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Hopefully finished kernel syncer (krt) rewrite:

Browse Source 
o  Interface syncing is now a part of krt and it can have configurable
     parameters. Actually, the only one is scan rate now :)
  o  Kernel routing table syncing is now synchronized with interface
     syncing (we need the most recent version of the interface list
     to prevent lots of routes to non-existent destinations from
     appearing). Instead of its own timer, we just check if it's
     route scan time after each iface list scan.
  o  Syncing of device routes implemented.
  o  CONFIG_AUTO_ROUTES should control syncing of automatic device routes.
  o  Rewrote krt_remove_route() to really remove routes :)
  o  Better diagnostics.
  o  Fixed a couple of bugs.
This commit is contained in:
Martin Mares 1998-12-08 18:37:58 +00:00
parent 980297d289
commit 8e66a0ebb9
12 changed files with 211 additions and 75 deletions
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2
TODO
View File

@ -16,9 +16,11 @@ Core
- default preferences of protocols: prefer BGP over OSPF/RIP external routes?
- secondary addresses -> subinterfaces
- check if all protocols set proper packet priorities and TTL's.
- better default protocol names
- config: comments at end of line -> explicit ';' needed?
- remove post-config hooks?
- command-line arguments: name of config file
- static: check validity of route destination?
- static: device routes

9
bird.conf
View File

@ -20,13 +20,18 @@ protocol device {
protocol kernel {
# disabled
learn; # Learn all routes from the kernel
# learn; # Learn all routes from the kernel
scan time 10; # Scan kernel tables every 10 seconds
# route scan time 20; # But routes only every 20 seconds
}
protocol static {
# disabled
route 0.0.0.0/0 via 62.168.0.13
route 62.168.0.0/25 reject
# route 10.0.0.0/8 reject
# route 10.1.0.0:255.255.255.0 via 62.168.0.3
# route 10.1.1.0:255.255.255.0 via 62.168.0.3
# route 10.1.2.0:255.255.255.0 via 62.168.0.3
# route 10.1.3.0:255.255.255.0 via 62.168.0.4
# route 10.2.0.0/24 via "arc0"
}

6
sysdep/linux/krt-scan.Y
View File

@ -12,7 +12,7 @@ CF_HDR
CF_DECLS
CF_KEYWORDS(LEARN, SCAN, TIME)
CF_KEYWORDS(LEARN, ROUTE, SCAN, TIME)
CF_GRAMMAR
@ -22,9 +22,9 @@ krt_scan_item:
LEARN bool {
((struct krt_proto *) this_proto)->scanopt.learn = $2;
}
| SCAN TIME expr {
| ROUTE SCAN TIME expr {
/* Scan time of 0 means scan on startup only */
((struct krt_proto *) this_proto)->scanopt.recurrence = $3;
((struct krt_proto *) this_proto)->scanopt.scan_time = $4;
}
;

