2 * Copyright (c) 1990,1994 Regents of The University of Michigan.
3 * All Rights Reserved. See COPYRIGHT.
5 * $FreeBSD: src/sys/netatalk/ddp_input.c,v 1.12 2000/02/13 03:31:58 peter Exp $
6 * $DragonFly: src/sys/netproto/atalk/ddp_input.c,v 1.14 2007/05/23 08:57:06 dillon Exp $
10 #include <sys/systm.h>
11 #include <sys/kernel.h>
13 #include <sys/socket.h>
14 #include <sys/socketvar.h>
16 #include <sys/thread2.h>
17 #include <sys/msgport2.h>
20 #include <net/netisr.h>
21 #include <net/route.h>
22 #include <net/intrq.h>
28 #include "at_extern.h"
30 static volatile int ddp_forward = 1;
31 static volatile int ddp_firewall = 0;
32 static struct ddpstat ddpstat;
33 static struct route forwro;
35 const int atintrq1_present = 1, atintrq2_present = 1;
37 static void ddp_input(struct mbuf *, struct ifnet *, struct elaphdr *, int);
40 * Could probably merge these two code segments a little better...
43 at2intr(struct netmsg *msg)
45 struct mbuf *m = ((struct netmsg_packet *)msg)->nm_packet;
48 * Phase 2 packet handling
50 ddp_input(m, m->m_pkthdr.rcvif, NULL, 2);
51 /* msg was embedded in the mbuf, do not reply! */
55 at1intr(struct netmsg *msg)
57 struct mbuf *m = ((struct netmsg_packet *)msg)->nm_packet;
58 struct elaphdr *elhp, elh;
61 * Phase 1 packet handling
63 if (m->m_len < SZ_ELAPHDR && ((m = m_pullup(m, SZ_ELAPHDR)) == 0)) {
64 ddpstat.ddps_tooshort++;
69 * This seems a little dubious, but I don't know phase 1 so leave it.
71 elhp = mtod(m, struct elaphdr *);
74 if (elhp->el_type == ELAP_DDPEXTEND) {
75 ddp_input(m, m->m_pkthdr.rcvif, NULL, 1);
77 bcopy((caddr_t)elhp, (caddr_t)&elh, SZ_ELAPHDR);
78 ddp_input(m, m->m_pkthdr.rcvif, &elh, 1);
82 /* msg was embedded in the mbuf, do not reply! */
86 ddp_input(struct mbuf *m, struct ifnet *ifp, struct elaphdr *elh, int phase)
88 struct sockaddr_at from, to;
89 struct ddpshdr *dsh, ddps;
91 struct ddpehdr *deh = NULL, ddpe;
96 bzero( (caddr_t)&from, sizeof( struct sockaddr_at ));
97 bzero( (caddr_t)&to, sizeof( struct sockaddr_at ));
100 * Extract the information in the short header.
101 * netowrk information is defaulted to ATADDR_ANYNET
102 * and node information comes from the elh info.
103 * We must be phase 1.
105 ddpstat.ddps_short++;
107 if ( m->m_len < sizeof( struct ddpshdr ) &&
108 (( m = m_pullup( m, sizeof( struct ddpshdr ))) == 0 )) {
109 ddpstat.ddps_tooshort++;
113 dsh = mtod( m, struct ddpshdr *);
114 bcopy( (caddr_t)dsh, (caddr_t)&ddps, sizeof( struct ddpshdr ));
115 ddps.dsh_bytes = ntohl( ddps.dsh_bytes );
118 to.sat_addr.s_net = ATADDR_ANYNET;
119 to.sat_addr.s_node = elh->el_dnode;
120 to.sat_port = ddps.dsh_dport;
121 from.sat_addr.s_net = ATADDR_ANYNET;
122 from.sat_addr.s_node = elh->el_snode;
123 from.sat_port = ddps.dsh_sport;
126 * Make sure that we point to the phase1 ifaddr info
127 * and that it's valid for this packet.
129 for ( aa = at_ifaddr; aa; aa = aa->aa_next ) {
130 if ( (aa->aa_ifp == ifp)
131 && ( (aa->aa_flags & AFA_PHASE2) == 0)
132 && ( (to.sat_addr.s_node == AA_SAT( aa )->sat_addr.s_node)
133 || (to.sat_addr.s_node == ATADDR_BCAST))) {
138 * maybe we got a broadcast not meant for us.. ditch it.
