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|
/*
* Kernel routing table updates by routing socket.
* Copyright (C) 1997, 98 Kunihiro Ishiguro
*
* This file is part of GNU Zebra.
*
* GNU Zebra is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2, or (at your option) any
* later version.
*
* GNU Zebra is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; see the file COPYING; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <zebra.h>
#ifndef HAVE_NETLINK
#ifdef __OpenBSD__
#include <netmpls/mpls.h>
#endif
#include "if.h"
#include "prefix.h"
#include "sockunion.h"
#include "log.h"
#include "privs.h"
#include "vxlan.h"
#include "zebra/debug.h"
#include "zebra/rib.h"
#include "zebra/rt.h"
#include "zebra/kernel_socket.h"
#include "zebra/zebra_mpls.h"
extern struct zebra_privs_t zserv_privs;
#ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN
/* Adjust netmask socket length. Return value is a adjusted sin_len
value. */
static int sin_masklen(struct in_addr mask)
{
char *p, *lim;
int len;
struct sockaddr_in sin;
if (mask.s_addr == 0)
return sizeof(long);
sin.sin_addr = mask;
len = sizeof(struct sockaddr_in);
lim = (char *)&sin.sin_addr;
p = lim + sizeof(sin.sin_addr);
while (*--p == 0 && p >= lim)
len--;
return len;
}
#endif /* HAVE_STRUCT_SOCKADDR_IN_SIN_LEN */
#ifdef __OpenBSD__
static int kernel_rtm_add_labels(struct nexthop_label *nh_label,
struct sockaddr_mpls *smpls)
{
if (nh_label->num_labels > 1) {
zlog_warn(
"%s: can't push %u labels at "
"once (maximum is 1)",
__func__, nh_label->num_labels);
return -1;
}
memset(smpls, 0, sizeof(*smpls));
smpls->smpls_len = sizeof(*smpls);
smpls->smpls_family = AF_MPLS;
smpls->smpls_label = htonl(nh_label->label[0] << MPLS_LABEL_OFFSET);
return 0;
}
#endif
/* Interface between zebra message and rtm message. */
static int kernel_rtm_ipv4(int cmd, struct prefix *p, struct route_entry *re)
{
struct sockaddr_in *mask = NULL;
struct sockaddr_in sin_dest, sin_mask, sin_gate;
#ifdef __OpenBSD__
struct sockaddr_mpls smpls;
#endif
union sockunion *smplsp = NULL;
struct nexthop *nexthop;
int nexthop_num = 0;
ifindex_t ifindex = 0;
int gate = 0;
int error;
char prefix_buf[PREFIX_STRLEN];
enum blackhole_type bh_type = BLACKHOLE_UNSPEC;
if (IS_ZEBRA_DEBUG_RIB)
prefix2str(p, prefix_buf, sizeof(prefix_buf));
memset(&sin_dest, 0, sizeof(struct sockaddr_in));
sin_dest.sin_family = AF_INET;
#ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN
sin_dest.sin_len = sizeof(struct sockaddr_in);
#endif /* HAVE_STRUCT_SOCKADDR_IN_SIN_LEN */
sin_dest.sin_addr = p->u.prefix4;
memset(&sin_mask, 0, sizeof(struct sockaddr_in));
memset(&sin_gate, 0, sizeof(struct sockaddr_in));
sin_gate.sin_family = AF_INET;
#ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN
sin_gate.sin_len = sizeof(struct sockaddr_in);
#endif /* HAVE_STRUCT_SOCKADDR_IN_SIN_LEN */
/* Make gateway. */
for (ALL_NEXTHOPS(re->nexthop, nexthop)) {
if (CHECK_FLAG(nexthop->flags, NEXTHOP_FLAG_RECURSIVE))
continue;
gate = 0;
char gate_buf[INET_ADDRSTRLEN] = "NULL";
/*
* XXX We need to refrain from kernel operations in some cases,
* but this if statement seems overly cautious - what about
* other than ADD and DELETE?
