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559 lines
13 KiB
C
559 lines
13 KiB
C
/*
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* kernel routing table update by ioctl().
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* Copyright (C) 1997, 98 Kunihiro Ishiguro
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*
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* This file is part of GNU Zebra.
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*
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* GNU Zebra is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2, or (at your option) any
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* later version.
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*
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* GNU Zebra is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GNU Zebra; see the file COPYING. If not, write to the Free
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* Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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* 02111-1307, USA.
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*/
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#include <zebra.h>
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#include "prefix.h"
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#include "log.h"
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#include "if.h"
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#include "zebra/rib.h"
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#include "zebra/debug.h"
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/* Initialize of kernel interface. There is no kernel communication
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support under ioctl(). So this is dummy stub function. */
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void
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kernel_init ()
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{
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return;
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}
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/* Dummy function of routing socket. */
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void
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kernel_read (int sock)
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{
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return;
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}
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#if 0
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/* Initialization prototype of struct sockaddr_in. */
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static struct sockaddr_in sin_proto =
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{
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#ifdef HAVE_SIN_LEN
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sizeof (struct sockaddr_in),
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#endif /* HAVE_SIN_LEN */
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AF_INET, 0, {0}, {0}
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};
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#endif /* 0 */
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/* Solaris has ortentry. */
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#ifdef HAVE_OLD_RTENTRY
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#define rtentry ortentry
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#endif /* HAVE_OLD_RTENTRY */
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/* Interface to ioctl route message. */
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int
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kernel_add_route (struct prefix_ipv4 *dest, struct in_addr *gate,
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int index, int flags)
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{
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int ret;
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int sock;
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struct rtentry rtentry;
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struct sockaddr_in sin_dest, sin_mask, sin_gate;
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memset (&rtentry, 0, sizeof (struct rtentry));
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/* Make destination. */
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memset (&sin_dest, 0, sizeof (struct sockaddr_in));
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sin_dest.sin_family = AF_INET;
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#ifdef HAVE_SIN_LEN
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sin_dest.sin_len = sizeof (struct sockaddr_in);
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#endif /* HAVE_SIN_LEN */
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sin_dest.sin_addr = dest->prefix;
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/* Make gateway. */
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if (gate)
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{
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memset (&sin_gate, 0, sizeof (struct sockaddr_in));
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sin_gate.sin_family = AF_INET;
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#ifdef HAVE_SIN_LEN
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sin_gate.sin_len = sizeof (struct sockaddr_in);
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#endif /* HAVE_SIN_LEN */
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sin_gate.sin_addr = *gate;
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}
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memset (&sin_mask, 0, sizeof (struct sockaddr_in));
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sin_mask.sin_family = AF_INET;
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#ifdef HAVE_SIN_LEN
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sin_gate.sin_len = sizeof (struct sockaddr_in);
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#endif /* HAVE_SIN_LEN */
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masklen2ip (dest->prefixlen, &sin_mask.sin_addr);
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/* Set destination address, mask and gateway.*/
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memcpy (&rtentry.rt_dst, &sin_dest, sizeof (struct sockaddr_in));
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if (gate)
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memcpy (&rtentry.rt_gateway, &sin_gate, sizeof (struct sockaddr_in));
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#ifndef SUNOS_5
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memcpy (&rtentry.rt_genmask, &sin_mask, sizeof (struct sockaddr_in));
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#endif /* SUNOS_5 */
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/* Routing entry flag set. */
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if (dest->prefixlen == 32)
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rtentry.rt_flags |= RTF_HOST;
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if (gate && gate->s_addr != INADDR_ANY)
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rtentry.rt_flags |= RTF_GATEWAY;
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rtentry.rt_flags |= RTF_UP;
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/* Additional flags */
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rtentry.rt_flags |= flags;
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/* For tagging route. */
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/* rtentry.rt_flags |= RTF_DYNAMIC; */
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/* Open socket for ioctl. */
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sock = socket (AF_INET, SOCK_DGRAM, 0);
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if (sock < 0)
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{
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zlog_warn ("can't make socket\n");
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return -1;
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}
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/* Send message by ioctl(). */
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ret = ioctl (sock, SIOCADDRT, &rtentry);
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if (ret < 0)
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{
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switch (errno)
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{
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case EEXIST:
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close (sock);
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return ZEBRA_ERR_RTEXIST;
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break;
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case ENETUNREACH:
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close (sock);
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return ZEBRA_ERR_RTUNREACH;
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break;
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case EPERM:
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close (sock);
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return ZEBRA_ERR_EPERM;
