freebsd-dev/sys/netiso/tuba_subr.c

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/*
* Copyright (c) 1992, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)tuba_subr.c 8.1 (Berkeley) 6/10/93
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* $Id: tuba_subr.c,v 1.2 1994/08/02 07:51:34 davidg Exp $
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*/
#include <sys/param.h>
#include <sys/proc.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/protosw.h>
#include <sys/errno.h>
#include <net/route.h>
#include <net/if.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/in_pcb.h>
#include <netinet/ip_var.h>
#include <netinet/ip_icmp.h>
#include <netinet/tcp.h>
#include <netinet/tcp_fsm.h>
#include <netinet/tcp_seq.h>
#include <netinet/tcp_timer.h>
#include <netinet/tcp_var.h>
#include <netinet/tcpip.h>
#include <netinet/tcp_debug.h>
#include <netiso/argo_debug.h>
#include <netiso/iso.h>
#include <netiso/clnp.h>
#include <netiso/iso_pcb.h>
#include <netiso/iso_var.h>
#include <netiso/tuba_table.h>
static struct sockaddr_iso null_siso = { sizeof(null_siso), AF_ISO, };
extern int tuba_table_size, tcp_keepidle, tcp_keepintvl, tcp_maxidle;
extern int tcppcbcachemiss, tcppredack, tcppreddat, tcprexmtthresh;
extern struct tcpiphdr tcp_saveti;
struct inpcb tuba_inpcb;
struct inpcb *tuba_last_inpcb = &tuba_inpcb;
struct isopcb tuba_isopcb;
/*
* Tuba initialization
*/
tuba_init()
{
#define TUBAHDRSIZE (3 /*LLC*/ + 9 /*CLNP Fixed*/ + 42 /*Addresses*/ \
+ 6 /*CLNP Segment*/ + 20 /*TCP*/)
tuba_inpcb.inp_next = tuba_inpcb.inp_prev = &tuba_inpcb;
tuba_isopcb.isop_next = tuba_isopcb.isop_prev = &tuba_isopcb;
tuba_isopcb.isop_faddr = &tuba_isopcb.isop_sfaddr;
tuba_isopcb.isop_laddr = &tuba_isopcb.isop_sladdr;
if (max_protohdr < TUBAHDRSIZE)
max_protohdr = TUBAHDRSIZE;
if (max_linkhdr + TUBAHDRSIZE > MHLEN)
panic("tuba_init");
}
struct addr_arg {
int error;
int offset;
u_long sum;
};
/*
* Calculate contribution to fudge factor for TCP checksum,
* and coincidentally set pointer for convenience of clnp_output
* if we are are responding when there is no isopcb around.
*/
static void
tuba_getaddr(arg, siso, index)
register struct addr_arg *arg;
struct sockaddr_iso **siso;
u_long index;
{
register struct tuba_cache *tc;
if (index <= tuba_table_size && (tc = tuba_table[index])) {
if (siso)
*siso = &tc->tc_siso;
arg->sum += (arg->offset & 1 ? tc->tc_ssum : tc->tc_sum)
+ (0xffff ^ index);
arg->offset += tc->tc_siso.siso_nlen + 1;
} else
arg->error = 1;
}
tuba_output(m, tp)
register struct mbuf *m;
struct tcpcb *tp;
{
register struct tcpiphdr *n;
struct isopcb *isop;
struct addr_arg arg;
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if (tp == 0 || (n = tp->t_template) == 0 ||
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(isop = (struct isopcb *)tp->t_tuba_pcb) == 0) {
isop = &tuba_isopcb;
n = mtod(m, struct tcpiphdr *);
