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-rw-r--r--proto/rip/rip.c189
-rw-r--r--proto/rip/rip.h5
2 files changed, 135 insertions, 59 deletions
diff --git a/proto/rip/rip.c b/proto/rip/rip.c
index 497c490..c755c18 100644
--- a/proto/rip/rip.c
+++ b/proto/rip/rip.c
@@ -1,7 +1,7 @@
/*
* Rest in pieces - RIP protocol
*
- * (c) 1998 Pavel Machek <pavel@ucw.cz>
+ * Copyright (c) 1998 Pavel Machek <pavel@ucw.cz>
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
@@ -24,10 +24,10 @@
int infinity = 16;
-/* XXX should be 520 */
+/* FIXME: should be 520 */
#define RIP_PORT 1520
-/* XXX should be 30 */
+/* FIXME: should be 30 */
#define RIP_TIME 5
static void
@@ -44,26 +44,62 @@ rip_reply(struct proto *p)
*/
static struct rip_entry *
-find_entry( struct proto *p, ip_addr network, ip_addr netmask )
+find_entry( struct proto *p, ip_addr network, int pxlen )
{
struct node *e;
CHK_MAGIC;
WALK_LIST( e, P->rtable ) {
if (ipa_equal( network, E->network ) &&
- (ipa_mklen( netmask ) == E->pxlen)) {
+ (pxlen == E->pxlen)) {
return E;
}
}
return NULL;
}
+/* Let main routing table know about our new entry */
+static void
+advertise_entry( struct proto *p, struct rip_entry *e )
+{
+ rta *a, A;
+ rte *r;
+ net *n;
+
+ bzero(&A, sizeof(A));
+ A.proto = p;
+ A.source = RTS_RIP;
+ A.scope = SCOPE_UNIVERSE;
+ A.cast = RTC_UNICAST;
+ A.dest = RTD_ROUTER;
+ A.tos = 0;
+ A.flags = 0;
+ A.gw = e->nexthop;
+ A.from = e->whotoldme;
+ A.iface = /* FIXME: need to set somehow */ NULL;
+ /* set to: interface of nexthop */
+ a = rta_lookup(&A);
+ n = net_get( &master_table, 0, e->network, e->pxlen );
+ r = rte_get_temp(a);
+ r->pflags = 0; /* Here go my flags */
+ rte_update( n, p, r );
+}
+
static struct rip_entry *
-new_entry( struct proto *p, struct rip_block *b, ip_addr whotoldme )
+new_entry( struct proto *p )
{
struct rip_entry *e;
-
e = mb_alloc(p->pool, sizeof( struct rip_entry ));
+ bzero( e, sizeof( struct rip_entry ));
+ return e;
+}
+
+/* Create new entry from data rip_block */
+static struct rip_entry *
+new_entry_from_block( struct proto *p, struct rip_block *b, ip_addr whotoldme )
+{
+ struct rip_entry *e = new_entry( p );
+
e->whotoldme = whotoldme;
e->network = b->network;
e->pxlen = ipa_mklen( b->netmask );
@@ -75,52 +111,45 @@ new_entry( struct proto *p, struct rip_block *b, ip_addr whotoldme )
e->tag = ntohs( b->tag );
e->metric = ntohl( b->metric );
e->updated = e->changed = now;
-
- {
- rta *a, A;
- rte *r;
- net *n;
-
- bzero(&A, sizeof(A));
- A.proto = p;
- A.source = RTS_RIP;
- A.scope = SCOPE_UNIVERSE;
- A.cast = RTC_UNICAST;
- A.dest = RTD_ROUTER;
- A.tos = 0;
- A.flags = 0;
- A.gw = e->nexthop;
- A.from = e->whotoldme;
- A.iface = /* fixme: need to set somehow */ NULL;
- /* set to: interface of nexthop */
- a = rta_lookup(&A);
- n = net_get( &master_table, 0, e->network, e->pxlen );
- r = rte_get_temp(a);
- r->pflags = 0; /* Here go my flags */
- rte_update( n, p, r );
- }
-
return e;
}
+/* Delete one of entries */
static void
-kill_entry( struct proto *p, struct rip_entry *e )
+kill_entry_ourrt( struct proto *p, struct rip_entry *e )
{
struct rip_connection *c;
net *n;
- n = net_find(&master_table, 0, e->network, e->pxlen );
- if (!n) debug( "Could not find entry to delete in main routing table.\n" );
- else rte_update( n, p, NULL );
-
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!" );
