2 * Copyright (c) 1990,1991 Regents of The University of Michigan.
5 * Permission to use, copy, modify, and distribute this software and
6 * its documentation for any purpose and without fee is hereby granted,
7 * provided that the above copyright notice appears in all copies and
8 * that both that copyright notice and this permission notice appear
9 * in supporting documentation, and that the name of The University
10 * of Michigan not be used in advertising or publicity pertaining to
11 * distribution of the software without specific, written prior
12 * permission. This software is supplied as is without expressed or
13 * implied warranties of any kind.
15 * Research Systems Unix Group
16 * The University of Michigan
18 * 535 W. William Street
21 * netatalk@itd.umich.edu
26 #include <sys/param.h>
27 #include <sys/systm.h>
29 #include <sys/socket.h>
30 #include <sys/socketvar.h>
33 #include <net/route.h>
37 #include <netatalk/at.h>
38 #include <netatalk/at_var.h>
39 #include <netatalk/ddp.h>
40 #include <netatalk/ddp_var.h>
41 #include <netatalk/at_extern.h>
46 ddp_output( struct mbuf *m, struct socket *so)
49 struct ddpcb *ddp = sotoddpcb( so );
51 M_PREPEND( m, sizeof( struct ddpehdr ), M_TRYWAIT );
53 deh = mtod( m, struct ddpehdr *);
57 deh->deh_len = m->m_pkthdr.len;
59 deh->deh_dnet = ddp->ddp_fsat.sat_addr.s_net;
60 deh->deh_dnode = ddp->ddp_fsat.sat_addr.s_node;
61 deh->deh_dport = ddp->ddp_fsat.sat_port;
62 deh->deh_snet = ddp->ddp_lsat.sat_addr.s_net;
63 deh->deh_snode = ddp->ddp_lsat.sat_addr.s_node;
64 deh->deh_sport = ddp->ddp_lsat.sat_port;
67 * The checksum calculation is done after all of the other bytes have
71 deh->deh_sum = at_cksum( m, sizeof( int ));
75 deh->deh_bytes = htonl( deh->deh_bytes );
78 printf ("ddp_output: from %d.%d:%d to %d.%d:%d\n",
79 ntohs(deh->deh_snet), deh->deh_snode, deh->deh_sport,
80 ntohs(deh->deh_dnet), deh->deh_dnode, deh->deh_dport);
82 return( ddp_route( m, &ddp->ddp_route ));
86 at_cksum( struct mbuf *m, int skip)
91 for (; m; m = m->m_next ) {
92 for ( data = mtod( m, u_char * ), end = data + m->m_len; data < end;
98 cksum = ( cksum + *data ) << 1;
99 if ( cksum & 0x00010000 ) {
109 return( (u_short)cksum );
113 ddp_route( struct mbuf *m, struct route *ro)
115 struct sockaddr_at gate;
118 struct at_ifaddr *aa = NULL;
119 struct ifnet *ifp = NULL;
123 /* Check for net zero, node zero ("myself") */
124 if (satosat(&ro->ro_dst)->sat_addr.s_net == ATADDR_ANYNET
125 && satosat(&ro->ro_dst)->sat_addr.s_node == ATADDR_ANYNODE) {
126 /* Find the loopback interface */
131 * if we have a route, find the ifa that refers to this route.
132 * I.e The ifa used to get to the gateway.
134 if ( (ro->ro_rt == NULL)
135 || ( ro->ro_rt->rt_ifa == NULL )
136 || ( (ifp = ro->ro_rt->rt_ifa->ifa_ifp) == NULL )) {
139 if ( (ro->ro_rt != NULL)
140 && ( ro->ro_rt->rt_ifa )
141 && ( ifp = ro->ro_rt->rt_ifa->ifa_ifp )) {
142 net = ntohs(satosat(ro->ro_rt->rt_gateway)->sat_addr.s_net);
143 for ( aa = at_ifaddr; aa; aa = aa->aa_next ) {
144 if (((net == 0) || (aa->aa_ifp == ifp)) &&
145 net >= ntohs( aa->aa_firstnet ) &&
146 net <= ntohs( aa->aa_lastnet )) {
152 #ifdef NETATALK_DEBUG
153 if (ro->ro_rt == NULL)
154 printf ("ddp_route: no ro_rt.\n");
155 else if (ro->ro_rt->rt_ifa == NULL)
156 printf ("ddp_route: no ro_rt->rt_ifa\n");
158 printf ("ddp_route: no ro_rt->rt_ifa->ifa_ifp\n");
160 return( ENETUNREACH );
164 #ifdef NETATALK_DEBUG
165 printf( "ddp_route: no atalk address found for %s%d\n",
166 ifp->if_name, ifp->if_unit);
169 return( ENETUNREACH );
173 * if the destination address is on a directly attached node use that,
174 * else use the official gateway.
176 if ( ntohs( satosat( &ro->ro_dst )->sat_addr.s_net ) >=
177 ntohs( aa->aa_firstnet ) &&
178 ntohs( satosat( &ro->ro_dst )->sat_addr.s_net ) <=
179 ntohs( aa->aa_lastnet )) {
180 gate = *satosat( &ro->ro_dst );
182 gate = *satosat( ro->ro_rt->rt_gateway );
186 * There are several places in the kernel where data is added to
187 * an mbuf without ensuring that the mbuf pointer is aligned.
188 * This is bad for transition routing, since phase 1 and phase 2
189 * packets end up poorly aligned due to the three byte elap header.
191 if ( !(aa->aa_flags & AFA_PHASE2) ) {
192 MGET( m0, M_TRYWAIT, MT_HEADER );
195 printf("ddp_route: no buffers\n");
199 /* XXX perhaps we ought to align the header? */
200 m0->m_len = SZ_ELAPHDR;
203 elh = mtod( m, struct elaphdr *);
204 elh->el_snode = satosat( &aa->aa_addr )->sat_addr.s_node;
205 elh->el_type = ELAP_DDPEXTEND;
206 elh->el_dnode = gate.sat_addr.s_node;
210 #ifdef NETATALK_DEBUG
211 printf ("ddp_route: from %d.%d to %d.%d, via %d.%d (%s%d)\n",
212 ntohs(satosat(&aa->aa_addr)->sat_addr.s_net),
213 satosat(&aa->aa_addr)->sat_addr.s_node,
214 ntohs(satosat(&ro->ro_dst)->sat_addr.s_net),
215 satosat(&ro->ro_dst)->sat_addr.s_node,
216 ntohs(gate.sat_addr.s_net),
217 gate.sat_addr.s_node,
218 ifp->if_name, ifp->if_unit);
221 /* short-circuit the output if we're sending this to ourself */
222 if ((satosat(&aa->aa_addr)->sat_addr.s_net == satosat(&ro->ro_dst)->sat_addr.s_net) &&
223 (satosat(&aa->aa_addr)->sat_addr.s_node == satosat(&ro->ro_dst)->sat_addr.s_node))
225 return (if_simloop(ifp, m, gate.sat_family, 0));
228 return((*ifp->if_output)( ifp,
229 m, (struct sockaddr *)&gate, NULL)); /* XXX */