bird/sysdep/unix/krt-set.c
Martin Mares 2d14045224 Rewrote the kernel syncer. The old layering was horrible.
The new kernel syncer is cleanly split between generic UNIX module
and OS dependent submodules:

  -  krt.c (the generic part)
  -  krt-iface (low-level functions for interface handling)
  -  krt-scan (low-level functions for routing table scanning)
  -  krt-set (low-level functions for setting of kernel routes)

krt-set and krt-iface are common for all BSD-like Unices, krt-scan is heavily
system dependent (most Unices require /dev/kmem parsing, Linux uses /proc),
Netlink substitues all three modules.

We expect each UNIX port supports kernel routing table scanning, kernel
interface table scanning, kernel route manipulation and possibly also
asynchronous event notifications (new route, interface state change;
not implemented yet) and build the KRT protocol on the top of these
primitive operations.
1999-03-03 19:49:56 +00:00

139 lines
2.7 KiB
C

/*
* BIRD -- Unix Routing Table Syncing
*
* (c) 1998--1999 Martin Mares <mj@ucw.cz>
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
#include <string.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <sys/ioctl.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 "lib/unix.h"
#include "lib/krt.h"
int
krt_capable(rte *e)
{
rta *a = e->attrs;
return
a->cast == RTC_UNICAST &&
(a->dest == RTD_ROUTER
|| a->dest == RTD_DEVICE
#ifdef RTF_REJECT
|| a->dest == RTD_UNREACHABLE
#endif
) &&
!a->tos;
}
static inline int
krt_capable_op(rte *e)
{
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;
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);
re.rt_flags = RTF_UP;
if (net->n.pxlen == 32)
re.rt_flags |= RTF_HOST;
switch (a->dest)
{
case RTD_ROUTER:
fill_in_sockaddr((struct sockaddr_in *) &re.rt_gateway, a->gw, 0);
re.rt_flags |= RTF_GATEWAY;
break;
case RTD_DEVICE:
re.rt_dev = a->iface->name;
break;
#ifdef RTF_REJECT
case RTD_UNREACHABLE:
re.rt_flags |= RTF_REJECT;
break;
#endif
default:
bug("krt set: unknown flags, but not filtered");
}
if (ioctl(if_scan_sock, ioc, &re) < 0)
log(L_ERR "%s(%I/%d): %m", name, net->n.prefix, net->n.pxlen);
}
static 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");
}
static 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
krt_set_notify(struct proto *x, net *net, rte *new, rte *old)
{
if (old)
krt_remove_route(old);
if (new)
krt_add_route(new);
}
void
krt_set_start(struct krt_proto *x)
{
if (if_scan_sock < 0)
bug("krt set: missing socket");
}
void
krt_set_preconfig(struct krt_config *c)
{
}
void
krt_set_shutdown(struct krt_proto *x)
{
}