+ if (c->sendptr == e) {
+ debug( "Deleting from under someone's sendptr...\n" );
+ c->sendptr = (void *) (NODE c->sendptr)->next;
+ }
}
mb_free( e );
}
+/* Delete one of entries */
+static void
+kill_entry_mainrt( struct proto *p, struct rip_entry *e )
+{
+ struct rip_connection *c;
+ net *n;
+
+ n = net_find(&master_table, 0, e->network, e->pxlen );
+ if (!n) log( L_ERR "Could not find entry to delete in main routing table.\n" );
+ else rte_update( n, p, NULL );
+}
+
+static void
+kill_entry( struct proto *p, struct rip_entry *e )
+{
+ kill_entry_mainrt( p, e );
+ kill_entry_ourrt( p, e );
+}
+
/*
* Output processing
*/
@@ -159,11 +188,16 @@ givemore:
break;
debug( "." );
packet->block[i].family = htons( 2 ); /* AF_INET */
- packet->block[i].tag = htons( 0 ); /* What should I set it to? */
+ packet->block[i].tag = htons( 0 ); /* FIXME: What should I set it to? */
packet->block[i].network = c->sendptr->network;
packet->block[i].netmask = ipa_mkmask( c->sendptr->pxlen );
packet->block[i].nexthop = IPA_NONE; /* FIXME: How should I set it? */
packet->block[i].metric = htonl( c->sendptr->metric );
+ if (ipa_equal(c->sendptr->whotoldme, s->daddr)) {
+ debug( "(split horizont)" );
+ /* FIXME: should we do it in all cases? */
+ packet->block[i].metric = infinity;
+ }
ipa_hton( packet->block[i].network );
ipa_hton( packet->block[i].netmask );
ipa_hton( packet->block[i].nexthop );
@@ -215,7 +249,6 @@ rip_sendto( struct proto *p, ip_addr daddr, int dport )
rip_tx( c->send );
}
-
/*
* Input processing
*/
@@ -223,6 +256,7 @@ rip_sendto( struct proto *p, ip_addr daddr, int dport )
static int
process_authentication( struct proto *p, struct rip_block *block )
{
+ /* FIXME: Should do md5 authentication */
return 0;
}
@@ -241,15 +275,15 @@ process_block( struct proto *p, struct rip_block *block, ip_addr whotoldme )
return;
}
- /* XXX Check if destination looks valid - ie not net 0 or 127 */
+ /* FIXME: Check if destination looks valid - ie not net 0 or 127 */
- /* XXX Should add configurable ammount */
+ /* FIXME: Should add configurable ammount */
if (metric < infinity)
metric++;
debug( "block: %I tells me: %I/%I available, metric %d... ", whotoldme, network, block->netmask, metric );
- e = find_entry( p, network, block->netmask );
+ e = find_entry( p, network, ipa_mklen( block->netmask ));
if (e && (e->metric > metric)) /* || if same metrics and this is much newer */
DELETE( "better metrics... " );
@@ -264,7 +298,12 @@ process_block( struct proto *p, struct rip_block *block, ip_addr whotoldme )
if (!e) {
debug( "this is new" );
- e = new_entry( p, block, whotoldme );
+ e = new_entry_from_block( p, block, whotoldme );
+ if (!e) {
+ debug( "Something went wrong with new_entry?\n" );
+ return;
+ }
+ advertise_entry( p, e );
add_head( &P->rtable, NODE e );
}
@@ -287,10 +326,10 @@ rip_process_packet( struct proto *p, struct rip_packet *packet, int num, ip_addr
}
switch( packet->heading.command ) {
- case 1: debug( "Asked to send my routing table\n" );
+ case RIPCMD_REQUEST: debug( "Asked to send my routing table\n" );
rip_sendto( p, whotoldme, port );
break;
- case 2: debug( "Part of routing table came\n" );
+ case RIPCMD_RESPONSE: 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 0;
@@ -301,7 +340,7 @@ rip_process_packet( struct proto *p, struct rip_packet *packet, int num, ip_addr
