Commit | Line | Data |
---|---|---|
132c65ba | 1 | /* |
5f08a978 | 2 | * Copyright (c) 1982, 1989 Regents of the University of California. |
132c65ba KF |
3 | * All rights reserved. |
4 | * | |
dbf0c423 | 5 | * %sccs.include.redist.c% |
132c65ba | 6 | * |
e6ff5635 | 7 | * @(#)if_ethersubr.c 7.14 (Berkeley) %G% |
132c65ba KF |
8 | */ |
9 | ||
10 | #include "param.h" | |
11 | #include "systm.h" | |
c1ee97b0 | 12 | #include "kernel.h" |
132c65ba KF |
13 | #include "malloc.h" |
14 | #include "mbuf.h" | |
15 | #include "protosw.h" | |
16 | #include "socket.h" | |
17 | #include "ioctl.h" | |
18 | #include "errno.h" | |
19 | #include "syslog.h" | |
20 | ||
21 | #include "if.h" | |
22 | #include "netisr.h" | |
23 | #include "route.h" | |
38a81509 | 24 | #include "if_llc.h" |
11105e87 | 25 | #include "if_dl.h" |
132c65ba | 26 | |
d301d150 | 27 | #include "machine/mtpr.h" |
132c65ba KF |
28 | |
29 | #ifdef INET | |
30 | #include "../netinet/in.h" | |
31 | #include "../netinet/in_var.h" | |
132c65ba | 32 | #endif |
0a219e9a | 33 | #include "../netinet/if_ether.h" |
132c65ba KF |
34 | |
35 | #ifdef NS | |
36 | #include "../netns/ns.h" | |
37 | #include "../netns/ns_if.h" | |
38 | #endif | |
39 | ||
b72a6efb KS |
40 | #ifdef ISO |
41 | #include "../netiso/argo_debug.h" | |
42 | #include "../netiso/iso.h" | |
43 | #include "../netiso/iso_var.h" | |
983eada9 | 44 | #include "../netiso/iso_snpac.h" |
b72a6efb KS |
45 | #endif |
46 | ||
132c65ba | 47 | u_char etherbroadcastaddr[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; |
38a81509 | 48 | extern struct ifnet loif; |
e6ff5635 | 49 | #define senderr(e) { error = (e); goto bad;} |
132c65ba KF |
50 | |
51 | /* | |
52 | * Ethernet output routine. | |
53 | * Encapsulate a packet of type family for the local net. | |
54 | * Use trailer local net encapsulation if enough data in first | |
55 | * packet leaves a multiple of 512 bytes of data in remainder. | |
56 | * Assumes that ifp is actually pointer to arpcom structure. | |
57 | */ | |
e6ff5635 | 58 | ether_output(ifp, m0, dst, rt0) |
132c65ba KF |
59 | register struct ifnet *ifp; |
60 | struct mbuf *m0; | |
61 | struct sockaddr *dst; | |
e6ff5635 | 62 | struct rtentry *rt0; |
132c65ba | 63 | { |
38a81509 MK |
64 | short type; |
65 | int s, error = 0; | |
132c65ba | 66 | u_char edst[6]; |
132c65ba | 67 | register struct mbuf *m = m0; |
e6ff5635 | 68 | register struct rtentry *rt; |
38a81509 | 69 | struct mbuf *mcopy = (struct mbuf *)0; |
132c65ba | 70 | register struct ether_header *eh; |
5f08a978 | 71 | int usetrailers, off, len = m->m_pkthdr.len; |
132c65ba KF |
72 | #define ac ((struct arpcom *)ifp) |
73 | ||
e6ff5635 KS |
74 | if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) |
75 | senderr(ENETDOWN); | |
5f08a978 | 76 | ifp->if_lastchange = time; |