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break;
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}
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close (sock);
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zlog_warn ("write : %s (%d)", strerror (errno), errno);
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return 1;
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}
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close (sock);
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return ret;
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}
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/* Interface to ioctl route message. */
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int
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kernel_ioctl_ipv4 (u_long cmd, struct prefix *p, struct rib *rib, int family)
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{
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int ret;
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int sock;
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struct rtentry rtentry;
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struct sockaddr_in sin_dest, sin_mask, sin_gate;
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struct nexthop *nexthop;
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int nexthop_num = 0;
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struct interface *ifp;
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memset (&rtentry, 0, sizeof (struct rtentry));
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/* Make destination. */
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memset (&sin_dest, 0, sizeof (struct sockaddr_in));
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sin_dest.sin_family = AF_INET;
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#ifdef HAVE_SIN_LEN
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sin_dest.sin_len = sizeof (struct sockaddr_in);
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#endif /* HAVE_SIN_LEN */
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sin_dest.sin_addr = p->u.prefix4;
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if (CHECK_FLAG (rib->flags, ZEBRA_FLAG_BLACKHOLE))
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{
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SET_FLAG (rtentry.rt_flags, RTF_REJECT);
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if (cmd == SIOCADDRT)
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for (nexthop = rib->nexthop; nexthop; nexthop = nexthop->next)
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SET_FLAG (nexthop->flags, NEXTHOP_FLAG_FIB);
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goto skip;
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}
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memset (&sin_gate, 0, sizeof (struct sockaddr_in));
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/* Make gateway. */
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for (nexthop = rib->nexthop; nexthop; nexthop = nexthop->next)
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{
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if ((cmd == SIOCADDRT
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&& CHECK_FLAG (nexthop->flags, NEXTHOP_FLAG_ACTIVE))
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|| (cmd == SIOCDELRT
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&& CHECK_FLAG (nexthop->flags, NEXTHOP_FLAG_FIB)))
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{
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if (CHECK_FLAG (nexthop->flags, NEXTHOP_FLAG_RECURSIVE))
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{
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if (nexthop->rtype == NEXTHOP_TYPE_IPV4 ||
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nexthop->rtype == NEXTHOP_TYPE_IPV4_IFINDEX)
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{
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sin_gate.sin_family = AF_INET;
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#ifdef HAVE_SIN_LEN
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sin_gate.sin_len = sizeof (struct sockaddr_in);
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#endif /* HAVE_SIN_LEN */
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sin_gate.sin_addr = nexthop->rgate.ipv4;
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rtentry.rt_flags |= RTF_GATEWAY;
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}
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if (nexthop->rtype == NEXTHOP_TYPE_IFINDEX
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|| nexthop->rtype == NEXTHOP_TYPE_IFNAME)
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{
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ifp = if_lookup_by_index (nexthop->rifindex);
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if (ifp)
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rtentry.rt_dev = ifp->name;
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else
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return -1;
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}
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}
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else
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{
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if (nexthop->type == NEXTHOP_TYPE_IPV4 ||
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nexthop->type == NEXTHOP_TYPE_IPV4_IFINDEX)
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{
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sin_gate.sin_family = AF_INET;
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#ifdef HAVE_SIN_LEN
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sin_gate.sin_len = sizeof (struct sockaddr_in);
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#endif /* HAVE_SIN_LEN */
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sin_gate.sin_addr = nexthop->gate.ipv4;
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rtentry.rt_flags |= RTF_GATEWAY;
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}
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if (nexthop->type == NEXTHOP_TYPE_IFINDEX
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|| nexthop->type == NEXTHOP_TYPE_IFNAME)
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{
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ifp = if_lookup_by_index (nexthop->ifindex);
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if (ifp)
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rtentry.rt_dev = ifp->name;
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else
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return -1;
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}
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}
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if (cmd == SIOCADDRT)
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SET_FLAG (nexthop->flags, NEXTHOP_FLAG_FIB);
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nexthop_num++;
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break;
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}
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}
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/* If there is no useful nexthop then return. */
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if (nexthop_num == 0)
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{
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if (IS_ZEBRA_DEBUG_KERNEL)
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zlog_info ("netlink_route_multipath(): No useful nexthop.");
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return 0;
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}
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skip:
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memset (&sin_mask, 0, sizeof (struct sockaddr_in));
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sin_mask.sin_family = AF_INET;
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#ifdef HAVE_SIN_LEN
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sin_mask.sin_len = sizeof (struct sockaddr_in);
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#endif /* HAVE_SIN_LEN */
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masklen2ip (p->prefixlen, &sin_mask.sin_addr);
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/* Set destination address, mask and gateway.*/
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memcpy (&rtentry.rt_dst, &sin_dest, sizeof (struct sockaddr_in));
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if (rtentry.rt_flags & RTF_GATEWAY)
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memcpy (&rtentry.rt_gateway, &sin_gate, sizeof (struct sockaddr_in));
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#ifndef SUNOS_5
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memcpy (&rtentry.rt_genmask, &sin_mask, sizeof (struct sockaddr_in));
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#endif /* SUNOS_5 */
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/* Metric. It seems metric minus one value is installed... */
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rtentry.rt_metric = rib->metric;
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/* Routing entry flag set. */
