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15 * This product includes software developed by the University of
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30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * @(#)ns_input.c 8.1 (Berkeley) 6/10/93
34 * $FreeBSD: src/sys/netns/ns_input.c,v 1.13 2000/02/13 03:32:04 peter Exp $
35 * $DragonFly: src/sys/netproto/ns/ns_input.c,v 1.9 2004/03/06 01:58:57 hsu Exp $
38 #include <sys/param.h>
39 #include <sys/systm.h>
40 #include <sys/malloc.h>
42 #include <sys/domain.h>
43 #include <sys/protosw.h>
44 #include <sys/socket.h>
45 #include <sys/socketvar.h>
46 #include <sys/errno.h>
48 #include <sys/kernel.h>
51 #include <net/route.h>
52 #include <net/raw_cb.h>
53 #include <net/netisr.h>
62 extern void spp_input(struct mbuf *, struct nspcb *); /* spp_usrreq.c XXX */
67 union ns_host ns_thishost;
68 union ns_host ns_zerohost;
69 union ns_host ns_broadhost;
70 union ns_net ns_zeronet;
71 union ns_net ns_broadnet;
72 struct sockaddr_ns ns_netmask, ns_hostmask;
74 static u_short allones[] = {-1, -1, -1};
76 struct nspcb nsrawpcb;
81 static void nsintr(struct netmsg *msg);
86 ns_broadhost = * (union ns_host *) allones;
87 ns_broadnet = * (union ns_net *) allones;
88 nspcb.nsp_next = nspcb.nsp_prev = &nspcb;
89 nsrawpcb.nsp_next = nsrawpcb.nsp_prev = &nsrawpcb;
91 ns_netmask.sns_len = 6;
92 ns_netmask.sns_addr.x_net = ns_broadnet;
93 ns_hostmask.sns_len = 12;
94 ns_hostmask.sns_addr.x_net = ns_broadnet;
95 ns_hostmask.sns_addr.x_host = ns_broadhost;
96 netisr_register(NETISR_NS, cpu0_portfn, nsintr);
100 * Idp input routine. Pass to next level.
102 int nsintr_getpck = 0;
103 int nsintr_swtch = 0;
106 nsintr(struct netmsg *msg)
108 struct mbuf *m = ((struct netmsg_packet *)msg)->nm_packet;
116 * Get IDP header in first mbuf.
119 if ((m->m_flags & M_EXT || m->m_len < sizeof (struct idp)) &&
120 (m = m_pullup(m, sizeof (struct idp))) == 0) {
121 idpstat.idps_toosmall++;
126 * Give any raw listeners a crack at the packet
128 for (nsp = nsrawpcb.nsp_next; nsp != &nsrawpcb; nsp = nsp->nsp_next) {
129 struct mbuf *m1 = m_copy(m, 0, (int)M_COPYALL);
130 if (m1) idp_input(m1, nsp);
133 idp = mtod(m, struct idp *);
134 len = ntohs(idp->idp_len);
135 if ((oddpacketp = (len & 1))) {
136 len++; /* If this packet is of odd length,
137 preserve garbage byte for checksum */
141 * Check that the amount of data in the buffers
142 * is as at least much as the IDP header would have us expect.
143 * Trim mbufs if longer than we expect.
144 * Drop packet if shorter than we expect.
146 if (m->m_pkthdr.len < len) {
147 idpstat.idps_tooshort++;
150 if (m->m_pkthdr.len > len) {
151 if (m->m_len == m->m_pkthdr.len) {
153 m->m_pkthdr.len = len;
155 m_adj(m, len - m->m_pkthdr.len);
157 if (idpcksum && ((i = idp->idp_sum)!=0xffff)) {
159 if (i != (idp->idp_sum = ns_cksum(m, len))) {
160 idpstat.idps_badsum++;
162 if (ns_hosteqnh(ns_thishost, idp->idp_dna.x_host))
163 error = NS_ERR_BADSUM;
165 error = NS_ERR_BADSUM_T;
166 ns_error(m, error, 0);
171 * Is this a directed broadcast?
