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
parent
86b0023033
commit
a103373f61
4 changed files with 376 additions and 1 deletions
2
Makefile
2
Makefile
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@ -9,7 +9,7 @@ OPT=-O2
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DEBUG=-g#gdb
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CFLAGS=$(OPT) $(DEBUG) -Wall -W -Wstrict-prototypes -Wno-unused -Wno-parentheses
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PROTOCOLS=
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PROTOCOLS=rip
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LIBDIRS=sysdep/linux sysdep/unix lib
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STDDIRS=nest $(addprefix proto/,$(PROTOCOLS))
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DIRS=$(STDDIRS) $(OBJDIR)/lib
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4
proto/rip/Makefile
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4
proto/rip/Makefile
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@ -0,0 +1,4 @@
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THISDIR=proto/rip
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OBJS=rip.o
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include ../../Rules
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311
proto/rip/rip.c
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311
proto/rip/rip.c
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@ -0,0 +1,311 @@
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/*
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* Rest in pieces - RIP protocol
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*
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* (c) 1998 Pavel Machek <pavel@ucw.cz>
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*
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* Can be freely distributed and used under the terms of the GNU GPL.
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*/
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#define LOCAL_DEBUG
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#include <string.h>
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#include <stdlib.h>
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#include "nest/bird.h"
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#include "nest/iface.h"
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#include "nest/protocol.h"
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#include "nest/route.h"
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#include "lib/socket.h"
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#include "lib/resource.h"
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#include "lib/lists.h"
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#include "lib/timer.h"
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#include "rip.h"
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int infinity = 16;
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/* XXX should be 520 */
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#define RIP_PORT 1520
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static void
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rip_if_notify(struct proto *p, unsigned c, struct iface *old, struct iface *new)
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{
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}
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static void
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rip_reply(struct proto *p)
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{
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P->listen->tbuf = "ACK!";
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sk_send_to( P->listen, 5, P->listen->faddr, P->listen->fport );
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}
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#define BAD( x ) { log( L_WARN "RIP/%s: " x "\n", p->name ); return; }
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static int
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process_authentication( struct proto *p, struct rip_block *block )
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{
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return 0;
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}
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static struct rip_entry *
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find_entry( struct proto *p, ip_addr network, ip_addr netmask )
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{
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struct node *e;
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CHK_MAGIC;
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WALK_LIST( e, P->rtable ) {
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if (ipa_equal( network, E->network ) &&
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ipa_equal( netmask, E->netmask )) {
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return E;
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}
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}
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return NULL;
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}
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#define ipa_from_u32(a) (*(ip_addr *) &a)
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static struct rip_entry *
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new_entry( struct proto *p, struct rip_block *b, ip_addr whotoldme )
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{
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struct rip_entry *e;
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e = mb_alloc(p->pool, sizeof( struct rip_entry ));
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e->whotoldme = whotoldme;
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e->network = ipa_from_u32( b->network );
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e->netmask = ipa_from_u32( b->netmask );
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/* FIXME: verify that it is really netmask */
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if (b->nexthop)
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e->nexthop = ipa_from_u32( b->nexthop );
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else
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e->nexthop = whotoldme;
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e->tag = ntohs( b->tag );
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e->metric = ntohl( b->metric );
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e->updated = e->changed = now;
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return e;
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}
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static void
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kill_entry( struct proto *p, struct rip_entry *e )
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{
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struct rip_connection *c;
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rem_node( NODE e );
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WALK_LIST( c, P->connections ) {
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if (c->sendptr == e)
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die( "kill_entry: one of connections has this as current, fix me!" );
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}
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mb_free( e );
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}
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#define DELETE( msg ) { debug( msg ); kill_entry( p, e ); e = NULL; }
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static void
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process_block( struct proto *p, struct rip_block *block, ip_addr whotoldme )
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{
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struct rip_entry *e;
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int metric = ntohl( block->metric );
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ip_addr network = ipa_from_u32( block->network );
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CHK_MAGIC;
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if ((!metric) || (metric > infinity)) {
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log( L_WARN "Got metric %d from %I\n", metric, whotoldme );
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return;
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}
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/* XXX Check if destination looks valid - ie not net 0 or 127 */
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/* XXX Should add configurable ammount */
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if (metric < infinity)
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metric++;
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debug( "block: %I tells me: %I available, metric %d... ", whotoldme, network, metric );
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e = find_entry( p, network, ipa_from_u32( block->netmask ) );
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if (e && (e->metric > metric)) /* || if same metrics and this is much newer */
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DELETE( "better metrics... " );
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if (e && ((e->updated - now) > 180))
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DELETE( "more than 180 seconds old... " );
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if (e && ipa_equal( whotoldme, e->whotoldme ) &&
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(e->metric == metric)) {
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debug( "old news, updating time" );
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e->updated = now;
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}
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if (!e) {
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debug( "this is new" );
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e = new_entry( p, block, whotoldme );
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add_head( &P->rtable, NODE e );
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}
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debug( "\n" );
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}
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#undef DELETE
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static void
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rip_process_packet( struct proto *p, struct rip_packet *packet, int num, ip_addr whotoldme, int port )
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{
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int i;
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switch( packet->heading.version ) {
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case RIP_V1: debug( "Warning: I do not talk ripv1\n" ); break;
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case RIP_V2: break;
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case '!': debug( "OOk, sir!\n" ); break;
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default: BAD( "Unknown version" );
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}
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switch( packet->heading.command ) {
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case 1: debug( "Asked to send my routing table\n" ); break;
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case 2: debug( "Part of routing table came\n" );
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if (port != RIP_PORT) {
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log( L_AUTH "%I send me routing info from port %d\n", whotoldme, port );
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return;
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}
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if (!neigh_find( p, &whotoldme, 0 )) {
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log( L_AUTH "%I send me routing info but he is not my neighbour\n", whotoldme );
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return;
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}
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/* Should check if it is not my own packet */
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for (i=0; i<num; i++) {
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struct rip_block *block = &packet->block[i];