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if (p->prefixlen == 32)
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rtentry.rt_flags |= RTF_HOST;
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rtentry.rt_flags |= RTF_UP;
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/* Additional flags */
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/* rtentry.rt_flags |= flags; */
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/* For tagging route. */
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/* rtentry.rt_flags |= RTF_DYNAMIC; */
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/* Open socket for ioctl. */
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sock = socket (AF_INET, SOCK_DGRAM, 0);
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if (sock < 0)
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{
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zlog_warn ("can't make socket\n");
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return -1;
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}
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/* Send message by ioctl(). */
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ret = ioctl (sock, cmd, &rtentry);
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if (ret < 0)
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{
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switch (errno)
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{
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case EEXIST:
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close (sock);
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return ZEBRA_ERR_RTEXIST;
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break;
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case ENETUNREACH:
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close (sock);
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return ZEBRA_ERR_RTUNREACH;
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break;
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case EPERM:
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close (sock);
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return ZEBRA_ERR_EPERM;
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break;
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}
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close (sock);
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zlog_warn ("write : %s (%d)", strerror (errno), errno);
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return ret;
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}
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close (sock);
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return ret;
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}
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int
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kernel_add_ipv4 (struct prefix *p, struct rib *rib)
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{
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return kernel_ioctl_ipv4 (SIOCADDRT, p, rib, AF_INET);
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}
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int
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kernel_delete_ipv4 (struct prefix *p, struct rib *rib)
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{
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return kernel_ioctl_ipv4 (SIOCDELRT, p, rib, AF_INET);
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}
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#ifdef HAVE_IPV6
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/* Below is hack for GNU libc definition and Linux 2.1.X header. */
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#undef RTF_DEFAULT
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#undef RTF_ADDRCONF
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#include <asm/types.h>
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#if defined(__GLIBC__) && __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 1
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/* struct in6_rtmsg will be declared in net/route.h. */
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#else
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#include <linux/ipv6_route.h>
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#endif
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int
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kernel_ioctl_ipv6 (u_long type, struct prefix_ipv6 *dest, struct in6_addr *gate,
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int index, int flags)
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{
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int ret;
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int sock;
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struct in6_rtmsg rtm;
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memset (&rtm, 0, sizeof (struct in6_rtmsg));
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rtm.rtmsg_flags |= RTF_UP;
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rtm.rtmsg_metric = 1;
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memcpy (&rtm.rtmsg_dst, &dest->prefix, sizeof (struct in6_addr));
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rtm.rtmsg_dst_len = dest->prefixlen;
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/* We need link local index. But this should be done caller...
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if (IN6_IS_ADDR_LINKLOCAL(&rtm.rtmsg_gateway))
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{
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index = if_index_address (&rtm.rtmsg_gateway);
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rtm.rtmsg_ifindex = index;
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}
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else
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rtm.rtmsg_ifindex = 0;
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*/
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rtm.rtmsg_flags |= RTF_GATEWAY;
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/* For tagging route. */
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/* rtm.rtmsg_flags |= RTF_DYNAMIC; */
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memcpy (&rtm.rtmsg_gateway, gate, sizeof (struct in6_addr));
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if (index)
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rtm.rtmsg_ifindex = index;
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else
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rtm.rtmsg_ifindex = 0;
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rtm.rtmsg_metric = 1;
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sock = socket (AF_INET6, SOCK_DGRAM, 0);
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if (sock < 0)
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{
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zlog_warn ("can't make socket\n");
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return -1;
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}
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/* Send message via ioctl. */
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ret = ioctl (sock, type, &rtm);
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if (ret < 0)
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{
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zlog_warn ("can't %s ipv6 route: %s\n", type == SIOCADDRT ? "add" : "delete",
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strerror(errno));
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ret = errno;
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close (sock);
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return ret;
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}
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close (sock);
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return ret;
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}
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int
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kernel_ioctl_ipv6_multipath (u_long cmd, struct prefix *p, struct rib *rib,
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int family)
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{
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int ret;
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int sock;
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struct in6_rtmsg rtm;
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struct nexthop *nexthop;
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int nexthop_num = 0;
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memset (&rtm, 0, sizeof (struct in6_rtmsg));
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rtm.rtmsg_flags |= RTF_UP;
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rtm.rtmsg_metric = rib->metric;
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memcpy (&rtm.rtmsg_dst, &p->u.prefix, sizeof (struct in6_addr));
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rtm.rtmsg_dst_len = p->prefixlen;
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/* We need link local index. But this should be done caller...
