184 lines
5.0 KiB
C
184 lines
5.0 KiB
C
/*-
|
|
* Copyright 1994, 1995 Massachusetts Institute of Technology
|
|
*
|
|
* Permission to use, copy, modify, and distribute this software and
|
|
* its documentation for any purpose and without fee is hereby
|
|
* granted, provided that both the above copyright notice and this
|
|
* permission notice appear in all copies, that both the above
|
|
* copyright notice and this permission notice appear in all
|
|
* supporting documentation, and that the name of M.I.T. not be used
|
|
* in advertising or publicity pertaining to distribution of the
|
|
* software without specific, written prior permission. M.I.T. makes
|
|
* no representations about the suitability of this software for any
|
|
* purpose. It is provided "as is" without express or implied
|
|
* warranty.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''. M.I.T. DISCLAIMS
|
|
* ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
|
|
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
|
|
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
|
|
* SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
|
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
|
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
|
|
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
|
|
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
|
|
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
|
|
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/sysctl.h>
|
|
#include <sys/socket.h>
|
|
#include <sys/mbuf.h>
|
|
|
|
#include <net/if.h>
|
|
#include <net/if_var.h>
|
|
#include <net/if_private.h>
|
|
#include <net/route.h>
|
|
#include <net/route/route_ctl.h>
|
|
#include <net/route/route_var.h>
|
|
#include <net/route/nhop.h>
|
|
#include <net/vnet.h>
|
|
|
|
#include <netinet/in.h>
|
|
#include <netinet/in_var.h>
|
|
#include <netinet/ip.h>
|
|
#include <netinet/ip_icmp.h>
|
|
#include <netinet/ip_var.h>
|
|
|
|
static int
|
|
rib4_set_nh_pfxflags(u_int fibnum, const struct sockaddr *addr, const struct sockaddr *mask,
|
|
struct nhop_object *nh)
|
|
{
|
|
const struct sockaddr_in *addr4 = (const struct sockaddr_in *)addr;
|
|
const struct sockaddr_in *mask4 = (const struct sockaddr_in *)mask;
|
|
bool is_broadcast = false;
|
|
|
|
if (mask == NULL) {
|
|
nhop_set_pxtype_flag(nh, NHF_HOST);
|
|
/*
|
|
* Backward compatibility:
|
|
* if the destination is broadcast,
|
|
* mark route as broadcast.
|
|
* This behavior was useful when route cloning
|
|
* was in place, so there was an explicit cloned
|
|
* route for every broadcasted address.
|
|
* Currently (2020-04) there is no kernel machinery
|
|
* to do route cloning, though someone might explicitly
|
|
* add these routes to support some cases with active-active
|
|
* load balancing. Given that, retain this support.
|
|
*/
|
|
if (in_broadcast(addr4->sin_addr, nh->nh_ifp))
|
|
is_broadcast = true;
|
|
} else if (mask4->sin_addr.s_addr == 0)
|
|
nhop_set_pxtype_flag(nh, NHF_DEFAULT);
|
|
else
|
|
nhop_set_pxtype_flag(nh, 0);
|
|
|
|
nhop_set_broadcast(nh, is_broadcast);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
rib4_augment_nh(u_int fibnum, struct nhop_object *nh)
|
|
{
|
|
/*
|
|
* Check route MTU:
|
|
* inherit interface MTU if not set or
|
|
* check if MTU is too large.
|
|
*/
|
|
if (nh->nh_mtu == 0) {
|
|
nh->nh_mtu = nh->nh_ifp->if_mtu;
|
|
} else if (nh->nh_mtu > nh->nh_ifp->if_mtu)
|
|
nh->nh_mtu = nh->nh_ifp->if_mtu;
|
|
|
|
/* Set nhop type to basic per-AF nhop */
|
|
if (nhop_get_type(nh) == 0) {
|
|
uint16_t nh_type;
|
|
if (nh->nh_flags & NHF_GATEWAY)
|
|
nh_type = NH_TYPE_IPV4_ETHER_NHOP;
|
|
else
|
|
nh_type = NH_TYPE_IPV4_ETHER_RSLV;
|
|
|
|
nhop_set_type(nh, nh_type);
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Initialize our routing tree.
|
|
*/
|
|
struct rib_head *
|
|
in_inithead(uint32_t fibnum)
|
|
{
|
|
struct rib_head *rh;
|
|
|
|
rh = rt_table_init(32, AF_INET, fibnum);
|
|
if (rh == NULL)
|
|
return (NULL);
|
|
|
|
rh->rnh_set_nh_pfxflags = rib4_set_nh_pfxflags;
|
|
rh->rnh_augment_nh = rib4_augment_nh;
|
|
|
|
return (rh);
|
|
}
|
|
|
|
#ifdef VIMAGE
|
|
void
|
|
in_detachhead(struct rib_head *rh)
|
|
{
|
|
|
|
rt_table_destroy(rh);
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* This zaps old routes when the interface goes down or interface
|
|
* address is deleted. In the latter case, it deletes static routes
|
|
* that point to this address. If we don't do this, we may end up
|
|
* using the old address in the future. The ones we always want to
|
|
* get rid of are things like ARP entries, since the user might down
|
|
* the interface, walk over to a completely different network, and
|
|
* plug back in.
|
|
*/
|
|
struct in_ifadown_arg {
|
|
struct ifaddr *ifa;
|
|
int del;
|
|
};
|
|
|
|
static int
|
|
in_ifadownkill(const struct rtentry *rt, const struct nhop_object *nh,
|
|
void *xap)
|
|
{
|
|
struct in_ifadown_arg *ap = xap;
|
|
|
|
if (nh->nh_ifa != ap->ifa)
|
|
return (0);
|
|
|
|
if ((nhop_get_rtflags(nh) & RTF_STATIC) != 0 && ap->del == 0)
|
|
return (0);
|
|
|
|
return (1);
|
|
}
|
|
|
|
void
|
|
in_ifadown(struct ifaddr *ifa, int delete)
|
|
{
|
|
struct in_ifadown_arg arg;
|
|
|
|
KASSERT(ifa->ifa_addr->sa_family == AF_INET,
|
|
("%s: wrong family", __func__));
|
|
|
|
arg.ifa = ifa;
|
|
arg.del = delete;
|
|
|
|
rib_foreach_table_walk_del(AF_INET, in_ifadownkill, &arg);
|
|
ifa->ifa_flags &= ~IFA_ROUTE; /* XXXlocking? */
|
|
}
|