NetBSD/sys/netatalk/ddp_output.c

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/* $NetBSD: ddp_output.c,v 1.4 2001/11/15 09:48:26 lukem Exp $ */
/*
* Copyright (c) 1990,1991 Regents of The University of Michigan.
* All Rights Reserved.
*
* Permission to use, copy, modify, and distribute this software and
* its documentation for any purpose and without fee is hereby granted,
* provided that the above copyright notice appears in all copies and
* that both that copyright notice and this permission notice appear
* in supporting documentation, and that the name of The University
* of Michigan not be used in advertising or publicity pertaining to
* distribution of the software without specific, written prior
* permission. This software is supplied as is without expressed or
* implied warranties of any kind.
*
* This product includes software developed by the University of
* California, Berkeley and its contributors.
*
* Research Systems Unix Group
* The University of Michigan
* c/o Wesley Craig
* 535 W. William Street
* Ann Arbor, Michigan
* +1-313-764-2278
* netatalk@umich.edu
*/
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#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: ddp_output.c,v 1.4 2001/11/15 09:48:26 lukem Exp $");
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#include <sys/param.h>
#include <sys/systm.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/errno.h>
#include <sys/syslog.h>
#include <net/if.h>
#include <net/route.h>
#include <net/if_ether.h>
#include <netinet/in.h>
#undef s_net
#include <netatalk/at.h>
#include <netatalk/at_var.h>
#include <netatalk/ddp.h>
#include <netatalk/ddp_var.h>
#include <netatalk/at_extern.h>
#include <machine/stdarg.h>
int ddp_cksum = 1;
int
#if __STDC__
ddp_output(struct mbuf *m,...)
#else
ddp_output(va_alist)
va_dcl
#endif
{
struct ddpcb *ddp;
struct ddpehdr *deh;
va_list ap;
#if __STDC__
va_start(ap, m);
#else
struct mbuf *m;
va_start(ap);
m = va_arg(ap, struct mbuf *);
#endif
ddp = va_arg(ap, struct ddpcb *);
va_end(ap);
M_PREPEND(m, sizeof(struct ddpehdr), M_WAIT);
deh = mtod(m, struct ddpehdr *);
deh->deh_pad = 0;
deh->deh_hops = 0;
deh->deh_len = m->m_pkthdr.len;
deh->deh_dnet = ddp->ddp_fsat.sat_addr.s_net;
deh->deh_dnode = ddp->ddp_fsat.sat_addr.s_node;
deh->deh_dport = ddp->ddp_fsat.sat_port;
deh->deh_snet = ddp->ddp_lsat.sat_addr.s_net;
deh->deh_snode = ddp->ddp_lsat.sat_addr.s_node;
deh->deh_sport = ddp->ddp_lsat.sat_port;
/*
* The checksum calculation is done after all of the other bytes have
* been filled in.
*/
if (ddp_cksum) {
deh->deh_sum = at_cksum(m, sizeof(int));
} else {
deh->deh_sum = 0;
}
deh->deh_bytes = htonl(deh->deh_bytes);
return (ddp_route(m, &ddp->ddp_route));
}
u_short
at_cksum(m, skip)
struct mbuf *m;
int skip;
{
u_char *data, *end;
u_long cksum = 0;
for (; m; m = m->m_next) {
for (data = mtod(m, u_char *), end = data + m->m_len;
data < end; data++) {
if (skip) {
skip--;
continue;
}
cksum = (cksum + *data) << 1;
if (cksum & 0x00010000) {
cksum++;
}
cksum &= 0x0000ffff;
}
}
if (cksum == 0) {
cksum = 0x0000ffff;
}
return ((u_short) cksum);
}
int
ddp_route(m, ro)
struct mbuf *m;
struct route *ro;
{
struct sockaddr_at gate;
struct elaphdr *elh;
struct mbuf *m0;
struct at_ifaddr *aa = NULL;
struct ifnet *ifp = NULL;
u_short net;
if (ro->ro_rt && (ifp = ro->ro_rt->rt_ifp)) {
net = satosat(ro->ro_rt->rt_gateway)->sat_addr.s_net;
for (aa = at_ifaddr.tqh_first; aa; aa = aa->aa_list.tqe_next) {
if (aa->aa_ifp == ifp &&
ntohs(net) >= ntohs(aa->aa_firstnet) &&
ntohs(net) <= ntohs(aa->aa_lastnet)) {
break;
}
}
}
if (aa == NULL) {
printf("ddp_route: oops\n");
m_freem(m);
return (EINVAL);
}
/*
* There are several places in the kernel where data is added to
* an mbuf without ensuring that the mbuf pointer is aligned.
* This is bad for transition routing, since phase 1 and phase 2
* packets end up poorly aligned due to the three byte elap header.
*/
if (!(aa->aa_flags & AFA_PHASE2)) {
MGET(m0, M_WAIT, MT_HEADER);
if (m0 == 0) {
m_freem(m);
printf("ddp_route: no buffers\n");
return (ENOBUFS);
}
m0->m_next = m;
/* XXX perhaps we ought to align the header? */
m0->m_len = SZ_ELAPHDR;
m = m0;
elh = mtod(m, struct elaphdr *);
elh->el_snode = satosat(&aa->aa_addr)->sat_addr.s_node;
elh->el_type = ELAP_DDPEXTEND;
if (ntohs(satosat(&ro->ro_dst)->sat_addr.s_net) >=
ntohs(aa->aa_firstnet) &&
ntohs(satosat(&ro->ro_dst)->sat_addr.s_net) <=
ntohs(aa->aa_lastnet)) {
elh->el_dnode = satosat(&ro->ro_dst)->sat_addr.s_node;
} else {
elh->el_dnode =
satosat(ro->ro_rt->rt_gateway)->sat_addr.s_node;
}
}
if (ntohs(satosat(&ro->ro_dst)->sat_addr.s_net) >=
ntohs(aa->aa_firstnet) &&
ntohs(satosat(&ro->ro_dst)->sat_addr.s_net) <=
ntohs(aa->aa_lastnet)) {
gate = *satosat(&ro->ro_dst);
} else {
gate = *satosat(ro->ro_rt->rt_gateway);
}
ro->ro_rt->rt_use++;
#if IFA_STATS
aa->aa_ifa.ifa_data.ifad_outbytes += m->m_pkthdr.len;
#endif
/* XXX */
return ((*ifp->if_output) (ifp, m, (struct sockaddr *) &gate, NULL));
}