Commiting RIP. RIP should somehow listen, will not reply. I needed to

commit it so that whole thing compiles.
This commit is contained in:
Pavel Machek 1998-07-09 19:39:04 +00:00
parent 86b0023033
commit a103373f61
4 changed files with 376 additions and 1 deletions

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@ -9,7 +9,7 @@ OPT=-O2
DEBUG=-g#gdb DEBUG=-g#gdb
CFLAGS=$(OPT) $(DEBUG) -Wall -W -Wstrict-prototypes -Wno-unused -Wno-parentheses CFLAGS=$(OPT) $(DEBUG) -Wall -W -Wstrict-prototypes -Wno-unused -Wno-parentheses
PROTOCOLS= PROTOCOLS=rip
LIBDIRS=sysdep/linux sysdep/unix lib LIBDIRS=sysdep/linux sysdep/unix lib
STDDIRS=nest $(addprefix proto/,$(PROTOCOLS)) STDDIRS=nest $(addprefix proto/,$(PROTOCOLS))
DIRS=$(STDDIRS) $(OBJDIR)/lib DIRS=$(STDDIRS) $(OBJDIR)/lib

4
proto/rip/Makefile Normal file
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@ -0,0 +1,4 @@
THISDIR=proto/rip
OBJS=rip.o
include ../../Rules