146 * There was no 'elh' passed on. This could still be
147 * either phase1 or phase2.
148 * We have a long header, but we may be running on a phase 1 net.
149 * Extract out all the info regarding this packet's src & dst.
153 if ( m->m_len < sizeof( struct ddpehdr ) &&
154 (( m = m_pullup( m, sizeof( struct ddpehdr ))) == 0 )) {
155 ddpstat.ddps_tooshort++;
159 deh = mtod( m, struct ddpehdr *);
160 bcopy( (caddr_t)deh, (caddr_t)&ddpe, sizeof( struct ddpehdr ));
161 ddpe.deh_bytes = ntohl( ddpe.deh_bytes );
164 if (( cksum = ddpe.deh_sum ) == 0 ) {
165 ddpstat.ddps_nosum++;
168 from.sat_addr.s_net = ddpe.deh_snet;
169 from.sat_addr.s_node = ddpe.deh_snode;
170 from.sat_port = ddpe.deh_sport;
171 to.sat_addr.s_net = ddpe.deh_dnet;
172 to.sat_addr.s_node = ddpe.deh_dnode;
173 to.sat_port = ddpe.deh_dport;
175 if ( to.sat_addr.s_net == ATADDR_ANYNET ) {
177 * The TO address doesn't specify a net,
178 * So by definition it's for this net.
179 * Try find ifaddr info with the right phase,
180 * the right interface, and either to our node, a broadcast,
181 * or looped back (though that SHOULD be covered in the other
184 * XXX If we have multiple interfaces, then the first with
185 * this node number will match (which may NOT be what we want,
186 * but it's probably safe in 99.999% of cases.
188 for ( aa = at_ifaddr; aa; aa = aa->aa_next ) {
189 if ( phase == 1 && ( aa->aa_flags & AFA_PHASE2 )) {
192 if ( phase == 2 && ( aa->aa_flags & AFA_PHASE2 ) == 0 ) {
195 if ( (aa->aa_ifp == ifp)
196 && ( (to.sat_addr.s_node == AA_SAT( aa )->sat_addr.s_node)
197 || (to.sat_addr.s_node == ATADDR_BCAST)
198 || (ifp->if_flags & IFF_LOOPBACK))) {
204 * A destination network was given. We just try to find
205 * which ifaddr info matches it.
207 for ( aa = at_ifaddr; aa; aa = aa->aa_next ) {
209 * This is a kludge. Accept packets that are
210 * for any router on a local netrange.
212 if ( to.sat_addr.s_net == aa->aa_firstnet &&
213 to.sat_addr.s_node == 0 ) {
217 * Don't use ifaddr info for which we are totally outside the
218 * netrange, and it's not a startup packet.
219 * Startup packets are always implicitly allowed on to
222 if ((( ntohs( to.sat_addr.s_net ) < ntohs( aa->aa_firstnet ))
223 || (ntohs( to.sat_addr.s_net ) > ntohs( aa->aa_lastnet )))
224 && (( ntohs( to.sat_addr.s_net ) < 0xff00)
225 || (ntohs( to.sat_addr.s_net ) > 0xfffe ))) {
230 * Don't record a match either if we just don't have a match
231 * in the node address. This can have if the interface
232 * is in promiscuous mode for example.
234 if (( to.sat_addr.s_node != AA_SAT( aa )->sat_addr.s_node)
235 && (to.sat_addr.s_node != ATADDR_BCAST) ) {
244 * Adjust the length, removing any padding that may have been added
245 * at a link layer. We do this before we attempt to forward a packet,
246 * possibly on a different media.
248 mlen = m->m_pkthdr.len;
250 ddpstat.ddps_toosmall++;
255 m_adj( m, dlen - mlen );
259 * If it aint for a net on any of our interfaces,
260 * or it IS for a net on a different interface than it came in on,
261 * (and it is not looped back) then consider if we should forward it.
262 * As we are not really a router this is a bit cheeky, but it may be
266 || ( (to.sat_addr.s_node == ATADDR_BCAST)
267 && (aa->aa_ifp != ifp)
268 && (( ifp->if_flags & IFF_LOOPBACK ) == 0 ))) {
270 * If we've explicitly disabled it, don't route anything
272 if ( ddp_forward == 0 ) {
277 * If the cached forwarding route is still valid, use it.
