## diffname port/deviproute.c 1991/0330
## diff -e /dev/null /n/bootesdump/1991/0330/sys/src/9/port/deviproute.c
0a
#include <u.h>
#include <libc.h>
typedef struct Iproute Iproute;
typedef struct Iprtab Iprtab;
enum
{
Nroutes= 256,
};
/*
* Standard ip masks for the 3 classes
*/
uchar classmask[4][4] = {
0xff, 0, 0, 0,
0xff, 0, 0, 0,
0xff, 0xff, 0, 0,
0xff, 0xff, 0xff, 0,
};
#define CLASSMASK(x) classmask[(*x>>6) & 3]
/*
* routes
*/
struct Iproute {
uchar dst[4];
uchar gate[4];
uchar mask[4];
Iproute *next;
int inuse;
};
struct Iprtab {
/* Lock; */
Iproute *first;
Iproute r[Nroutes]; /* routings */
};
Iprtab iprtab;
#define lock(x)
#define unlock(x)
void
printroute(void)
{
Iproute *r;
print("\n");
for(r = iprtab.first; r; r = r->next)
print("%d.%d.%d.%d %d.%d.%d.%d %d.%d.%d.%d\n",
r->dst[0], r->dst[1], r->dst[2], r->dst[3],
r->mask[0], r->mask[1], r->mask[2], r->mask[3],
r->gate[0], r->gate[1], r->gate[2], r->gate[3]);
print("\n");
}
/*
* The chosen route is the one obeys the constraint
* r->mask[x] & dst[x] == r->dst[x] for x in 0 1 2 3
*
* If there are several matches, the one whose mask has the most
* leading ones (and hence is the most specific) wins.
*
* If there is no match, the default gateway is chosen.
*/
void
iproute(uchar *dst, uchar *gate)
{
Iproute *r;
/*
* first check routes
*/
lock(&iprtab);
for(r = iprtab.first; r; r = r->next){
if((r->mask[0]&dst[0]) == r->dst[0]
&& (r->mask[1]&dst[1]) == r->dst[1]
&& (r->mask[2]&dst[2]) == r->dst[2]
&& (r->mask[3]&dst[3]) == r->dst[3]){
memmove(gate, r->gate, 4);
unlock(&iprtab);
return;
}
}
unlock(&iprtab);
/*
* else just return what we got
*/
memmove(gate, dst, 4);
}
/*
* Compares 2 subnet masks and returns an integer less than, equal to,
* or greater than 0, according as m1 is numericly less than,
* equal to, or greater than m2.
*/
ipmaskcmp(uchar *m1, uchar *m2)
{
int a, i;
for(i = 0; i < 4; i++){
if(a = *m1++ - *m2++)
return a;
}
return 0;
}
/*
* Add a route, create a mask if the first mask is 0.
*
* All routes are stored sorted by the length of leading
* ones in the mask.
*
* NOTE: A default route has an all zeroes mask and dst.
*/
void
ipaddroute(uchar *dst, uchar *mask, uchar *gate)
{
Iproute *r, *e, *free;
int i;
if(mask==0)
mask = CLASSMASK(dst);
/*
* filter out impossible requests
*/
for(i = 0; i < 4; i++)
if((dst[i]&mask[i]) != dst[i])
return;
/*
* see if we already have a route for
* the destination
*/
lock(&iprtab);
free = 0;
for(r = iprtab.r; r < &iprtab.r[Nroutes]; r++){
if(r->inuse == 0){
free = r;
continue;
}
if(memcmp(dst, r->dst, 4)==0 && memcmp(mask, r->mask, 4)==0){
memmove(r->gate, gate, 4);
unlock(&iprtab);
return;
}
}
/*
* add the new route in sorted order
*/
memmove(free->dst, dst, 4);
memmove(free->mask, mask, 4);
memmove(free->gate, gate, 4);
free->inuse = 1;
for(r = iprtab.first; r; r = r->next){
if(ipmaskcmp(free->mask, r->mask) > 0)
break;
e = r;
}
free->next = r;
if(r == iprtab.first)
iprtab.first = free;
else
e->next = free;
unlock(&iprtab);
}
/*
* remove a route
*/
void
ipremroute(uchar *dst, uchar *mask)
{
Iproute *r, *e;
lock(&iprtab);
for(r = iprtab.first; r; r = r->next){
if(memcmp(dst, r->dst, 4)==0 && memcmp(mask, r->mask, 4)==0){
if(r == iprtab.first)
iprtab.first = r->next;
else
e->next = r->next;
r->inuse = 0;
break;
}
e = r;
}
unlock(&iprtab);
}
/*
* remove all routes
*/
void
ipflushroute(void)
{
Iproute *r;
lock(&iprtab);
for(r = iprtab.first; r; r = r->next)
r->inuse = 0;
iprtab.first = 0;
unlock(&iprtab);
}
.