88
sysdep/linux/krt-scan.c
View File

@ -8,6 +8,7 @@
#include <string.h>
#include <stdio.h>
#include <ctype.h>
#include <fcntl.h>
#include <unistd.h>
#include <net/route.h>
@ -28,6 +29,22 @@ static int krt_scan_fd = -1;
/* FIXME: Filtering */
struct iface *
krt_temp_iface(struct krt_proto *x, char *name)
{
SCANOPT;
struct iface *i;
WALK_LIST(i, p->temp_ifs)
if (!strcmp(i->name, name))
return i;
i = mb_alloc(x->p.pool, sizeof(struct iface));
bzero(i, sizeof(*i));
strcpy(i->name, name);
add_tail(&p->temp_ifs, &i->n);
return i;
}
static int
krt_uptodate(rte *k, rte *e)
{
@ -35,11 +52,16 @@ krt_uptodate(rte *k, rte *e)
if (ka->dest != ea->dest)
return 0;
if (ka->dest == RTD_ROUTER && !ipa_equal(ka->gw, ea->gw))
return 0;
/* FIXME: Device routes */
switch (ka->dest)
{
case RTD_ROUTER:
return ipa_equal(ka->gw, ea->gw);
case RTD_DEVICE:
return !strcmp(ka->iface->name, ea->iface->name);
default:
return 1;
}
}
static void
krt_parse_entry(byte *ent, struct krt_proto *p)
@ -76,7 +98,10 @@ krt_parse_entry(byte *ent, struct krt_proto *p)
DBG("Got %I/%d via %I flags %x\n", dest, masklen, gw, flags);
if (!(flags & RTF_UP))
{
DBG("Down.\n");
return;
}
if (flags & RTF_HOST)
masklen = 32;
if (flags & (RTF_DYNAMIC | RTF_MODIFIED)) /* Redirect route */
@ -86,6 +111,13 @@ krt_parse_entry(byte *ent, struct krt_proto *p)
}
net = net_get(&master_table, 0, dest, masklen);
if (net->n.flags)
{
/* Route to this destination was already seen. Strange, but it happens... */
DBG("Already seen.\n");
return;
}
a.proto = &p->p;
a.source = RTS_INHERIT;
a.scope = SCOPE_UNIVERSE;
@ -102,7 +134,7 @@ krt_parse_entry(byte *ent, struct krt_proto *p)
a.iface = ng->iface;
else
/* FIXME: Remove this warning? */
log(L_WARN "Kernel told us to use non-neighbor %I for %I/%d\n", gw, net->n.prefix, net->n.pxlen);
log(L_WARN "Kernel told us to use non-neighbor %I for %I/%d", gw, net->n.prefix, net->n.pxlen);
a.dest = RTD_ROUTER;
a.gw = gw;
}
@ -111,10 +143,15 @@ krt_parse_entry(byte *ent, struct krt_proto *p)
a.dest = RTD_UNREACHABLE;
a.gw = IPA_NONE;
}
else if (isalpha(iface[0]))
{
a.dest = RTD_DEVICE;
a.gw = IPA_NONE;
a.iface = krt_temp_iface(p, iface);
}
else
{
/* FIXME: Should support interface routes? */
/* FIXME: What about systems not generating their own if routes? (see CONFIG_AUTO_ROUTES) */
log(L_WARN "Kernel reporting unknown route type to %I/%d", net->n.prefix, net->n.pxlen);
return;
}
@ -135,13 +172,14 @@ krt_parse_entry(byte *ent, struct krt_proto *p)
else
verdict = KRF_DELETE;
DBG("krt_parse_entry: verdict %d\n", verdict);
DBG("krt_parse_entry: verdict=%s\n", ((char *[]) { "CREATE", "SEEN", "UPDATE", "DELETE", "LEARN" }) [verdict]);
net->n.flags = verdict;
if (verdict != KRF_SEEN)
{
/* Get a cached copy of attributes and link the route */
e->attrs = rta_lookup(e->attrs);
a.source = RTS_DUMMY;
e->attrs = rta_lookup(&a);
e->next = net->routes;
net->routes = e;
}
@ -155,7 +193,7 @@ krt_scan_proc(struct krt_proto *p)
byte buf[32768];
int l, seen_hdr;
DBG("Scanning kernel table...\n");
DBG("Scanning kernel routing table...\n");
if (krt_scan_fd < 0)
{
krt_scan_fd = open("/proc/net/route", O_RDONLY);
@ -263,13 +301,18 @@ krt_prune(struct krt_proto *p)
FIB_WALK_END;
}
static void
krt_scan_fire(timer *t)
void
krt_scan_ifaces_done(struct krt_proto *x)
{
struct krt_proto *p = t->data;
SCANOPT;
if (krt_scan_proc(p))
krt_prune(p);
p->accum_time += x->ifopt.scan_time;
if (p->scan_time && p->accum_time >= p->scan_time)
{
p->accum_time %= p->scan_time;
if (krt_scan_proc(x))
krt_prune(x);
}
}
void
@ -277,30 +320,21 @@ krt_scan_preconfig(struct krt_proto *x)
{
SCANOPT;
p->recurrence = 60;
p->scan_time = 1;
p->learn = 0;
init_list(&p->temp_ifs);
}
void
krt_scan_start(struct krt_proto *x)
{
SCANOPT;
timer *t = tm_new(x->p.pool);
p->timer = t;
t->hook = krt_scan_fire;
t->data = x;
t->recurrent = p->recurrence;
krt_scan_fire(t);
if (t->recurrent)
tm_start(t, t->recurrent);
/* Force krt scan after first interface scan */
p->accum_time = p->scan_time - x->ifopt.scan_time;
}
void
krt_scan_shutdown(struct krt_proto *x)
{
SCANOPT;
tm_stop(p->timer);
/* FIXME: Remove all krt's? */
}

5
sysdep/linux/krt-scan.h
View File

@ -10,9 +10,10 @@
#define _BIRD_KRT_SCAN_H_
struct krt_scan_params {
int recurrence; /* How often should we scan krt, 0=only on startup */
int learn; /* Should we learn routes from the kernel? */
struct timer *timer;
list temp_ifs; /* Temporary interfaces */
int scan_time; /* How often should we scan krt, 0=only on startup */
int accum_time; /* Accumulated scanning time */
};
#endif