173 if (ns_hosteqnh(ns_broadhost,idp->idp_dna.x_host)) {
174 if ((!ns_neteq(idp->idp_dna, idp->idp_sna)) &&
175 (!ns_neteqnn(idp->idp_dna.x_net, ns_broadnet)) &&
176 (!ns_neteqnn(idp->idp_sna.x_net, ns_zeronet)) &&
177 (!ns_neteqnn(idp->idp_dna.x_net, ns_zeronet)) ) {
179 * Look to see if I need to eat this packet.
180 * Algorithm is to forward all young packets
181 * and prematurely age any packets which will
182 * by physically broadcasted.
183 * Any very old packets eaten without forwarding
186 * Suggestion of Bill Nesheim, Cornell U.
188 if (idp->idp_tc < NS_MAXHOPS) {
194 * Is this our packet? If not, forward.
196 } else if (!ns_hosteqnh(ns_thishost,idp->idp_dna.x_host)) {
201 * Locate pcb for datagram.
203 nsp = ns_pcblookup(&idp->idp_sna, idp->idp_dna.x_port, NS_WILDCARD);
205 * Switch out to protocol's input routine.
212 if ((nsp->nsp_flags & NSP_ALL_PACKETS)==0)
213 switch (idp->idp_pt) {
225 ns_error(m, NS_ERR_NOSOCK, 0);
234 u_char nsctlerrmap[PRC_NCMDS] = {
235 ECONNABORTED, ECONNABORTED, 0, 0,
236 0, 0, EHOSTDOWN, EHOSTUNREACH,
237 ENETUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
242 int idp_donosocks = 1;
245 idp_ctlinput(cmd, arg)
251 struct ns_errp *errp = (struct ns_errp *)arg; /* XXX */
254 if (cmd < 0 || cmd > PRC_NCMDS)
256 if (nsctlerrmap[cmd] == 0)
258 type = NS_ERR_UNREACH_HOST;
260 struct sockaddr_ns *sns;
264 case PRC_HOSTUNREACH:
265 sns = (struct sockaddr_ns *)arg;
266 if (sns->sns_family != AF_NS)
272 errp = (struct ns_errp *)arg;
273 ns = &errp->ns_err_idp.idp_dna;
274 type = errp->ns_err_num;
275 type = ntohs((u_short)type);
279 case NS_ERR_UNREACH_HOST:
280 ns_pcbnotify(ns, (int)nsctlerrmap[cmd], idp_abort, (long)0);
284 nsp = ns_pcblookup(ns, errp->ns_err_idp.idp_sna.x_port,
286 if(nsp && idp_donosocks && ! ns_nullhost(nsp->nsp_faddr))
287 (void) idp_drop(nsp, (int)nsctlerrmap[cmd]);
292 int idpforwarding = 1;
294 * Forward a packet. If some error occurs return the sender
295 * an error packet. Note we can't always generate a meaningful
296 * error message because the NS errors don't have a large enough repetoire
297 * of codes and types.
299 struct route idp_droute;
300 struct route idp_sroute;
306 struct idp *idp = mtod(m, struct idp *);
307 int error, type, code;
308 struct mbuf *mcopy = NULL;
310 int flags = NS_FORWARDING;
315 printf("forward: src ");
316 ns_printhost(&idp->idp_sna);
318 ns_printhost(&idp->idp_dna);
319 printf("hop count %d\n", idp->idp_tc);
321 if (idpforwarding == 0) {
322 /* can't tell difference between net and host */
323 type = NS_ERR_UNREACH_HOST, code = 0;
327 if (idp->idp_tc > NS_MAXHOPS) {
328 type = NS_ERR_TOO_OLD, code = 0;
332 * Save at most 42 bytes of the packet in case
333 * we need to generate an NS error message to the src.