## diffname port/deviproute.c 1991/0331
## diff -e /n/bootesdump/1991/0330/sys/src/9/port/deviproute.c /n/bootesdump/1991/0331/sys/src/9/port/deviproute.c
206a
}
/*
* device interface
*/
enum{
Qdir,
Qdata,
};
Dirtab iproutetab[]={
"iproute", Qdata, 0, 0600,
};
#define Niproutetab (sizeof(iproutetab)/sizeof(Dirtab))
void
iproutereset(void)
{
}
void
iprouteinit(void)
{
}
Chan *
iprouteattach(char *spec)
{
return devattach('R', spec);
}
Chan *
iprouteclone(Chan *c, Chan *nc)
{
return devclone(c, nc);
}
int
iproutewalk(Chan *c, char *name)
{
return devwalk(c, name, iproutetab, (long)Niproutetab, devgen);
}
void
iproutestat(Chan *c, char *db)
{
devstat(c, db, iproutetab, (long)Niproutetab, devgen);
}
Chan *
iprouteopen(Chan *c, int omode)
{
if(c->qid.path == CHDIR){
if(omode != OREAD)
error(Eperm);
}
c->mode = openmode(omode);
c->flag |= COPEN;
c->offset = 0;
return c;
}
void
iproutecreate(Chan *c, char *name, int omode, ulong perm)
{
error(Eperm);
}
void
iprouteremove(Chan *c)
{
error(Eperm);
}
void
iproutewstat(Chan *c, char *dp)
{
error(Eperm);
}
void
iprouteclose(Chan *c)
{
}
#define IPR_ENTRYLEN 54
#define PAD " "
long
iprouteread(Chan *c, void *a, long n)
{
char buf[IPR_ENTRYLEN*2];
Iproute *r;
int part, bytes, size;
switch((int)(c->qid.path&~CHDIR)){
case Qdir:
return devdirread(c, a, n, iproutetab, Niproutetab, devgen);
case Qdata:
lock(&iprtab);
part = c->offset/IPR_ENTRYLEN;
for(r = iprtab.first; part && r; r = r->next)
;
bytes = c->offset;
while(bytes < iprtab.n*IPR_ENTRYLEN && n){
part = bytes%IPR_ENTRYLEN;
sprint(buf,"%d.%d.%d.%d & %d.%d.%d.%d -> %d.%d.%d.%d%s",
r->dst[0], r->dst[1], r->dst[2], r->dst[3],
r->mask[0], r->mask[1], r->mask[2], r->mask[3],
r->gate[0], r->gate[1], r->gate[2], r->gate[3],
PAD);
buf[IPR_ENTRYLEN-1] = '\n';
size = IPR_ENTRYLEN - part;
size = MIN(n, size);
memmove(a, buf+part, size);
a = (void *)((int)a + size);
n -= size;
bytes += size;
}
unlock(&iprtab);
return bytes - c->offset;
break;
default:
n=0;
break;
}
return n;
}
long
iproutewrite(Chan *c, char *a, long n)
{
char buf[IPR_ENTRYLEN];
char *field[4];
uchar mask[4], dst[4], gate[4];
int m;
switch((int)(c->qid.path&~CHDIR)){
case Qdata:
strncpy(buf, a, sizeof buf);
m = getfields(buf, field, 4, ' ');
if(strncmp(field[0], "flush", 5) == 0)
ipflushroute();
else if(strcmp(field[0], "add") == 0){
switch(m){
case 4:
strtoip(field[1], dst);
strtoip(field[2], mask);
strtoip(field[3], gate);
ipaddroute(dst, mask, gate);
break;
case 3:
strtoip(field[1], dst);
strtoip(field[2], gate);
ipaddroute(dst, 0, gate);
break;
default:
error(Ebadarg);
}
} else if(strcmp(field[0], "delete") == 0){
switch(m){
case 3:
strtoip(field[1], dst);
strtoip(field[2], mask);
ipremroute(dst, mask);
break;
case 2:
strtoip(field[1], dst);
ipremroute(dst, 0);
break;
default:
error(Ebadarg);
}
}
break;
default:
error(Ebadusefd);
}
return n;
.