*/
if ((cmd == RTM_ADD
&& CHECK_FLAG(nexthop->flags, NEXTHOP_FLAG_ACTIVE))
|| (cmd == RTM_DELETE
&& CHECK_FLAG(nexthop->flags, NEXTHOP_FLAG_FIB))) {
if (nexthop->type == NEXTHOP_TYPE_IPV4
|| nexthop->type == NEXTHOP_TYPE_IPV4_IFINDEX) {
sin_gate.sin_addr = nexthop->gate.ipv4;
gate = 1;
}
if (nexthop->type == NEXTHOP_TYPE_IFINDEX
|| nexthop->type == NEXTHOP_TYPE_IPV4_IFINDEX)
ifindex = nexthop->ifindex;
if (nexthop->type == NEXTHOP_TYPE_BLACKHOLE) {
struct in_addr loopback;
loopback.s_addr = htonl(INADDR_LOOPBACK);
sin_gate.sin_addr = loopback;
bh_type = nexthop->bh_type;
gate = 1;
}
if (gate && p->prefixlen == 32)
mask = NULL;
else {
masklen2ip(p->prefixlen, &sin_mask.sin_addr);
sin_mask.sin_family = AF_INET;
#ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN
sin_mask.sin_len =
sin_masklen(sin_mask.sin_addr);
#endif /* HAVE_STRUCT_SOCKADDR_IN_SIN_LEN */
mask = &sin_mask;
}
#ifdef __OpenBSD__
if (nexthop->nh_label
&& !kernel_rtm_add_labels(nexthop->nh_label,
&smpls))
continue;
smplsp = (union sockunion *)&smpls;
#endif
error = rtm_write(cmd, (union sockunion *)&sin_dest,
(union sockunion *)mask,
gate ? (union sockunion *)&sin_gate
: NULL,
smplsp, ifindex, bh_type, re->metric);
if (IS_ZEBRA_DEBUG_RIB) {
if (!gate) {
zlog_debug(
"%s: %s: attention! gate not found for re %p",
__func__, prefix_buf, re);
route_entry_dump(p, NULL, re);
} else
inet_ntop(AF_INET, &sin_gate.sin_addr,
gate_buf, INET_ADDRSTRLEN);
}
switch (error) {
/* We only flag nexthops as being in FIB if rtm_write()
* did its work. */
case ZEBRA_ERR_NOERROR:
nexthop_num++;
if (IS_ZEBRA_DEBUG_RIB)
zlog_debug(
"%s: %s: successfully did NH %s",
__func__, prefix_buf, gate_buf);
if (cmd == RTM_ADD)
SET_FLAG(nexthop->flags,
NEXTHOP_FLAG_FIB);
break;
/* The only valid case for this error is kernel's
* failure to install
* a multipath route, which is common for FreeBSD. This
* should be
* ignored silently, but logged as an error otherwise.
*/
case ZEBRA_ERR_RTEXIST:
if (cmd != RTM_ADD)
zlog_err(
"%s: rtm_write() returned %d for command %d",
__func__, error, cmd);
continue;
break;
/* Given that our NEXTHOP_FLAG_FIB matches real kernel
* FIB, it isn't
* normal to get any other messages in ANY case.
*/
case ZEBRA_ERR_RTNOEXIST:
case ZEBRA_ERR_RTUNREACH:
default:
zlog_err(
"%s: %s: rtm_write() unexpectedly returned %d for command %s",
__func__,
prefix2str(p, prefix_buf,
sizeof(prefix_buf)),
error,
lookup_msg(rtm_type_str, cmd, NULL));
break;
}
} /* if (cmd and flags make sense) */
else if (IS_ZEBRA_DEBUG_RIB)
zlog_debug("%s: odd command %s for flags %d", __func__,
lookup_msg(rtm_type_str, cmd, NULL),
nexthop->flags);
} /* for (ALL_NEXTHOPS(...))*/
/* If there was no useful nexthop, then complain. */
if (nexthop_num == 0 && IS_ZEBRA_DEBUG_KERNEL)
zlog_debug("%s: No useful nexthops were found in RIB entry %p",
__func__, re);
return 0; /*XXX*/
}
#ifdef SIN6_LEN
/* Calculate sin6_len value for netmask socket value. */
static int sin6_masklen(struct in6_addr mask)
{
struct sockaddr_in6 sin6;
char *p, *lim;
int len;
if (IN6_IS_ADDR_UNSPECIFIED(&mask))
return sizeof(long);
sin6.sin6_addr = mask;
len = sizeof(struct sockaddr_in6);
lim = (char *)&sin6.sin6_addr;
p = lim + sizeof(sin6.sin6_addr);
while (*--p == 0 && p >= lim)
len--;
return len;
}
#endif /* SIN6_LEN */
/* Interface between zebra message and rtm message. */
static int kernel_rtm_ipv6(int cmd, struct prefix *p, struct route_entry *re)
{
struct sockaddr_in6 *mask;
struct sockaddr_in6 sin_dest, sin_mask, sin_gate;
#ifdef __OpenBSD__
struct sockaddr_mpls smpls;
#endif
union sockunion *smplsp = NULL;
struct nexthop *nexthop;
int nexthop_num = 0;
ifindex_t ifindex = 0;
int gate = 0;
int error;
enum blackhole_type bh_type = BLACKHOLE_UNSPEC;
memset(&sin_dest, 0, sizeof(struct sockaddr_in6));
sin_dest.sin6_family = AF_INET6;
#ifdef SIN6_LEN
sin_dest.sin6_len = sizeof(struct sockaddr_in6);
#endif /* SIN6_LEN */
