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
24 /* $FreeBSD: src/sys/netatalk/ddp_output.c,v 1.13.6.1 2000/06/02 22:39:07 archie Exp $ */
25 /* $DragonFly: src/sys/netproto/atalk/ddp_output.c,v 1.7 2004/06/03 15:04:51 joerg Exp $ */
27 #include <sys/param.h>
28 #include <sys/systm.h>
30 #include <sys/socket.h>
31 #include <sys/socketvar.h>
34 #include <net/route.h>
42 #include "at_extern.h"
47 ddp_output(struct mbuf *m, struct socket *so, ...)
50 struct ddpcb *ddp = sotoddpcb( so );
52 M_PREPEND( m, sizeof( struct ddpehdr ), MB_WAIT );
56 deh = mtod( m, struct ddpehdr *);
60 deh->deh_len = m->m_pkthdr.len;
62 deh->deh_dnet = ddp->ddp_fsat.sat_addr.s_net;
63 deh->deh_dnode = ddp->ddp_fsat.sat_addr.s_node;
64 deh->deh_dport = ddp->ddp_fsat.sat_port;
65 deh->deh_snet = ddp->ddp_lsat.sat_addr.s_net;
66 deh->deh_snode = ddp->ddp_lsat.sat_addr.s_node;
67 deh->deh_sport = ddp->ddp_lsat.sat_port;
70 * The checksum calculation is done after all of the other bytes have
74 deh->deh_sum = at_cksum( m, sizeof( int ));
78 deh->deh_bytes = htonl( deh->deh_bytes );
81 printf ("ddp_output: from %d.%d:%d to %d.%d:%d\n",
82 ntohs(deh->deh_snet), deh->deh_snode, deh->deh_sport,
83 ntohs(deh->deh_dnet), deh->deh_dnode, deh->deh_dport);
85 return( ddp_route( m, &ddp->ddp_route ));
89 at_cksum( struct mbuf *m, int skip)
94 for (; m; m = m->m_next ) {
95 for ( data = mtod( m, u_char * ), end = data + m->m_len; data < end;
101 cksum = ( cksum + *data ) << 1;
102 if ( cksum & 0x00010000 ) {
112 return( (u_short)cksum );
116 ddp_route( struct mbuf *m, struct route *ro)
118 struct sockaddr_at gate;
121 struct at_ifaddr *aa = NULL;
122 struct ifnet *ifp = NULL;
126 /* Check for net zero, node zero ("myself") */
127 if (satosat(&ro->ro_dst)->sat_addr.s_net == ATADDR_ANYNET
128 && satosat(&ro->ro_dst)->sat_addr.s_node == ATADDR_ANYNODE) {
129 /* Find the loopback interface */
134 * if we have a route, find the ifa that refers to this route.
135 * I.e The ifa used to get to the gateway.
137 if ( (ro->ro_rt == NULL)
138 || ( ro->ro_rt->rt_ifa == NULL )
139 || ( (ifp = ro->ro_rt->rt_ifa->ifa_ifp) == NULL )) {
142 if ( (ro->ro_rt != NULL)
143 && ( ro->ro_rt->rt_ifa )
144 && ( ifp = ro->ro_rt->rt_ifa->ifa_ifp )) {
145 net = ntohs(satosat(ro->ro_rt->rt_gateway)->sat_addr.s_net);
146 for ( aa = at_ifaddr; aa; aa = aa->aa_next ) {
147 if (((net == 0) || (aa->aa_ifp == ifp)) &&
148 net >= ntohs( aa->aa_firstnet ) &&
149 net <= ntohs( aa->aa_lastnet )) {
155 #ifdef NETATALK_DEBUG
156 if (ro->ro_rt == NULL)
157 printf ("ddp_route: no ro_rt.\n");
158 else if (ro->ro_rt->rt_ifa == NULL)
159 printf ("ddp_route: no ro_rt->rt_ifa\n");
161 printf ("ddp_route: no ro_rt->rt_ifa->ifa_ifp\n");
163 return( ENETUNREACH );
167 #ifdef NETATALK_DEBUG
168 printf( "ddp_route: no atalk address found for %s\n",
172 return( ENETUNREACH );
176 * if the destination address is on a directly attached node use that,
177 * else use the official gateway.
179 if ( ntohs( satosat( &ro->ro_dst )->sat_addr.s_net ) >=
180 ntohs( aa->aa_firstnet ) &&
181 ntohs( satosat( &ro->ro_dst )->sat_addr.s_net ) <=
182 ntohs( aa->aa_lastnet )) {
183 gate = *satosat( &ro->ro_dst );
185 gate = *satosat( ro->ro_rt->rt_gateway );
189 * There are several places in the kernel where data is added to
190 * an mbuf without ensuring that the mbuf pointer is aligned.
191 * This is bad for transition routing, since phase 1 and phase 2
192 * packets end up poorly aligned due to the three byte elap header.
194 if ( !(aa->aa_flags & AFA_PHASE2) ) {
195 MGET( m0, MB_WAIT, MT_HEADER );
198 printf("ddp_route: no buffers\n");
202 /* XXX perhaps we ought to align the header? */
203 m0->m_len = SZ_ELAPHDR;
206 elh = mtod( m, struct elaphdr *);
207 elh->el_snode = satosat( &aa->aa_addr )->sat_addr.s_node;
208 elh->el_type = ELAP_DDPEXTEND;
209 elh->el_dnode = gate.sat_addr.s_node;
213 #ifdef NETATALK_DEBUG
214 printf ("ddp_route: from %d.%d to %d.%d, via %d.%d (%s)\n",
215 ntohs(satosat(&aa->aa_addr)->sat_addr.s_net),
216 satosat(&aa->aa_addr)->sat_addr.s_node,
217 ntohs(satosat(&ro->ro_dst)->sat_addr.s_net),
218 satosat(&ro->ro_dst)->sat_addr.s_node,
219 ntohs(gate.sat_addr.s_net),
220 gate.sat_addr.s_node,
224 /* short-circuit the output if we're sending this to ourself */
225 if ((satosat(&aa->aa_addr)->sat_addr.s_net == satosat(&ro->ro_dst)->sat_addr.s_net) &&
226 (satosat(&aa->aa_addr)->sat_addr.s_node == satosat(&ro->ro_dst)->sat_addr.s_node))
228 return (if_simloop(ifp, m, gate.sat_family, 0));
231 return((*ifp->if_output)( ifp,
232 m, (struct sockaddr *)&gate, NULL)); /* XXX */