arg.error = arg.sum = arg.offset = 0;
tuba_getaddr(&arg, &tuba_isopcb.isop_faddr, n->ti_dst.s_addr);
tuba_getaddr(&arg, &tuba_isopcb.isop_laddr, n->ti_src.s_addr);
REDUCE(arg.sum, arg.sum);
goto adjust;
}
if (n->ti_sum == 0) {
arg.error = arg.sum = arg.offset = 0;
tuba_getaddr(&arg, (struct sockaddr_iso **)0, n->ti_dst.s_addr);
tuba_getaddr(&arg, (struct sockaddr_iso **)0, n->ti_src.s_addr);
REDUCE(arg.sum, arg.sum);
n->ti_sum = arg.sum;
n = mtod(m, struct tcpiphdr *);
adjust:
if (arg.error) {
m_freem(m);
return (EADDRNOTAVAIL);
}
REDUCE(n->ti_sum, n->ti_sum + (0xffff ^ arg.sum));
}
m->m_len -= sizeof (struct ip);
m->m_pkthdr.len -= sizeof (struct ip);
m->m_data += sizeof (struct ip);
return (clnp_output(m, isop, m->m_pkthdr.len, 0));
}
tuba_refcnt(isop, delta)
struct isopcb *isop;
{
register struct tuba_cache *tc;
unsigned index, sum;
if (delta != 1)
delta = -1;
if (isop == 0 || isop->isop_faddr == 0 || isop->isop_laddr == 0 ||
(delta == -1 && isop->isop_tuba_cached == 0) ||
(delta == 1 && isop->isop_tuba_cached != 0))
return;
isop->isop_tuba_cached = (delta == 1);
if ((index = tuba_lookup(isop->isop_faddr, M_DONTWAIT)) != 0 &&
(tc = tuba_table[index]) != 0 && (delta == 1 || tc->tc_refcnt > 0))
tc->tc_refcnt += delta;
if ((index = tuba_lookup(isop->isop_laddr, M_DONTWAIT)) != 0 &&
(tc = tuba_table[index]) != 0 && (delta == 1 || tc->tc_refcnt > 0))
tc->tc_refcnt += delta;
}
tuba_pcbdetach(isop)
struct isopcb *isop;
{
if (isop == 0)
return;
tuba_refcnt(isop, -1);
isop->isop_socket = 0;
iso_pcbdetach(isop);
}
/*
* Avoid in_pcbconnect in faked out tcp_input()
*/
tuba_pcbconnect(inp, nam)
register struct inpcb *inp;
struct mbuf *nam;
{
register struct sockaddr_iso *siso;
struct sockaddr_in *sin = mtod(nam, struct sockaddr_in *);
struct tcpcb *tp = intotcpcb(inp);
struct isopcb *isop = (struct isopcb *)tp->t_tuba_pcb;
int error;
/* hardwire iso_pcbbind() here */
siso = isop->isop_laddr = &isop->isop_sladdr;
*siso = tuba_table[inp->inp_laddr.s_addr]->tc_siso;
siso->siso_tlen = sizeof(inp->inp_lport);
bcopy((caddr_t)&inp->inp_lport, TSEL(siso), sizeof(inp->inp_lport));
/* hardwire in_pcbconnect() here without assigning route */
inp->inp_fport = sin->sin_port;
inp->inp_faddr = sin->sin_addr;
/* reuse nam argument to call iso_pcbconnect() */
nam->m_len = sizeof(*siso);
siso = mtod(nam, struct sockaddr_iso *);
*siso = tuba_table[inp->inp_faddr.s_addr]->tc_siso;
siso->siso_tlen = sizeof(inp->inp_fport);
bcopy((caddr_t)&inp->inp_fport, TSEL(siso), sizeof(inp->inp_fport));
if ((error = iso_pcbconnect(isop, nam)) == 0)
tuba_refcnt(isop, 1);
return (error);
}
/*
* CALLED FROM:
* clnp's input routine, indirectly through the protosw.
* FUNCTION and ARGUMENTS:
* Take a packet (m) from clnp, strip off the clnp header
* and do tcp input processing.
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* No return value.