return 0;
}
- /* Should check if it is not my own packet */
+ /* FIXME: Should check if it is not my own packet */
for (i=0; i<num; i++) {
struct rip_block *block = &packet->block[i];
@@ -320,8 +359,8 @@ rip_process_packet( struct proto *p, struct rip_packet *packet, int num, ip_addr
process_block( p, block, whotoldme );
}
break;
- case 3:
- case 4: BAD( "I was asked for traceon/traceoff\n" );
+ case RIPCMD_TRACEON:
+ case RIPCMD_TRACEOFF: BAD( "I was asked for traceon/traceoff\n" );
case 5: BAD( "Some Sun extension around here\n" );
default: BAD( "Unknown command" );
}
@@ -338,7 +377,6 @@ rip_rx(sock *s, int size)
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" );
@@ -356,8 +394,10 @@ rip_rx(sock *s, int size)
static void
rip_dump_entry( struct rip_entry *e )
{
- debug( "%I told me %d/%d ago: to %I/%d go via %I, metric %d\n",
+ debug( "%I told me %d/%d ago: to %I/%d go via %I, metric %d ",
e->whotoldme, e->updated-now, e->changed-now, e->network, e->pxlen, e->nexthop, e->metric );
+ if (e->flags & RIP_F_EXTERNAL) debug( "[external]" );
+ debug( "\n" );
}
static void
@@ -370,11 +410,12 @@ rip_timer(timer *t)
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 );
- }
+ if (!(E->flags & RIP_F_EXTERNAL))
+ if ((now - E->updated) > (180+120)) {
+ debug( "RIP: entry is too old: " );
+ rip_dump_entry( E );
+ kill_entry( p, E );
+ }
}
#if 0
@@ -382,6 +423,8 @@ rip_timer(timer *t)
rip_sendto( p, _MI( 0x0a000001 ), RIP_PORT );
#endif
+ /* FIXME: Should broadcast routing tables to all known interfaces every 30 seconds */
+
debug( "RIP: tick tock done\n" );
}
@@ -440,6 +483,37 @@ rip_if_notify(struct proto *p, unsigned c, struct iface *old, struct iface *new)
}
static void
+rip_rt_notify(struct proto *p, struct network *net, struct rte *new, struct rte *old)
+{
+ debug( "rip: new entry came\n" );
+ /* FIXME: should add/delete that entry from my routing tables, and
+ set it so that it never times out */
+
+ if (old) {
+ struct rip_entry *e = find_entry( p, net->n.prefix, net->n.pxlen );
+ if (!e)
+ log( L_ERR "Deleting nonexistent entry?!\n" );
+
+ kill_entry_ourrt( p, e );
+ }
+
+ /* FIXME: what do we do if we already know route to that target? We were not prepared to that. */
+
+ if (new) {
+ struct rip_entry *e = new_entry( p );
+
+ e->whotoldme = IPA_NONE;
+ e->network = net->n.prefix;
+ e->pxlen = net->n.pxlen;
+ e->nexthop = IPA_NONE; /* FIXME: is it correct? */
+ e->tag = 0; /* FIXME: how to set tag? */
+ e->metric = 1; /* FIXME: how to set metric? */
+ e->updated = e->changed = now;
+ e->flags = RIP_F_EXTERNAL;
+ }
+}
+
+static void
rip_preconfig(struct protocol *x)
{
struct proto *p = proto_new(&proto_rip, sizeof(struct rip_data));
@@ -448,6 +522,7 @@ rip_preconfig(struct protocol *x)
p->preference = DEF_PREF_DIRECT;
p->start = rip_start;
p->if_notify = rip_if_notify;
+ p->rt_notify = rip_rt_notify;
p->dump = rip_dump;
}
diff --git a/proto/rip/rip.h b/proto/rip/rip.h
index 3af19ee..5d78b2e 100644
--- a/proto/rip/rip.h
+++ b/proto/rip/rip.h
@@ -36,16 +36,17 @@ struct rip_block {
struct rip_entry {
node n;
- ip_addr whotoldme;
+ ip_addr whotoldme;
ip_addr network;
int pxlen;
ip_addr nexthop;
-
int metric;
u16 tag;
bird_clock_t updated, changed;
+ int flags;
+#define RIP_F_EXTERNAL 1
};
struct rip_packet {
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-01 10:43:11 +0100