sin_dest.sin6_addr = p->u.prefix6;
memset(&sin_mask, 0, sizeof(struct sockaddr_in6));
memset(&sin_gate, 0, sizeof(struct sockaddr_in6));
sin_gate.sin6_family = AF_INET6;
#ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN
sin_gate.sin6_len = sizeof(struct sockaddr_in6);
#endif /* HAVE_STRUCT_SOCKADDR_IN_SIN_LEN */
/* Make gateway. */
for (ALL_NEXTHOPS(re->nexthop, nexthop)) {
if (CHECK_FLAG(nexthop->flags, NEXTHOP_FLAG_RECURSIVE))
continue;
gate = 0;
if ((cmd == RTM_ADD
&& CHECK_FLAG(nexthop->flags, NEXTHOP_FLAG_ACTIVE))
|| (cmd == RTM_DELETE
#if 0
&& CHECK_FLAG (nexthop->flags, NEXTHOP_FLAG_FIB)
#endif
)) {
if (nexthop->type == NEXTHOP_TYPE_IPV6
|| nexthop->type == NEXTHOP_TYPE_IPV6_IFINDEX) {
sin_gate.sin6_addr = nexthop->gate.ipv6;
gate = 1;
}
if (nexthop->type == NEXTHOP_TYPE_IFINDEX
|| nexthop->type == NEXTHOP_TYPE_IPV6_IFINDEX)
ifindex = nexthop->ifindex;
if (nexthop->type == NEXTHOP_TYPE_BLACKHOLE)
bh_type = nexthop->bh_type;
if (cmd == RTM_ADD)
SET_FLAG(nexthop->flags, NEXTHOP_FLAG_FIB);
}
/* Under kame set interface index to link local address. */
#ifdef KAME
#define SET_IN6_LINKLOCAL_IFINDEX(a, i) \
do { \
(a).s6_addr[2] = ((i) >> 8) & 0xff; \
(a).s6_addr[3] = (i)&0xff; \
} while (0)
if (gate && IN6_IS_ADDR_LINKLOCAL(&sin_gate.sin6_addr))
SET_IN6_LINKLOCAL_IFINDEX(sin_gate.sin6_addr, ifindex);
#endif /* KAME */
if (gate && p->prefixlen == 128)
mask = NULL;
else {
masklen2ip6(p->prefixlen, &sin_mask.sin6_addr);
sin_mask.sin6_family = AF_INET6;
#ifdef SIN6_LEN
sin_mask.sin6_len = sin6_masklen(sin_mask.sin6_addr);
#endif /* SIN6_LEN */
mask = &sin_mask;
}
#ifdef __OpenBSD__
if (nexthop->nh_label
&& !kernel_rtm_add_labels(nexthop->nh_label, &smpls))
continue;
smplsp = (union sockunion *)&smpls;
#endif
error = rtm_write(cmd, (union sockunion *)&sin_dest,
(union sockunion *)mask,
gate ? (union sockunion *)&sin_gate : NULL,
smplsp, ifindex, bh_type, re->metric);
#if 0
if (error)
{
zlog_info ("kernel_rtm_ipv6(): nexthop %d add error=%d.",
nexthop_num, error);
}
#else
(void)error;
#endif
nexthop_num++;
}
/* If there is no useful nexthop then return. */
if (nexthop_num == 0) {
if (IS_ZEBRA_DEBUG_KERNEL)
zlog_debug("kernel_rtm_ipv6(): No useful nexthop.");
return 0;
}
return 0; /*XXX*/
}
static int kernel_rtm(int cmd, struct prefix *p, struct route_entry *re)
{
switch (PREFIX_FAMILY(p)) {
case AF_INET:
return kernel_rtm_ipv4(cmd, p, re);
case AF_INET6:
return kernel_rtm_ipv6(cmd, p, re);
}
return 0;
}
int kernel_route_rib(struct prefix *p, struct prefix *src_p,
struct route_entry *old, struct route_entry *new)
{
int route = 0;
if (src_p && src_p->prefixlen) {
zlog_err("route add: IPv6 sourcedest routes unsupported!");
return 1;
}
if (zserv_privs.change(ZPRIVS_RAISE))
zlog_err("Can't raise privileges");
if (old)
route |= kernel_rtm(RTM_DELETE, p, old);
if (new)
route |= kernel_rtm(RTM_ADD, p, new);
if (zserv_privs.change(ZPRIVS_LOWER))
zlog_err("Can't lower privileges");
return route;
}
int kernel_neigh_update(int add, int ifindex, uint32_t addr, char *lla,
int llalen)
{
/* TODO */
return 0;
}
extern int kernel_get_ipmr_sg_stats(struct zebra_vrf *zvrf, void *mroute)
{
return 0;
}
int kernel_add_vtep(vni_t vni, struct interface *ifp, struct in_addr *vtep_ip)
{
return 0;
}
int kernel_del_vtep(vni_t vni, struct interface *ifp, struct in_addr *vtep_ip)
{
return 0;
}
int kernel_add_mac(struct interface *ifp, vlanid_t vid, struct ethaddr *mac,
struct in_addr vtep_ip, u_char sticky)
{
return 0;
}
int kernel_del_mac(struct interface *ifp, vlanid_t vid, struct ethaddr *mac,
struct in_addr vtep_ip, int local)
{
return 0;
}
int kernel_add_neigh(struct interface *ifp, struct ipaddr *ip,
struct ethaddr *mac)
{
return 0;
}
int kernel_del_neigh(struct interface *ifp, struct ipaddr *ip)
{
return 0;
}
extern int kernel_interface_set_master(struct interface *master,
struct interface *slave)
{
return 0;
}
#endif /* !HAVE_NETLINK */
|