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*/
tuba_tcpinput(m, src, dst)
register struct mbuf *m;
struct sockaddr_iso *src, *dst;
{
unsigned long sum, lindex, findex;
register struct tcpiphdr *ti;
register struct inpcb *inp;
caddr_t optp = NULL;
int optlen;
int len, tlen, off;
register struct tcpcb *tp = 0;
int tiflags;
struct socket *so;
int todrop, acked, ourfinisacked, needoutput = 0;
short ostate;
struct in_addr laddr;
int dropsocket = 0, iss = 0;
u_long tiwin, ts_val, ts_ecr;
int ts_present = 0;
if ((m->m_flags & M_PKTHDR) == 0)
panic("tuba_tcpinput");
/*
* Do some housekeeping looking up CLNP addresses.
* If we are out of space might as well drop the packet now.
*/
tcpstat.tcps_rcvtotal++;
lindex = tuba_lookup(dst, M_DONTWAIT);
findex = tuba_lookup(src, M_DONTWAIT);
if (lindex == 0 || findex == 0)
goto drop;
/*
* CLNP gave us an mbuf chain WITH the clnp header pulled up,
* but the data pointer pushed past it.
*/
len = m->m_len;
tlen = m->m_pkthdr.len;
m->m_data -= sizeof(struct ip);
m->m_len += sizeof(struct ip);
m->m_pkthdr.len += sizeof(struct ip);
m->m_flags &= ~(M_MCAST|M_BCAST); /* XXX should do this in clnp_input */
/*
* The reassembly code assumes it will be overwriting a useless
* part of the packet, which is why we need to have it point
* into the packet itself.
*
* Check to see if the data is properly alligned
* so that we can save copying the tcp header.
* This code knows way too much about the structure of mbufs!
*/
off = ((sizeof (long) - 1) & ((m->m_flags & M_EXT) ?
(m->m_data - m->m_ext.ext_buf) : (m->m_data - m->m_pktdat)));
if (off || len < sizeof(struct tcphdr)) {
struct mbuf *m0 = m;
MGETHDR(m, M_DONTWAIT, MT_DATA);
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if (m == 0) {
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m = m0;
goto drop;
}
m->m_next = m0;
m->m_data += max_linkhdr;
m->m_pkthdr = m0->m_pkthdr;
m->m_flags = m0->m_flags & M_COPYFLAGS;
if (len < sizeof(struct tcphdr)) {
m->m_len = 0;
if ((m = m_pullup(m, sizeof(struct tcpiphdr))) == 0) {
tcpstat.tcps_rcvshort++;
return;
}
} else {
bcopy(mtod(m0, caddr_t) + sizeof(struct ip),
mtod(m, caddr_t) + sizeof(struct ip),
sizeof(struct tcphdr));
m0->m_len -= sizeof(struct tcpiphdr);
m0->m_data += sizeof(struct tcpiphdr);
m->m_len = sizeof(struct tcpiphdr);
}
}
/*
* Calculate checksum of extended TCP header and data,
* replacing what would have been IP addresses by
* the IP checksum of the CLNP addresses.
*/
ti = mtod(m, struct tcpiphdr *);
ti->ti_dst.s_addr = tuba_table[lindex]->tc_sum;
if (dst->siso_nlen & 1)
ti->ti_src.s_addr = tuba_table[findex]->tc_sum;
else
ti->ti_src.s_addr = tuba_table[findex]->tc_ssum;
ti->ti_prev = ti->ti_next = 0;
ti->ti_x1 = 0; ti->ti_pr = ISOPROTO_TCP;
ti->ti_len = htons((u_short)tlen);
if (ti->ti_sum = in_cksum(m, m->m_pkthdr.len)) {
tcpstat.tcps_rcvbadsum++;
goto drop;
}
ti->ti_src.s_addr = findex;
ti->ti_dst.s_addr = lindex;
/*
* Now include the rest of TCP input
*/
#define TUBA_INCLUDE
#define in_pcbconnect tuba_pcbconnect
#define tcb tuba_inpcb
#define tcp_last_inpcb tuba_last_inpcb
#include <netinet/tcp_input.c>
}
#define tcp_slowtimo tuba_slowtimo
#define tcp_fasttimo tuba_fasttimo
#include <netinet/tcp_timer.c>