205a
iprtab.n = 0;
.
186a
iprtab.n--;
.
167a
iprtab.n++;
.
149a
if(free == 0)
errors("no free ip routes");
.
131c
errors("bad ip route");
.
48,54c
/* convert the bytes */
for(i = 0; i<4 & *rptr; i++)
addr[i] = strtoul(rptr, &rptr, 0);
/* move host bytes to the right place */
first = NETBYTES(addr);
off = 4 - i;
if(off)
while(i != first){
--i;
addr[i+off] = addr[i];
}
.
46c
int i, off, first;
char *rptr = s;
.
44c
strtoip(char *s, uchar *addr)
.
40,42c
/*
* Convert string to ip address. This is rediculously difficult because
* the designers of ip decided to allow any leading zero bytes in the
* host part to be left out.
*/
.
34,36c
Lock;
int n; /* number of valid routes */
Iproute *first; /* list of valid routes */
Iproute r[Nroutes]; /* all routes */
.
22a
uchar netbytes[4] = { 1, 1, 2, 3 };
#define NETBYTES(x) netbytes[(*x>>6) & 3]
.
3a
#include "devtab.h"
.
1,2c
#include "u.h"
#include "lib.h"
#include "mem.h"
#include "dat.h"
#include "fns.h"
#include "errno.h"
.
## diffname port/deviproute.c 1991/0401
## diff -e /n/bootesdump/1991/0331/sys/src/9/port/deviproute.c /n/bootesdump/1991/0401/sys/src/9/port/deviproute.c
401,402c
dst = ipparse(field[1]);
ipremroute(dst, classmask[dst>>30]);
.
396,397c
dst = ipparse(field[1]);
mask = ipparse(field[2]);
.
386,388c
dst = ipparse(field[1]);
gate = ipparse(field[2]);
ipaddroute(dst, classmask[dst>>30], gate);
.
380,382c
dst = ipparse(field[1]);
mask = ipparse(field[2]);
gate = ipparse(field[3]);
.
367c
Ipaddr mask, dst, gate;
.
350a
r = r->next;
.
345c
if(size > n)
size = n;
.
337,339c
dst[0], dst[1], dst[2], dst[3],
mask[0], mask[1], mask[2], mask[3],
gate[0], gate[1], gate[2], gate[3],
.
335a
hnputl(dst, r->dst);
hnputl(mask, r->mask);
hnputl(gate, r->gate);
.
333c
while(r && bytes < iprtab.n*IPR_ENTRYLEN && n){
.
331c
part--;
.
322a
uchar dst[4], mask[4], gate[4];
.
320c
char buf[IPR_ENTRYLEN*3];
.
201,202c
for(r = e = iprtab.first; r; r = r->next){
if(dst==r->dst && mask==r->mask){
.
196c
ipremroute(ulong dst, ulong mask)
.
178,179c
for(r = e = iprtab.first; r; r = r->next){
if(mask > r->mask)
.
174,176c
free->dst = dst;
free->mask = mask;
free->gate = gate;
.
169a
}
.
168c
if(free == 0){
unlock(&iprtab);
.
162,163c
if(dst==r->dst && mask==r->mask){
r->gate = gate;
.
147,149c
if((dst&mask) != dst)
errors("bad ip route");
.
141,143d
136c
ipaddroute(ulong dst, ulong mask, ulong gate)
.
112,127d
106c
* else just return the same address
.
103d
94,99c
if((r->mask&udst) == r->dst){
hnputl(gate, r->gate);
.
92d
88a
udst = nhgetl(dst);
if((udst&Mymask) == (Myip&Mymask)){
memmove(gate, dst, 4);
return;
}
.
87a
ulong udst;
.
80,82c
* leading ones (and hence is the most specific) wins. This is
* forced by storing the routes in decreasing number of ones order
* and returning the first match. The default gateway has no ones
* in the mask and is thus the last matched.
.
77c
* r->mask & dst == r->dst
.
51,75d
36,38c
ulong dst;
ulong gate;
ulong mask;
.
19,32d
9a
/*
* All ip numbers and masks are stored as ulongs.
* All interfaces to this code uses the standard byte
* string representation.
*/
.
6a
#include "arp.h"
#include "ipdat.h"
.
## diffname port/deviproute.c 1991/0411
## diff -e /n/bootesdump/1991/0401/sys/src/9/port/deviproute.c /n/bootesdump/1991/0411/sys/src/9/port/deviproute.c
322c
iproutewrite(Chan *c, char *a, long n, ulong offset)
.