2
sysdep/unix/Modules
View File

@ -9,3 +9,5 @@ krt.Y
krt.h
krt-set.c
krt-set.h
krt-iface.h
krt-iface.Y

30
sysdep/unix/krt-iface.Y Normal file
View File

@ -0,0 +1,30 @@
/*
* BIRD -- UNIX Interface Syncer Configuration
*
* (c) 1998 Martin Mares <mj@ucw.cz>
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
CF_HDR
#include "lib/krt-scan.h"
CF_DECLS
CF_KEYWORDS(LEARN, ROUTE, SCAN, TIME)
CF_GRAMMAR
CF_ADDTO(kern_proto, kern_proto krt_if_item ';')
krt_if_item:
SCAN TIME expr {
/* Scan time of 0 means scan on startup only */
((struct krt_proto *) this_proto)->ifopt.scan_time = $3;
}
;
CF_CODE
CF_END

16
sysdep/unix/krt-iface.h Normal file
View File

@ -0,0 +1,16 @@
/*
* BIRD -- Unix Kernel Interface Syncer -- Setting Parameters
*
* (c) 1998 Martin Mares <mj@ucw.cz>
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
#ifndef _BIRD_KRT_IFACE_H_
#define _BIRD_KRT_IFACE_H_
struct krt_if_params {
int scan_time;
};
#endif

82
sysdep/unix/krt-set.c
View File

@ -29,9 +29,7 @@ krt_capable(rte *e)
return
a->cast == RTC_UNICAST &&
(a->dest == RTD_ROUTER
#ifndef CONFIG_AUTO_ROUTES
|| a->dest == RTD_DEVICE
#endif
#ifdef RTF_REJECT
|| a->dest == RTD_UNREACHABLE
#endif
@ -39,38 +37,25 @@ krt_capable(rte *e)
!a->tos;
}
void
krt_remove_route(rte *old)
static inline int
krt_capable_op(rte *e)
{
net *net = old->net;
rta *a = e->attrs;
#ifdef CONFIG_AUTO_ROUTES
if (a->dest == RTD_ROUTER && a->source == RTS_DEVICE)
return 0;
#endif
return krt_capable(e);
}
static void
krt_ioctl(int ioc, rte *e, char *name)
{
net *net = e->net;
struct rtentry re;
rta *a = e->attrs;
if (!krt_capable(old) || old->attrs->source == RTS_INHERIT)
{
DBG("krt_remove_route(ignored %I/%d)\n", net->n.prefix, net->n.pxlen);
return;
}
DBG("krt_remove_route(%I/%d)\n", net->n.prefix, net->n.pxlen);
bzero(&re, sizeof(re));
fill_in_sockaddr((struct sockaddr_in *) &re.rt_dst, net->n.prefix, 0);
fill_in_sockaddr((struct sockaddr_in *) &re.rt_genmask, ipa_mkmask(net->n.pxlen), 0);
if (ioctl(if_scan_sock, SIOCDELRT, &re) < 0)
log(L_ERR "SIOCDELRT(%I/%d): %m", net->n.prefix, net->n.pxlen);
}
void
krt_add_route(rte *new)
{
net *net = new->net;
struct rtentry re;
rta *a = new->attrs;
if (!krt_capable(new) || new->attrs->source == RTS_INHERIT)
{
DBG("krt_add_route(ignored %I/%d)\n", net->n.prefix, net->n.pxlen);
return;
}
DBG("krt_add_route(%I/%d)\n", net->n.prefix, net->n.pxlen);
bzero(&re, sizeof(re));
fill_in_sockaddr((struct sockaddr_in *) &re.rt_dst, net->n.prefix, 0);
fill_in_sockaddr((struct sockaddr_in *) &re.rt_genmask, ipa_mkmask(net->n.pxlen), 0);
@ -83,11 +68,9 @@ krt_add_route(rte *new)
fill_in_sockaddr((struct sockaddr_in *) &re.rt_gateway, a->gw, 0);
re.rt_flags |= RTF_GATEWAY;
break;
#ifndef CONFIG_AUTO_ROUTES
case RTD_DEVICE:
re.rt_dev = a->iface->name;
break;
#endif
#ifdef RTF_REJECT
case RTD_UNREACHABLE:
re.rt_flags |= RTF_REJECT;
@ -97,8 +80,36 @@ krt_add_route(rte *new)
die("krt set: unknown flags, but not filtered");
}
if (ioctl(if_scan_sock, SIOCADDRT, &re) < 0)
log(L_ERR "SIOCADDRT(%I/%d): %m", net->n.prefix, net->n.pxlen);
if (ioctl(if_scan_sock, ioc, &re) < 0)
log(L_ERR "%s(%I/%d): %m", name, net->n.prefix, net->n.pxlen);
}
void
krt_remove_route(rte *old)
{
net *net = old->net;
if (!krt_capable_op(old))
{
DBG("krt_remove_route(ignored %I/%d)\n", net->n.prefix, net->n.pxlen);
return;
}
DBG("krt_remove_route(%I/%d)\n", net->n.prefix, net->n.pxlen);
krt_ioctl(SIOCDELRT, old, "SIOCDELRT");
}
void
krt_add_route(rte *new)
{
net *net = new->net;
if (!krt_capable_op(new))
{
DBG("krt_add_route(ignored %I/%d)\n", net->n.prefix, net->n.pxlen);
return;
}
DBG("krt_add_route(%I/%d)\n", net->n.prefix, net->n.pxlen);
krt_ioctl(SIOCADDRT, new, "SIOCADDRT");
}
void
@ -119,4 +130,3 @@ krt_set_preconfig(struct krt_proto *x)
die("krt set: missing socket");
x->p.rt_notify = krt_set_notify;
}