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if (IN6_IS_ADDR_LINKLOCAL(&rtm.rtmsg_gateway))
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{
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index = if_index_address (&rtm.rtmsg_gateway);
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rtm.rtmsg_ifindex = index;
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}
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else
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rtm.rtmsg_ifindex = 0;
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*/
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rtm.rtmsg_flags |= RTF_GATEWAY;
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/* For tagging route. */
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/* rtm.rtmsg_flags |= RTF_DYNAMIC; */
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/* Make gateway. */
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for (nexthop = rib->nexthop; nexthop; nexthop = nexthop->next)
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{
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if ((cmd == SIOCADDRT
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&& CHECK_FLAG (nexthop->flags, NEXTHOP_FLAG_ACTIVE))
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|| (cmd == SIOCDELRT
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&& CHECK_FLAG (nexthop->flags, NEXTHOP_FLAG_FIB)))
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{
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if (CHECK_FLAG (nexthop->flags, NEXTHOP_FLAG_RECURSIVE))
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{
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if (nexthop->rtype == NEXTHOP_TYPE_IPV6
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|| nexthop->rtype == NEXTHOP_TYPE_IPV6_IFNAME
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|| nexthop->rtype == NEXTHOP_TYPE_IPV6_IFINDEX)
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{
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memcpy (&rtm.rtmsg_gateway, &nexthop->rgate.ipv6,
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sizeof (struct in6_addr));
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}
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if (nexthop->rtype == NEXTHOP_TYPE_IFINDEX
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|| nexthop->rtype == NEXTHOP_TYPE_IFNAME
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|| nexthop->rtype == NEXTHOP_TYPE_IPV6_IFNAME
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|| nexthop->rtype == NEXTHOP_TYPE_IPV6_IFINDEX)
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rtm.rtmsg_ifindex = nexthop->rifindex;
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else
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rtm.rtmsg_ifindex = 0;
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}
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else
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{
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if (nexthop->type == NEXTHOP_TYPE_IPV6
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|| nexthop->type == NEXTHOP_TYPE_IPV6_IFNAME
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|| nexthop->type == NEXTHOP_TYPE_IPV6_IFINDEX)
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{
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memcpy (&rtm.rtmsg_gateway, &nexthop->gate.ipv6,
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sizeof (struct in6_addr));
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}
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if (nexthop->type == NEXTHOP_TYPE_IFINDEX
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|| nexthop->type == NEXTHOP_TYPE_IFNAME
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|| nexthop->type == NEXTHOP_TYPE_IPV6_IFNAME
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|| nexthop->type == NEXTHOP_TYPE_IPV6_IFINDEX)
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rtm.rtmsg_ifindex = nexthop->ifindex;
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else
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rtm.rtmsg_ifindex = 0;
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}
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if (cmd == SIOCADDRT)
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SET_FLAG (nexthop->flags, NEXTHOP_FLAG_FIB);
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nexthop_num++;
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break;
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}
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}
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/* If there is no useful nexthop then return. */
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if (nexthop_num == 0)
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{
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if (IS_ZEBRA_DEBUG_KERNEL)
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zlog_info ("netlink_route_multipath(): No useful nexthop.");
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return 0;
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}
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sock = socket (AF_INET6, SOCK_DGRAM, 0);
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if (sock < 0)
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{
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zlog_warn ("can't make socket\n");
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return -1;
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}
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/* Send message via ioctl. */
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||
ret = ioctl (sock, cmd, &rtm);
|
||
if (ret < 0)
|
||
{
|
||
zlog_warn ("can't %s ipv6 route: %s\n",
|
||
cmd == SIOCADDRT ? "add" : "delete",
|
||
strerror(errno));
|
||
ret = errno;
|
||
close (sock);
|
||
return ret;
|
||
}
|
||
close (sock);
|
||
|
||
return ret;
|
||
}
|
||
|
||
int
|
||
kernel_add_ipv6 (struct prefix *p, struct rib *rib)
|
||
{
|
||
return kernel_ioctl_ipv6_multipath (SIOCADDRT, p, rib, AF_INET6);
|
||
}
|
||
|
||
int
|
||
kernel_delete_ipv6 (struct prefix *p, struct rib *rib)
|
||
{
|
||
return kernel_ioctl_ipv6_multipath (SIOCDELRT, p, rib, AF_INET6);
|
||
}
|
||
|
||
/* Delete IPv6 route from the kernel. */
|
||
int
|
||
kernel_delete_ipv6_old (struct prefix_ipv6 *dest, struct in6_addr *gate,
|
||
int index, int flags, int table)
|
||
{
|
||
return kernel_ioctl_ipv6 (SIOCDELRT, dest, gate, index, flags);
|
||
}
|
||
#endif /* HAVE_IPV6 */
|