e6ff5635 KS |
77 | if (rt = rt0) { |
78 | if ((rt->rt_flags & RTF_UP) == 0) { | |
79 | if (rt0 = rt = rtalloc1(dst, 1)) | |
80 | rt->rt_refcnt--; | |
81 | else | |
82 | return (EHOSTUNREACH); | |
83 | } | |
84 | if (rt->rt_flags & RTF_GATEWAY) { | |
85 | if (rt->rt_gwroute == 0) | |
86 | goto lookup; | |
87 | if (((rt = rt->rt_gwroute)->rt_flags & RTF_UP) == 0) { | |
88 | rtfree(rt); rt = rt0; | |
89 | lookup: rt->rt_gwroute = rtalloc1(rt->rt_gateway, 1); | |
90 | if ((rt = rt->rt_gwroute) == 0) | |
91 | return (EHOSTUNREACH); | |
92 | } | |
93 | } | |
94 | if (rt->rt_flags & RTF_REJECT) | |
95 | if (rt->rt_rmx.rmx_expire == 0 || | |
96 | time.tv_sec < rt->rt_rmx.rmx_expire) | |
97 | return (rt == rt0 ? EHOSTDOWN : EHOSTUNREACH); | |
98 | } | |
132c65ba KF |
99 | switch (dst->sa_family) { |
100 | ||
101 | #ifdef INET | |
102 | case AF_INET: | |
e6ff5635 KS |
103 | if (!arpresolve(ac, rt, m, (struct sockaddr_in *)dst, |
104 | edst, &usetrailers)) | |
132c65ba | 105 | return (0); /* if not yet resolved */ |
b72a6efb | 106 | if ((ifp->if_flags & IFF_SIMPLEX) && (*edst & 1)) |
a927e5cb | 107 | mcopy = m_copy(m, 0, (int)M_COPYALL); |
132c65ba KF |
108 | off = m->m_pkthdr.len - m->m_len; |
109 | if (usetrailers && off > 0 && (off & 0x1ff) == 0 && | |
110 | (m->m_flags & M_EXT) == 0 && | |
111 | m->m_data >= m->m_pktdat + 2 * sizeof (u_short)) { | |
112 | type = ETHERTYPE_TRAIL + (off>>9); | |
113 | m->m_data -= 2 * sizeof (u_short); | |
114 | m->m_len += 2 * sizeof (u_short); | |
5f08a978 | 115 | len += 2 * sizeof (u_short); |
132c65ba KF |
116 | *mtod(m, u_short *) = htons((u_short)ETHERTYPE_IP); |
117 | *(mtod(m, u_short *) + 1) = htons((u_short)m->m_len); | |
118 | goto gottrailertype; | |
119 | } | |
120 | type = ETHERTYPE_IP; | |
132c65ba KF |
121 | goto gottype; |
122 | #endif | |
123 | #ifdef NS | |
124 | case AF_NS: | |
125 | type = ETHERTYPE_NS; | |
126 | bcopy((caddr_t)&(((struct sockaddr_ns *)dst)->sns_addr.x_host), | |
38a81509 | 127 | (caddr_t)edst, sizeof (edst)); |
5f08a978 | 128 | if (!bcmp((caddr_t)edst, (caddr_t)&ns_thishost, sizeof(edst))) |
fe7efead | 129 | return (looutput(ifp, m, dst, rt)); |
b72a6efb | 130 | if ((ifp->if_flags & IFF_SIMPLEX) && (*edst & 1)) |
a927e5cb | 131 | mcopy = m_copy(m, 0, (int)M_COPYALL); |
132c65ba KF |
132 | goto gottype; |
133 | #endif | |
38a81509 MK |
134 | #ifdef ISO |
135 | case AF_ISO: { | |
983eada9 | 136 | int snpalen; |
b72a6efb | 137 | struct llc *l; |
e6ff5635 | 138 | register struct sockaddr_dl *sdl; |
b72a6efb | 139 | |
e6ff5635 KS |
140 | if (rt && (sdl = (struct sockaddr_dl *)rt->rt_gateway) && |
141 | sdl->sdl_family == AF_LINK && sdl->sdl_alen > 0) { | |
142 | bcopy(LLADDR(sdl), (caddr_t)edst, sizeof(edst)); | |
143 | } else if (error = | |
