mirror of
https://gitlab.nic.cz/labs/bird.git
synced 2024-12-22 09:41:54 +00:00
We parse /proc/net/route and flag RT entries according to it. More to come
today in the morning...
This commit is contained in:
parent
4c45595e3b
commit
16a8ba30a9
2
TODO
2
TODO
@ -3,6 +3,8 @@ Core
|
||||
* router id
|
||||
* right usage of DBG vs. debug
|
||||
|
||||
- TOS not supported by kernel -> automatically drop routes with TOS<>0
|
||||
|
||||
- use -freg-struct-return ?
|
||||
|
||||
- fake multipath?
|
||||
|
@ -7,23 +7,153 @@
|
||||
*/
|
||||
|
||||
#include <string.h>
|
||||
#include <stdio.h>
|
||||
#include <fcntl.h>
|
||||
#include <unistd.h>
|
||||
#include <net/route.h>
|
||||
|
||||
#define LOCAL_DEBUG
|
||||
|
||||
#include "nest/bird.h"
|
||||
#include "nest/iface.h"
|
||||
#include "nest/route.h"
|
||||
#include "nest/protocol.h"
|
||||
#include "nest/iface.h"
|
||||
#include "lib/timer.h"
|
||||
#include "lib/unix.h"
|
||||
#include "lib/krt.h"
|
||||
|
||||
#define SCANOPT struct krt_scan_params *p = &x->scanopt
|
||||
|
||||
static int krt_scan_fd = -1;
|
||||
|
||||
static void
|
||||
krt_parse_entry(byte *e)
|
||||
{
|
||||
u32 dest0, gw0, mask0;
|
||||
ip_addr dest, gw, mask;
|
||||
unsigned int flags;
|
||||
int masklen;
|
||||
net *net;
|
||||
byte *iface = e;
|
||||
|
||||
if (sscanf(e, "%*s\t%x\t%x\t%x\t%*d\t%*d\t%*d\t%x\t", &dest0, &gw0, &flags, &mask0) != 4)
|
||||
{
|
||||
log(L_ERR "krt read: unable to parse `%s'", e);
|
||||
return;
|
||||
}
|
||||
while (*e != '\t')
|
||||
e++;
|
||||
*e = 0;
|
||||
|
||||
dest = ipa_from_u32(dest0);
|
||||
ipa_ntoh(dest);
|
||||
gw = ipa_from_u32(gw0);
|
||||
ipa_ntoh(gw);
|
||||
mask = ipa_from_u32(mask0);
|
||||
ipa_ntoh(mask);
|
||||
if ((masklen = ipa_mklen(mask)) < 0)
|
||||
{
|
||||
log(L_ERR "krt read: invalid netmask %08x", mask0);
|
||||
return;
|
||||
}
|
||||
DBG("Got %I/%d via %I flags %x\n", dest, masklen, gw, flags);
|
||||
|
||||
if (!(flags & RTF_UP))
|
||||
return;
|
||||
if (flags & RTF_HOST)
|
||||
masklen = 32;
|
||||
if (flags & (RTF_DYNAMIC | RTF_MODIFIED)) /* Redirect route */
|
||||
{
|
||||
log(L_WARN "krt: Ignoring redirect to %I/%d via %I", dest, masklen, gw);
|
||||
return;
|
||||
}
|
||||
net = net_get(&master_table, 0, dest, masklen);
|
||||
if (net->routes)
|
||||
{
|
||||
rte *e = net->routes;
|
||||
rta *a = e->attrs;
|
||||
int ok;
|
||||
switch (a->dest)
|
||||
{
|
||||
case RTD_ROUTER:
|
||||
ok = (flags & RTF_GATEWAY) && ipa_equal(gw, a->gw);
|
||||
break;
|
||||
case RTD_DEVICE:
|
||||
#ifdef CONFIG_AUTO_ROUTES
|
||||
ok = 1;
|
||||
#else
|
||||
ok = !(flags & RTF_GATEWAY) && !strcmp(iface, a->iface->name);
|
||||
#endif
|
||||
break;
|
||||
case RTD_UNREACHABLE:
|
||||
ok = flags & RTF_REJECT;
|
||||
default:
|
||||
ok = 0;
|
||||
}
|
||||
net->n.flags |= ok ? KRF_SEEN : KRF_UPDATE;
|
||||
}
|
||||
else
|
||||
{
|
||||
#ifdef CONFIG_AUTO_ROUTES
|
||||
if (!(flags & RTF_GATEWAY)) /* It's a device route */
|
||||
return;
|
||||
#endif
|
||||
net->n.flags |= KRF_UPDATE;
|
||||
}
|
||||
}
|
||||
|
||||
static int
|
||||
krt_scan_proc(void)
|
||||
{
|
||||
byte buf[32768];
|
||||
int l, seen_hdr;
|
||||
|
||||
if (krt_scan_fd < 0)
|
||||
{
|
||||
krt_scan_fd = open("/proc/net/route", O_RDONLY);
|
||||
if (krt_scan_fd < 0)
|
||||
die("/proc/net/route: %m");
|
||||
}
|
||||
else if (lseek(krt_scan_fd, 0, SEEK_SET) < 0)
|
||||
{
|
||||
log(L_ERR "krt seek: %m");
|
||||
return 0;
|
||||
}
|
||||
seen_hdr = 0;
|
||||
while ((l = read(krt_scan_fd, buf, sizeof(buf))) > 0)
|
||||
{
|
||||
byte *z = buf;
|
||||
if (l & 127)
|
||||
{
|
||||
log(L_ERR "krt read: misaligned entry: l=%d", l);
|
||||
return 0;
|
||||
}
|
||||
while (l >= 128)
|
||||
{
|
||||
if (seen_hdr++)
|
||||
krt_parse_entry(z);
|
||||
z += 128;
|
||||
l -= 128;
|
||||
}
|
||||
}
|
||||
if (l < 0)
|
||||
{
|
||||
log(L_ERR "krt read: %m");
|
||||
return 0;
|
||||
}
|
||||
DBG("KRT scan done, seen %d lines\n", seen_hdr);
|
||||
return 1;
|
||||
}
|
||||
|
||||
static void
|
||||
krt_scan_fire(timer *t)
|
||||
{
|
||||
struct krt_proto *x = t->data;
|
||||
SCANOPT;
|
||||
|
||||
DBG("Scanning kernel table...\n");
|
||||
if (!krt_scan_proc())
|
||||
return;
|
||||
}
|
||||
|
||||
void
|
||||
|
Loading…
Reference in New Issue
Block a user