312c
return bytes - offset;
.
286c
bytes = offset;
.
283c
part = offset/IPR_ENTRYLEN;
.
271c
iprouteread(Chan *c, void *a, long n, ulong offset)
.
## diffname port/deviproute.c 1991/0418
## diff -e /n/bootesdump/1991/0411/sys/src/9/port/deviproute.c /n/bootesdump/1991/0418/sys/src/9/port/deviproute.c
210c
return devattach('P', spec);
.
## diffname port/deviproute.c 1991/0419
## diff -e /n/bootesdump/1991/0418/sys/src/9/port/deviproute.c /n/bootesdump/1991/0419/sys/src/9/port/deviproute.c
222a
}
Chan*
iprouteclwalk(Chan *c, char *name)
{
return devclwalk(c, name);
.
193c
"iproute", {Qdata}, 0, 0600,
.
## diffname port/deviproute.c 1991/0427
## diff -e /n/bootesdump/1991/0419/sys/src/9/port/deviproute.c /n/bootesdump/1991/0427/sys/src/9/port/deviproute.c
225,230d
## diffname port/deviproute.c 1991/0629
## diff -e /n/bootesdump/1991/0427/sys/src/9/port/deviproute.c /n/bootesdump/1991/0629/sys/src/9/port/deviproute.c
193c
"iproute", {Qdata}, 0, 0666,
.
## diffname port/deviproute.c 1991/0705
## diff -e /n/bootesdump/1991/0629/sys/src/9/port/deviproute.c /n/bootesdump/1991/0705/sys/src/9/port/deviproute.c
193c
"iproute", {Qdata}, 0, 0600,
.
## diffname port/deviproute.c 1991/1112
## diff -e /n/bootesdump/1991/0705/sys/src/9/port/deviproute.c /n/bootesdump/1991/1112/sys/src/9/port/deviproute.c
193c
"iproute", {Qdata}, 0, 0666,
.
## diffname port/deviproute.c 1991/1115
## diff -e /n/bootesdump/1991/1112/sys/src/9/port/deviproute.c /n/bootesdump/1991/1115/sys/src/9/port/deviproute.c
264a
USED(c);
.
258a
USED(c, dp);
.
252a
USED(c);
.
246a
USED(c, name, omode, perm);
.
## diffname port/deviproute.c 1992/0111
## diff -e /n/bootesdump/1991/1115/sys/src/9/port/deviproute.c /n/bootesdump/1992/0111/sys/src/9/port/deviproute.c
6c
#include "../port/error.h"
.
## diffname port/deviproute.c 1992/0112
## diff -e /n/bootesdump/1992/0111/sys/src/9/port/deviproute.c /n/bootesdump/1992/0112/sys/src/9/port/deviproute.c
121c
error(Enoroute);
.
100c
error(Ebadaddr);
.
## diffname port/deviproute.c 1992/0114
## diff -e /n/bootesdump/1992/0112/sys/src/9/port/deviproute.c /n/bootesdump/1992/0114/sys/src/9/port/deviproute.c
121c
exhausted("routes");
.
100c
error(Enetaddr);
.
## diffname port/deviproute.c 1992/0213
## diff -e /n/bootesdump/1992/0114/sys/src/9/port/deviproute.c /n/bootesdump/1992/0213/sys/src/9/port/deviproute.c
61c
if((udst&Mymask) == (Myip[Myself]&Mymask)){
.
## diffname port/deviproute.c 1992/0304
## diff -e /n/bootesdump/1992/0213/sys/src/9/port/deviproute.c /n/bootesdump/1992/0304/sys/src/9/port/deviproute.c
61c
if((udst&Mynetmask) == (Myip[Myself]&Mynetmask)){
.
## diffname port/deviproute.c 1992/0321
## diff -e /n/bootesdump/1992/0304/sys/src/9/port/deviproute.c /n/bootesdump/1992/0321/sys/src/9/port/deviproute.c
2c
#include "../port/lib.h"
.
## diffname port/deviproute.c 1992/0711
## diff -e /n/bootesdump/1992/0321/sys/src/9/port/deviproute.c /n/bootesdump/1992/0711/sys/src/9/port/deviproute.c
331a
USED(offset);
.
94d
## diffname port/deviproute.c 1993/0804 # deleted
## diff -e /n/bootesdump/1992/0711/sys/src/9/port/deviproute.c /n/fornaxdump/1993/0804/sys/src/brazil/port/deviproute.c
1,377d
|