144 | iso_snparesolve(ifp, (struct sockaddr_iso *)dst, | |
145 | (char *)edst, &snpalen)) | |
983eada9 | 146 | goto bad; /* Not Resolved */ |
fe7efead KS |
147 | if ((ifp->if_flags & IFF_SIMPLEX) && (*edst & 1) && |
148 | (mcopy = m_copy(m, 0, (int)M_COPYALL))) { | |
149 | M_PREPEND(mcopy, sizeof (*eh), M_DONTWAIT); | |
150 | if (mcopy) { | |
151 | eh = mtod(mcopy, struct ether_header *); | |
152 | bcopy((caddr_t)edst, | |
153 | (caddr_t)eh->ether_dhost, sizeof (edst)); | |
154 | bcopy((caddr_t)ac->ac_enaddr, | |
155 | (caddr_t)eh->ether_shost, sizeof (edst)); | |
156 | } | |
157 | } | |
38a81509 | 158 | M_PREPEND(m, 3, M_DONTWAIT); |
b72a6efb | 159 | if (m == NULL) |
983eada9 | 160 | return (0); |
38a81509 MK |
161 | type = m->m_pkthdr.len; |
162 | l = mtod(m, struct llc *); | |
163 | l->llc_dsap = l->llc_ssap = LLC_ISO_LSAP; | |
164 | l->llc_control = LLC_UI; | |
5f08a978 | 165 | len += 3; |
38a81509 MK |
166 | IFDEBUG(D_ETHER) |
167 | int i; | |
168 | printf("unoutput: sending pkt to: "); | |
169 | for (i=0; i<6; i++) | |
170 | printf("%x ", edst[i] & 0xff); | |
171 | printf("\n"); | |
172 | ENDDEBUG | |
173 | } goto gottype; | |
174 | #endif ISO | |
a927e5cb KM |
175 | #ifdef RMP |
176 | case AF_RMP: | |
177 | /* | |
178 | * This is IEEE 802.3 -- the Ethernet `type' field is | |
179 | * really a `length' field. | |
180 | */ | |
181 | type = m->m_len; | |
182 | bcopy((caddr_t)dst->sa_data, (caddr_t)edst, sizeof(edst)); | |
183 | break; | |
184 | #endif | |
185 | ||
132c65ba KF |
186 | case AF_UNSPEC: |
187 | eh = (struct ether_header *)dst->sa_data; | |
188 | bcopy((caddr_t)eh->ether_dhost, (caddr_t)edst, sizeof (edst)); | |
189 | type = eh->ether_type; | |
190 | goto gottype; | |
191 | ||
192 | default: | |
193 | printf("%s%d: can't handle af%d\n", ifp->if_name, ifp->if_unit, | |
194 | dst->sa_family); | |
e6ff5635 | 195 | senderr(EAFNOSUPPORT); |
132c65ba KF |
196 | } |
197 | ||
198 | gottrailertype: | |
199 | /* | |
200 | * Packet to be sent as trailer: move first packet | |
201 | * (control information) to end of chain. | |
202 | */ | |
203 | while (m->m_next) | |
204 | m = m->m_next; | |
205 | m->m_next = m0; | |
206 | m = m0->m_next; | |
207 | m0->m_next = 0; | |
132c65ba KF |
208 | |
209 | gottype: | |
fe7efead KS |
210 | if (mcopy) |
211 | (void) looutput(ifp, mcopy, dst, rt); | |
132c65ba KF |
212 | /* |
213 | * Add local net header. If no space in first mbuf, | |
214 | * allocate another. | |
215 | */ | |
216 | M_PREPEND(m, sizeof (struct ether_header), M_DONTWAIT); | |
e6ff5635 KS |
217 | if (m == 0) |
218 | senderr(ENOBUFS); | |
132c65ba | 219 | eh = mtod(m, struct ether_header *); |
38a81509 MK |
220 | type = htons((u_short)type); |
221 | bcopy((caddr_t)&type,(caddr_t)&eh->ether_type, | |
222 | sizeof(eh->ether_type)); | |
132c65ba KF |