9
sysdep/unix/krt.h
View File

@ -11,6 +11,7 @@
#include "lib/krt-scan.h"
#include "lib/krt-set.h"
#include "lib/krt-iface.h"
/* Flags stored in net->n.flags */
@ -28,6 +29,7 @@ struct krt_proto {
struct proto p;
struct krt_set_params setopt;
struct krt_scan_params scanopt;
struct krt_if_params ifopt;
};
extern struct proto *cf_krt_proto;
@ -37,9 +39,16 @@ extern struct proto *cf_krt_proto;
void krt_scan_preconfig(struct krt_proto *);
void krt_scan_start(struct krt_proto *);
void krt_scan_shutdown(struct krt_proto *);
void krt_scan_ifaces_done(struct krt_proto *);
/* krt-set.c */
void krt_set_preconfig(struct krt_proto *);
/* sync-if.c */
void krt_if_preconfig(struct krt_proto *);
void krt_if_start(struct krt_proto *);
void krt_if_shutdown(struct krt_proto *);
#endif

38
sysdep/unix/sync-if.c
View File

@ -17,12 +17,14 @@
#include "nest/bird.h"
#include "nest/iface.h"
#include "nest/route.h"
#include "nest/protocol.h"
#include "lib/timer.h"
#include "lib/krt.h"
#include "unix.h"
int if_scan_sock;
int if_scan_period = 60;
static timer *if_scan_timer;
@ -131,8 +133,9 @@ scan_if(timer *t)
struct ifconf ic;
static int last_ifbuf_size = 4*sizeof(struct ifreq);
int res;
struct krt_proto *p = t->data;
DBG("Scanning interfaces...\n");
DBG("It's interface scan time...\n");
for(;;)
{
if (last_ifbuf_size)
@ -165,6 +168,32 @@ scan_if(timer *t)
DBG("Increased ifconf buffer size to %d\n", last_ifbuf_size);
#endif
}
krt_scan_ifaces_done(p);
}
void
krt_if_start(struct krt_proto *p)
{
if_scan_timer = tm_new(&root_pool);
if_scan_timer->hook = scan_if;
if_scan_timer->data = p;
if_scan_timer->recurrent = p->ifopt.scan_time;
scan_if(if_scan_timer);
tm_start(if_scan_timer, p->ifopt.scan_time);
}
void
krt_if_preconfig(struct krt_proto *p)
{
p->ifopt.scan_time = 60;
}
void
krt_if_shutdown(struct krt_proto *p)
{
tm_stop(if_scan_timer);
rfree(if_scan_timer);
/* FIXME: What should we do with interfaces? */
}
void
@ -174,9 +203,4 @@ scan_if_init(void)
DBG("Using socket %d for interface and route scanning\n", if_scan_sock);
if (if_scan_sock < 0)
die("Cannot create scanning socket: %m");
scan_if(NULL);
if_scan_timer = tm_new(&root_pool);
if_scan_timer->hook = scan_if;
if_scan_timer->recurrent = if_scan_period;
tm_start(if_scan_timer, if_scan_period);
}

3
sysdep/unix/sync-rt.c
View File

@ -30,6 +30,7 @@ krt_start(struct proto *P)
{
struct krt_proto *p = (struct krt_proto *) P;
krt_scan_start(p);
krt_if_start(p);
}
void
@ -37,6 +38,7 @@ krt_shutdown(struct proto *P, int time)
{
struct krt_proto *p = (struct krt_proto *) P;
krt_scan_shutdown(p);
krt_if_shutdown(p);
}
void
@ -50,6 +52,7 @@ krt_preconfig(struct protocol *x)
p->p.shutdown = krt_shutdown;
krt_scan_preconfig(p);
krt_set_preconfig(p);
krt_if_preconfig(p);
}
struct protocol proto_unix_kernel = {