NS: | |
311 | schednetisr(NETISR_NS); | |
312 | inq = &nsintrq; | |
313 | break; | |
314 | ||
315 | #endif | |
316 | default: | |
317 | #ifdef ISO | |
318 | if (eh->ether_type > ETHERMTU) | |
319 | goto dropanyway; | |
320 | l = mtod(m, struct llc *); | |
321 | switch (l->llc_control) { | |
322 | case LLC_UI: | |
323 | /* LLC_UI_P forbidden in class 1 service */ | |
324 | if ((l->llc_dsap == LLC_ISO_LSAP) && | |
325 | (l->llc_ssap == LLC_ISO_LSAP)) { | |
326 | /* LSAP for ISO */ | |
327 | if (m->m_pkthdr.len > eh->ether_type) | |
328 | m_adj(m, eh->ether_type - m->m_pkthdr.len); | |
329 | m->m_data += 3; /* XXX */ | |
330 | m->m_len -= 3; /* XXX */ | |
331 | m->m_pkthdr.len -= 3; /* XXX */ | |
332 | M_PREPEND(m, sizeof *eh, M_DONTWAIT); | |
333 | if (m == 0) | |
334 | return; | |
335 | *mtod(m, struct ether_header *) = *eh; | |
336 | IFDEBUG(D_ETHER) | |
337 | printf("clnp packet"); | |
338 | ENDDEBUG | |
339 | schednetisr(NETISR_ISO); | |
340 | inq = &clnlintrq; | |
341 | break; | |
342 | } | |
343 | goto dropanyway; | |
344 | ||
345 | case LLC_XID: | |
346 | case LLC_XID_P: | |
347 | if(m->m_len < 6) | |
348 | goto dropanyway; | |
349 | l->llc_window = 0; | |
350 | l->llc_fid = 9; | |
351 | l->llc_class = 1; | |
352 | l->llc_dsap = l->llc_ssap = 0; | |
353 | /* Fall through to */ | |
354 | case LLC_TEST: | |
355 | case LLC_TEST_P: | |
356 | { | |
357 | struct sockaddr sa; | |
358 | register struct ether_header *eh2; | |
359 | int i; | |
360 | u_char c = l->llc_dsap; | |
361 | l->llc_dsap = l->llc_ssap; | |
362 | l->llc_ssap = c; | |
363 | if (m->m_flags & (M_BCAST | M_MCAST)) | |
364 | bcopy((caddr_t)ac->ac_enaddr, | |
365 | (caddr_t)eh->ether_dhost, 6); | |
366 | sa.sa_family = AF_UNSPEC; | |
367 | sa.sa_len = sizeof(sa); | |
368 | eh2 = (struct ether_header *)sa.sa_data; | |
369 | for (i = 0; i < 6; i++) { | |
370 | eh2->ether_shost[i] = c = eh->ether_dhost[i]; | |
371 | eh2->ether_dhost[i] = | |
372 | eh->ether_dhost[i] = eh->ether_shost[i]; | |
373 | eh->ether_shost[i] = c; | |
374 | } | |
375 | ifp->if_output(ifp, m, &sa); | |
376 | return; | |
377 | } | |
378 | dropanyway: | |
379 | default: | |
380 | m_freem(m); | |
381 | return; | |
382 | } | |
383 | #else | |
384 | m_freem(m); | |
385 | return; | |
386 | #endif ISO | |
387 | } | |
388 | ||
389 | s = splimp(); | |
390 | if (IF_QFULL(inq)) { | |
391 | IF_DROP(inq); | |
392 | m_freem(m); | |
393 | } else | |
394 | IF_ENQUEUE(inq, m); | |
395 | splx(s); | |
396 | } | |
397 | ||
398 | /* | |
399 | * Convert Ethernet address to printable (loggable) representation. | |
400 | */ | |
401 | static char digits[] = "0123456789abcdef"; | |
402 | char * | |
403 | ether_sprintf(ap) | |
404 | register u_char *ap; | |
405 | { | |
406 | register i; | |
407 | static char etherbuf[18]; | |
408 | register char *cp = etherbuf; | |
409 | ||
410 | for (i = 0; i < 6; i++) { | |
411 | *cp++ = digits[*ap >> 4]; | |
412 | *cp++ = digits[*ap++ & 0xf]; | |
413 | *cp++ = ':'; | |
414 | } | |
415 | *--cp = 0; | |
416 | return (etherbuf); | |
417 | } |