311
proto/rip/rip.c Normal file
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/*
* Rest in pieces - RIP protocol
*
* (c) 1998 Pavel Machek <pavel@ucw.cz>
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
#define LOCAL_DEBUG
#include <string.h>
#include <stdlib.h>
#include "nest/bird.h"
#include "nest/iface.h"
#include "nest/protocol.h"
#include "nest/route.h"
#include "lib/socket.h"
#include "lib/resource.h"
#include "lib/lists.h"
#include "lib/timer.h"
#include "rip.h"
int infinity = 16;
/* XXX should be 520 */
#define RIP_PORT 1520
static void
rip_if_notify(struct proto *p, unsigned c, struct iface *old, struct iface *new)
{
}
static void
rip_reply(struct proto *p)
{
P->listen->tbuf = "ACK!";
sk_send_to( P->listen, 5, P->listen->faddr, P->listen->fport );
}
#define BAD( x ) { log( L_WARN "RIP/%s: " x "\n", p->name ); return; }
static int
process_authentication( struct proto *p, struct rip_block *block )
{
return 0;
}
static struct rip_entry *
find_entry( struct proto *p, ip_addr network, ip_addr netmask )
{
struct node *e;
CHK_MAGIC;
WALK_LIST( e, P->rtable ) {
if (ipa_equal( network, E->network ) &&
ipa_equal( netmask, E->netmask )) {
return E;
}
}
return NULL;
}
#define ipa_from_u32(a) (*(ip_addr *) &a)
static struct rip_entry *
new_entry( struct proto *p, struct rip_block *b, ip_addr whotoldme )
{
struct rip_entry *e;
e = mb_alloc(p->pool, sizeof( struct rip_entry ));
e->whotoldme = whotoldme;
e->network = ipa_from_u32( b->network );
e->netmask = ipa_from_u32( b->netmask );
/* FIXME: verify that it is really netmask */
if (b->nexthop)
e->nexthop = ipa_from_u32( b->nexthop );
else
e->nexthop = whotoldme;
e->tag = ntohs( b->tag );
e->metric = ntohl( b->metric );
e->updated = e->changed = now;
return e;
}
static void
kill_entry( struct proto *p, struct rip_entry *e )
{
struct rip_connection *c;
rem_node( NODE e );
WALK_LIST( c, P->connections ) {
if (c->sendptr == e)
die( "kill_entry: one of connections has this as current, fix me!" );
}
mb_free( e );
}
#define DELETE( msg ) { debug( msg ); kill_entry( p, e ); e = NULL; }
static void
process_block( struct proto *p, struct rip_block *block, ip_addr whotoldme )
{
struct rip_entry *e;
int metric = ntohl( block->metric );
ip_addr network = ipa_from_u32( block->network );
CHK_MAGIC;
if ((!metric) || (metric > infinity)) {
log( L_WARN "Got metric %d from %I\n", metric, whotoldme );
return;
}
/* XXX Check if destination looks valid - ie not net 0 or 127 */
/* XXX Should add configurable ammount */
if (metric < infinity)
metric++;
debug( "block: %I tells me: %I available, metric %d... ", whotoldme, network, metric );
e = find_entry( p, network, ipa_from_u32( block->netmask ) );
if (e && (e->metric > metric)) /* || if same metrics and this is much newer */
DELETE( "better metrics... " );
if (e && ((e->updated - now) > 180))
DELETE( "more than 180 seconds old... " );
if (e && ipa_equal( whotoldme, e->whotoldme ) &&
(e->metric == metric)) {
debug( "old news, updating time" );
e->updated = now;
}
if (!e) {
debug( "this is new" );
e = new_entry( p, block, whotoldme );
add_head( &P->rtable, NODE e );
}
debug( "\n" );
}
#undef DELETE
static void
rip_process_packet( struct proto *p, struct rip_packet *packet, int num, ip_addr whotoldme, int port )
{
int i;
switch( packet->heading.version ) {
case RIP_V1: debug( "Warning: I do not talk ripv1\n" ); break;
case RIP_V2: break;
case '!': debug( "OOk, sir!\n" ); break;
default: BAD( "Unknown version" );
}
switch( packet->heading.command ) {
case 1: debug( "Asked to send my routing table\n" ); break;
case 2: debug( "Part of routing table came\n" );
if (port != RIP_PORT) {
log( L_AUTH "%I send me routing info from port %d\n", whotoldme, port );
return;
}
if (!neigh_find( p, &whotoldme, 0 )) {
log( L_AUTH "%I send me routing info but he is not my neighbour\n", whotoldme );
return;
}
/* Should check if it is not my own packet */
for (i=0; i<num; i++) {
struct rip_block *block = &packet->block[i];
if (block->family == 0xffff)
if (!i) {
if (process_authentication(p, block))
BAD( "Authentication failed\n" );
} else BAD( "Authentication is not the first!" );
process_block( p, block, whotoldme );
}
break;
case 3:
case 4: BAD( "I was asked for traceon/traceoff\n" );
case 5: BAD( "Some Sun extension around here\n" );
case '!': debug( "He gave me!\n" ); break;
default: BAD( "Unknown command" );
}
rip_reply(p);
}
static void
rip_rx(sock *s, int size)
{
struct proto *p = s->data;
int num;
CHK_MAGIC;
debug( "RIP: message came: %d bytes\n", size );
if (size <= 0) BAD( "Zero sized packet" );
size -= sizeof( struct rip_packet_heading );
if (size < 0) BAD( "Too small packet" );
if (size % sizeof( struct rip_block )) BAD( "Odd sized packet" );
num = size / sizeof( struct rip_block );
if (num>25) BAD( "Too many blocks" );
rip_process_packet( p, (struct rip_packet *) s->rbuf, num, s->faddr, s->fport );
}
static void
rip_dump_entry( struct rip_entry *e )
{
debug( "%I told me %d/%d ago: to %I/%I go via %I, metric %d\n",
e->whotoldme, e->updated-now, e->changed-now, e->network, e->netmask, e->nexthop, e->metric );
}
static void
rip_timer(timer *t)
{
struct proto *p = t->data;
struct rip_entry *e, *et;
CHK_MAGIC;
debug( "RIP: tick tock\n" );
WALK_LIST_DELSAFE( e, et, P->rtable ) {
if ((now - E->updated) > (180+120)) {
debug( "RIP: entry is too old: " );
rip_dump_entry( E );
kill_entry( p, E );
}
}
}
static void
rip_start(struct proto *p)
{
debug( "RIP: initializing instance...\n" );
P->listen = sk_new( p->pool );
P->listen->type = SK_UDP;
P->listen->sport = RIP_PORT;
P->listen->rx_hook = rip_rx;
P->listen->data = p;
P->listen->rbsize = 10240;
P->magic = RIP_MAGIC;
if (sk_open(P->listen)<0)
die( "RIP/%s: could not listen\n", p->name );
init_list( &P->rtable );
init_list( &P->connections );
P->timer = tm_new( p->pool );
P->timer->data = p;
P->timer->randomize = 5;
P->timer->recurrent = 30;
P->timer->hook = rip_timer;
tm_start( P->timer, 30 );
debug( "RIP: ...done\n");
}
static void
rip_init(struct protocol *p)
{
debug( "RIP: initializing RIP...\n" );
}
static void
rip_dump(struct proto *p)
{
int i;
node *w, *e;
i = 0;
WALK_LIST( w, P->connections ) {
struct rip_connection *n = w;
debug( "RIP: connection #%d: %I\n", i, n->addr );
}
i = 0;
WALK_LIST( e, P->rtable ) {
debug( "RIP: entry #%d: ", i++ );
rip_dump_entry( E );
}
}
static void
rip_preconfig(struct protocol *x)
{
struct proto *p = proto_new(&proto_rip, sizeof(struct rip_data));
debug( "RIP: preconfig\n" );
p->preference = DEF_PREF_DIRECT;
p->start = rip_start;
p->if_notify = rip_if_notify;
p->dump = rip_dump;
}
static void
rip_postconfig(struct protocol *p)
{
}
struct protocol proto_rip = {
{ NULL, NULL },
"RIP",
0,
rip_init,
rip_preconfig,
rip_postconfig
};

60
proto/rip/rip.h Normal file
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@ -0,0 +1,60 @@
/*
* Structures for RIP protocol
*/
struct rip_connection {
ip_addr addr;
struct rip_entry *sendptr;
sock *send;
};
struct rip_packet_heading {
u8 command;
u8 version;
#define RIP_V1 1
#define RIP_V2 2
u16 unused;
};
struct rip_block {
u16 family; /* 0xffff on first message means this is authentication */
u16 tag;
u32 network;
u32 netmask;
u32 nexthop;
u32 metric;
};
struct rip_entry {
node n;
ip_addr whotoldme;
ip_addr network;
ip_addr netmask;
ip_addr nexthop;
int metric;
u16 tag;
bird_clock_t updated, changed;
};
struct rip_packet {
struct rip_packet_heading heading;
struct rip_block block[25];
};
struct rip_data {
struct proto inherited;
sock *listen;
timer *timer;
list connections;
list rtable;
int magic;
};
#define P ((struct rip_data *) p)
#define E ((struct rip_entry *) e)
#define RIP_MAGIC 81861253
#define CHK_MAGIC do { if (P->magic != RIP_MAGIC) die( "Not enough magic\n" ); } while (0)