280 && ( satosat(&forwro.ro_dst)->sat_addr.s_net != to.sat_addr.s_net
281 || satosat(&forwro.ro_dst)->sat_addr.s_node != to.sat_addr.s_node )) {
282 RTFREE( forwro.ro_rt );
283 forwro.ro_rt = (struct rtentry *)0;
287 * If we don't have a cached one (any more) or it's useless,
288 * Then get a new route.
289 * XXX this could cause a 'route leak'. check this!
291 if ( forwro.ro_rt == (struct rtentry *)0
292 || forwro.ro_rt->rt_ifp == (struct ifnet *)0 ) {
293 forwro.ro_dst.sa_len = sizeof( struct sockaddr_at );
294 forwro.ro_dst.sa_family = AF_APPLETALK;
295 satosat(&forwro.ro_dst)->sat_addr.s_net = to.sat_addr.s_net;
296 satosat(&forwro.ro_dst)->sat_addr.s_node = to.sat_addr.s_node;
301 * If it's not going to get there on this hop, and it's
302 * already done too many hops, then throw it away.
304 if ( (to.sat_addr.s_net != satosat( &forwro.ro_dst )->sat_addr.s_net)
305 && (ddpe.deh_hops == DDP_MAXHOPS) ) {
311 * A ddp router might use the same interface
312 * to forward the packet, which this would not effect.
313 * Don't allow packets to cross from one interface to another however.
316 && ( (forwro.ro_rt == NULL)
317 || (forwro.ro_rt->rt_ifp != ifp))) {
324 * If it was a short header then it would have not gotten here,
325 * so we can assume there is room to drop the header in.
326 * XXX what about promiscuous mode, etc...
329 ddpe.deh_bytes = htonl( ddpe.deh_bytes );
330 bcopy( (caddr_t)&ddpe, (caddr_t)deh, sizeof( u_short )); /* XXX deh? */
331 if ( ddp_route( m, &forwro )) {
332 ddpstat.ddps_cantforward++;
334 ddpstat.ddps_forward++;
340 * It was for us, and we have an ifaddr to use with it.
342 from.sat_len = sizeof( struct sockaddr_at );
343 from.sat_family = AF_APPLETALK;
346 * We are no longer interested in the link layer.
350 m_adj( m, sizeof( struct ddpshdr ));
352 if ( ddp_cksum && cksum && cksum != at_cksum( m, sizeof( int ))) {
353 ddpstat.ddps_badsum++;
357 m_adj( m, sizeof( struct ddpehdr ));
361 * Search for ddp protocol control blocks that match these
364 if (( ddp = ddp_search( &from, &to, aa )) == NULL ) {
370 * If we found one, deliver th epacket to the socket
372 if (ssb_appendaddr( &ddp->ddp_socket->so_rcv, (struct sockaddr *)&from,
373 m, (struct mbuf *)0 ) == 0 ) {
375 * If the socket is full (or similar error) dump the packet.
377 ddpstat.ddps_nosockspace++;
382 * And wake up whatever might be waiting for it
384 sorwakeup( ddp->ddp_socket );
388 /* As if we haven't got enough of this sort of think floating
389 around the kernel :) */
394 char hexdig[] = "0123456789ABCDEF";
397 bprint(char *data, int len)
399 char xout[ BPXLEN ], aout[ BPALEN ];
402 bzero( xout, BPXLEN );
403 bzero( aout, BPALEN );
408 kprintf( "%s\t%s\n", xout, aout );
410 kprintf( "%s\n", "(end)" );
414 xout[ (i*3) ] = hexdig[ ( *data & 0xf0 ) >> 4 ];
415 xout[ (i*3) + 1 ] = hexdig[ *data & 0x0f ];
417 if ( (u_char)*data < 0x7f && (u_char)*data > 0x20 ) {
423 xout[ (i*3) + 2 ] = ' ';
429 if ( i > BPALEN - 2 ) {
430 kprintf( "%s\t%s\n", xout, aout );
431 bzero( xout, BPXLEN );
432 bzero( aout, BPALEN );
440 m_printm(struct mbuf *m)
442 for (; m; m = m->m_next ) {
443 bprint( mtod( m, char * ), m->m_len );