223 | bcopy((caddr_t)edst, (caddr_t)eh->ether_dhost, sizeof (edst)); |
224 | bcopy((caddr_t)ac->ac_enaddr, (caddr_t)eh->ether_shost, | |
225 | sizeof(eh->ether_shost)); | |
fe7efead | 226 | s = splimp(); |
132c65ba KF |
227 | /* |
228 | * Queue message on interface, and start output if interface | |
229 | * not yet active. | |
230 | */ | |
132c65ba KF |
231 | if (IF_QFULL(&ifp->if_snd)) { |
232 | IF_DROP(&ifp->if_snd); | |
233 | splx(s); | |
e6ff5635 | 234 | senderr(ENOBUFS); |
132c65ba KF |
235 | } |
236 | IF_ENQUEUE(&ifp->if_snd, m); | |
237 | if ((ifp->if_flags & IFF_OACTIVE) == 0) | |
ae4c8bc9 | 238 | (*ifp->if_start)(ifp); |
132c65ba | 239 | splx(s); |
5f08a978 KS |
240 | ifp->if_obytes += len + sizeof (struct ether_header); |
241 | if (edst[0] & 1) | |
242 | ifp->if_omcasts++; | |
38a81509 | 243 | return (error); |
132c65ba KF |
244 | |
245 | bad: | |
38a81509 MK |
246 | if (m) |
247 | m_freem(m); | |
132c65ba KF |
248 | return (error); |
249 | } | |
250 | ||
251 | /* | |
ae4c8bc9 BJ |
252 | * Process a received Ethernet packet; |
253 | * the packet is in the mbuf chain m without | |
254 | * the ether header, which is provided separately. | |
132c65ba | 255 | */ |
b72a6efb | 256 | ether_input(ifp, eh, m) |
132c65ba KF |
257 | struct ifnet *ifp; |
258 | register struct ether_header *eh; | |
259 | struct mbuf *m; | |
260 | { | |
261 | register struct ifqueue *inq; | |
38a81509 | 262 | register struct llc *l; |
132c65ba KF |
263 | int s; |
264 | ||
5f08a978 KS |
265 | ifp->if_lastchange = time; |
266 | ifp->if_ibytes += m->m_pkthdr.len + sizeof (*eh); | |
38a81509 | 267 | if (bcmp((caddr_t)etherbroadcastaddr, (caddr_t)eh->ether_dhost, |
132c65ba KF |
268 | sizeof(etherbroadcastaddr)) == 0) |
269 | m->m_flags |= M_BCAST; | |
38a81509 MK |
270 | else if (eh->ether_dhost[0] & 1) |
271 | m->m_flags |= M_MCAST; | |
5f08a978 KS |
272 | if (m->m_flags & (M_BCAST|M_MCAST)) |
273 | ifp->if_imcasts++; | |
132c65ba KF |
274 | |
275 | switch (eh->ether_type) { | |
276 | #ifdef INET | |
277 | case ETHERTYPE_IP: | |
278 | schednetisr(NETISR_IP); | |
279 | inq = &ipintrq; | |
280 | break; | |
281 | ||
282 | case ETHERTYPE_ARP: | |
e6ff5635 KS |
283 | schednetisr(NETISR_ARP); |
284 | inq = &arpintrq; | |
285 | break; | |
132c65ba KF |
286 | #endif |
287 | #ifdef NS | |
288 | case ETHERTYPE_NS: | |
289 | schednetisr(NETISR_NS); | |
290 | inq = &nsintrq; | |
291 | break; | |
292 | ||
293 | #endif | |
294 | default: | |
ae4c8bc9 | 295 | #ifdef ISO |
b72a6efb | 296 | if (eh->ether_type > ETHERMTU) |
38a81509 MK |
297 | goto dropanyway; |
298 | l = mtod(m, struct llc *); | |
299 | switch (l->llc_control) { | |
300 | case LLC_UI: | |
301 | /* LLC_UI_P forbidden in class 1 service */ | |
302 | if ((l->llc_dsap == LLC_ISO_LSAP) && | |
303 | (l->llc_ssap == LLC_ISO_LSAP)) { | |