335 mcopy = m_copy(m, 0, imin((int)ntohs(idp->idp_len), 42));
337 if ((ok_there = idp_do_route(&idp->idp_dna,&idp_droute))==0) {
338 type = NS_ERR_UNREACH_HOST, code = 0;
342 * Here we think about forwarding broadcast packets,
343 * so we try to insure that it doesn't go back out
344 * on the interface it came in on. Also, if we
345 * are going to physically broadcast this, let us
346 * age the packet so we can eat it safely the second time around.
348 if (idp->idp_dna.x_host.c_host[0] & 0x1) {
349 struct ns_ifaddr *ia = ns_iaonnetof(&idp->idp_dna);
352 /* I'm gonna hafta eat this packet */
353 agedelta += NS_MAXHOPS - idp->idp_tc;
354 idp->idp_tc = NS_MAXHOPS;
356 if ((ok_back = idp_do_route(&idp->idp_sna,&idp_sroute))==0) {
357 /* error = ENETUNREACH; He'll never get it! */
361 if (idp_droute.ro_rt &&
362 (ifp=idp_droute.ro_rt->rt_ifp) &&
364 (ifp!=idp_sroute.ro_rt->rt_ifp)) {
365 flags |= NS_ALLOWBROADCAST;
367 type = NS_ERR_UNREACH_HOST, code = 0;
371 /* need to adjust checksum */
372 if (idp->idp_sum!=0xffff) {
379 x.l = 0; x.c[0] = agedelta;
380 shift = (((((int)ntohs(idp->idp_len))+1)>>1)-2) & 0xf;
381 x.l = idp->idp_sum + (x.s[0] << shift);
382 x.l = x.s[0] + x.s[1];
383 x.l = x.s[0] + x.s[1];
384 if (x.l==0xffff) idp->idp_sum = 0; else idp->idp_sum = x.l;
386 if ((error = ns_output(m, &idp_droute, flags)) &&
388 idp = mtod(mcopy, struct idp *);
389 type = NS_ERR_UNSPEC_T, code = 0;
397 type = NS_ERR_UNREACH_HOST;
401 type = NS_ERR_TOO_BIG;
402 code = 576; /* too hard to figure out mtu here */
406 type = NS_ERR_UNSPEC_T;
411 ns_error(m, type, code);
415 idp_undo_route(&idp_droute);
417 idp_undo_route(&idp_sroute);
423 idp_do_route(src, ro)
428 struct sockaddr_ns *dst;
430 bzero((caddr_t)ro, sizeof (*ro));
431 dst = (struct sockaddr_ns *)&ro->ro_dst;
433 dst->sns_len = sizeof(*dst);
434 dst->sns_family = AF_NS;
435 dst->sns_addr = *src;
436 dst->sns_addr.x_port = 0;
438 if (ro->ro_rt == 0 || ro->ro_rt->rt_ifp == 0) {
449 if (ro->ro_rt) {RTFREE(ro->ro_rt);}
453 ns_watch_output(m, ifp)
460 * Give any raw listeners a crack at the packet
462 for (nsp = nsrawpcb.nsp_next; nsp != &nsrawpcb; nsp = nsp->nsp_next) {
463 struct mbuf *m0 = m_copy(m, 0, (int)M_COPYALL);
467 M_PREPEND(m0, sizeof (*idp), M_DONTWAIT);
470 idp = mtod(m0, struct idp *);
471 idp->idp_sna.x_net = ns_zeronet;
472 idp->idp_sna.x_host = ns_thishost;
473 if (ifp && (ifp->if_flags & IFF_POINTOPOINT))
474 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
475 if (ifa->ifa_addr->sa_family==AF_NS) {
476 idp->idp_sna = IA_SNS(ifa)->sns_addr;
479 idp->idp_len = ntohl(m0->m_pkthdr.len);