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if (block->family == 0xffff)
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if (!i) {
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if (process_authentication(p, block))
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BAD( "Authentication failed\n" );
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} else BAD( "Authentication is not the first!" );
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process_block( p, block, whotoldme );
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}
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break;
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case 3:
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case 4: BAD( "I was asked for traceon/traceoff\n" );
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case 5: BAD( "Some Sun extension around here\n" );
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case '!': debug( "He gave me!\n" ); break;
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default: BAD( "Unknown command" );
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}
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rip_reply(p);
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}
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static void
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rip_rx(sock *s, int size)
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{
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struct proto *p = s->data;
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int num;
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CHK_MAGIC;
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debug( "RIP: message came: %d bytes\n", size );
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if (size <= 0) BAD( "Zero sized packet" );
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size -= sizeof( struct rip_packet_heading );
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if (size < 0) BAD( "Too small packet" );
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if (size % sizeof( struct rip_block )) BAD( "Odd sized packet" );
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num = size / sizeof( struct rip_block );
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if (num>25) BAD( "Too many blocks" );
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rip_process_packet( p, (struct rip_packet *) s->rbuf, num, s->faddr, s->fport );
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}
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static void
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rip_dump_entry( struct rip_entry *e )
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{
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debug( "%I told me %d/%d ago: to %I/%I go via %I, metric %d\n",
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e->whotoldme, e->updated-now, e->changed-now, e->network, e->netmask, e->nexthop, e->metric );
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}
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static void
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rip_timer(timer *t)
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{
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struct proto *p = t->data;
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struct rip_entry *e, *et;
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CHK_MAGIC;
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debug( "RIP: tick tock\n" );
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WALK_LIST_DELSAFE( e, et, P->rtable ) {
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if ((now - E->updated) > (180+120)) {
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debug( "RIP: entry is too old: " );
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rip_dump_entry( E );
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kill_entry( p, E );
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}
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}
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}
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static void
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rip_start(struct proto *p)
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{
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debug( "RIP: initializing instance...\n" );
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P->listen = sk_new( p->pool );
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P->listen->type = SK_UDP;
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P->listen->sport = RIP_PORT;
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P->listen->rx_hook = rip_rx;
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P->listen->data = p;
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P->listen->rbsize = 10240;
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P->magic = RIP_MAGIC;
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if (sk_open(P->listen)<0)
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die( "RIP/%s: could not listen\n", p->name );
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init_list( &P->rtable );
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init_list( &P->connections );
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P->timer = tm_new( p->pool );
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P->timer->data = p;
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P->timer->randomize = 5;
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P->timer->recurrent = 30;
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P->timer->hook = rip_timer;
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tm_start( P->timer, 30 );
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debug( "RIP: ...done\n");
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}
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static void
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rip_init(struct protocol *p)
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{
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debug( "RIP: initializing RIP...\n" );
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}
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static void
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rip_dump(struct proto *p)
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{
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int i;
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node *w, *e;
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i = 0;
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WALK_LIST( w, P->connections ) {
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struct rip_connection *n = w;
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debug( "RIP: connection #%d: %I\n", i, n->addr );
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}
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i = 0;
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WALK_LIST( e, P->rtable ) {
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debug( "RIP: entry #%d: ", i++ );
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rip_dump_entry( E );
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}
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}
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static void
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rip_preconfig(struct protocol *x)
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{
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struct proto *p = proto_new(&proto_rip, sizeof(struct rip_data));
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debug( "RIP: preconfig\n" );
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p->preference = DEF_PREF_DIRECT;
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p->start = rip_start;
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p->if_notify = rip_if_notify;
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p->dump = rip_dump;
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}
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static void
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rip_postconfig(struct protocol *p)
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{
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}
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struct protocol proto_rip = {
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{ NULL, NULL },
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"RIP",
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0,
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rip_init,
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rip_preconfig,
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rip_postconfig
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};
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60
proto/rip/rip.h
Normal file
60
proto/rip/rip.h
Normal file
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@ -0,0 +1,60 @@
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/*
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* Structures for RIP protocol
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*/
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struct rip_connection {
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ip_addr addr;
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struct rip_entry *sendptr;
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sock *send;
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};
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struct rip_packet_heading {
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u8 command;
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u8 version;
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#define RIP_V1 1
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#define RIP_V2 2
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u16 unused;
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};
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struct rip_block {
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u16 family; /* 0xffff on first message means this is authentication */
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u16 tag;
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u32 network;
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u32 netmask;
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u32 nexthop;
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u32 metric;
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};
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struct rip_entry {
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node n;
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ip_addr whotoldme;
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ip_addr network;
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ip_addr netmask;
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ip_addr nexthop;
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int metric;
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u16 tag;
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bird_clock_t updated, changed;
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};
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struct rip_packet {
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struct rip_packet_heading heading;
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struct rip_block block[25];
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};
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struct rip_data {
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struct proto inherited;
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sock *listen;
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timer *timer;
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list connections;
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list rtable;
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int magic;
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};
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#define P ((struct rip_data *) p)
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#define E ((struct rip_entry *) e)
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#define RIP_MAGIC 81861253
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#define CHK_MAGIC do { if (P->magic != RIP_MAGIC) die( "Not enough magic\n" ); } while (0)
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