38a81509 | 304 | /* LSAP for ISO */ |
fe7efead KS |
305 | if (m->m_pkthdr.len > eh->ether_type) |
306 | m_adj(m, eh->ether_type - m->m_pkthdr.len); | |
ae4c8bc9 BJ |
307 | m->m_data += 3; /* XXX */ |
308 | m->m_len -= 3; /* XXX */ | |
309 | m->m_pkthdr.len -= 3; /* XXX */ | |
b72a6efb KS |
310 | M_PREPEND(m, sizeof *eh, M_DONTWAIT); |
311 | if (m == 0) | |
312 | return; | |
313 | *mtod(m, struct ether_header *) = *eh; | |
314 | IFDEBUG(D_ETHER) | |
315 | printf("clnp packet"); | |
316 | ENDDEBUG | |
317 | schednetisr(NETISR_ISO); | |
38a81509 | 318 | inq = &clnlintrq; |
ae4c8bc9 | 319 | break; |
38a81509 | 320 | } |
ae4c8bc9 BJ |
321 | goto dropanyway; |
322 | ||
38a81509 MK |
323 | case LLC_XID: |
324 | case LLC_XID_P: | |
325 | if(m->m_len < 6) | |
326 | goto dropanyway; | |
327 | l->llc_window = 0; | |
328 | l->llc_fid = 9; | |
329 | l->llc_class = 1; | |
330 | l->llc_dsap = l->llc_ssap = 0; | |
331 | /* Fall through to */ | |
332 | case LLC_TEST: | |
333 | case LLC_TEST_P: | |
334 | { | |
335 | struct sockaddr sa; | |
336 | register struct ether_header *eh2; | |
337 | int i; | |
338 | u_char c = l->llc_dsap; | |
339 | l->llc_dsap = l->llc_ssap; | |
340 | l->llc_ssap = c; | |
b72a6efb KS |
341 | if (m->m_flags & (M_BCAST | M_MCAST)) |
342 | bcopy((caddr_t)ac->ac_enaddr, | |
343 | (caddr_t)eh->ether_dhost, 6); | |
38a81509 | 344 | sa.sa_family = AF_UNSPEC; |
b72a6efb | 345 | sa.sa_len = sizeof(sa); |
38a81509 MK |
346 | eh2 = (struct ether_header *)sa.sa_data; |
347 | for (i = 0; i < 6; i++) { | |
348 | eh2->ether_shost[i] = c = eh->ether_dhost[i]; | |
349 | eh2->ether_dhost[i] = | |
350 | eh->ether_dhost[i] = eh->ether_shost[i]; | |
351 | eh->ether_shost[i] = c; | |
352 | } | |
353 | ifp->if_output(ifp, m, &sa); | |
354 | return; | |
355 | } | |
356 | dropanyway: | |
357 | default: | |
358 | m_freem(m); | |
359 | return; | |
360 | } | |
ae4c8bc9 BJ |
361 | #else |
362 | m_freem(m); | |
363 | return; | |
364 | #endif ISO | |
132c65ba KF |
365 | } |
366 | ||
367 | s = splimp(); | |
368 | if (IF_QFULL(inq)) { | |
369 | IF_DROP(inq); | |
370 | m_freem(m); | |
371 | } else | |
372 | IF_ENQUEUE(inq, m); | |
373 | splx(s); | |
374 | } | |
375 | ||
376 | /* | |
377 | * Convert Ethernet address to printable (loggable) representation. | |
378 | */ | |
b72a6efb | 379 | static char digits[] = "0123456789abcdef"; |
132c65ba KF |
380 | char * |
381 | ether_sprintf(ap) | |
382 | register u_char *ap; | |
383 | { | |
384 | register i; | |
385 | static char etherbuf[18]; | |
386 | register char *cp = etherbuf; | |
132c65ba KF |
387 | |
388 | for (i = 0; i < 6; i++) { | |
389 | *cp++ = digits[*ap >> 4]; | |
390 | *cp++ = digits[*ap++ & 0xf]; | |
391 | *cp++ = ':'; | |
392 | } | |
393 | *--cp = 0; | |
394 | return (etherbuf); | |
395 | } |