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/*
*
* Copyright (C) 2000 Robert Olsson.
* Swedish University of Agricultural Sciences
*
* 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 GNU Zebra; see the file COPYING. If not, write to the Free
* Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
* 02111-1307, USA.
*/
/*
* This work includes work with the following copywrite:
*
* Copyright (C) 1997, 2000 Kunihiro Ishiguro
*
*/
/*
* Thanks to Jens Ls at Swedish University of Agricultural Sciences
* for reviewing and tests.
*/
#include <zebra.h>
#ifdef HAVE_IRDP
#include "if.h"
#include "vty.h"
#include "sockunion.h"
#include "sockopt.h"
#include "prefix.h"
#include "command.h"
#include "memory.h"
#include "stream.h"
#include "ioctl.h"
#include "connected.h"
#include "log.h"
#include "zclient.h"
#include "thread.h"
#include "privs.h"
#include "zebra/interface.h"
#include "zebra/rtadv.h"
#include "zebra/rib.h"
#include "zebra/zserv.h"
#include "zebra/redistribute.h"
#include "zebra/irdp.h"
#include <netinet/ip_icmp.h>
#include "if.h"
#include "sockunion.h"
#include "log.h"
/* GLOBAL VARS */
extern struct zebra_privs_t zserv_privs;
/* Master of threads. */
extern struct zebra_t zebrad;
struct thread *t_irdp_raw;
/* Timer interval of irdp. */
int irdp_timer_interval = IRDP_DEFAULT_INTERVAL;
int irdp_read_raw(struct thread *r);
int in_cksum (void *ptr, int nbytes);
extern int irdp_sock;
void send_packet(struct interface *ifp,
struct stream *s,
u_int32_t dst,
struct prefix *p,
u_int32_t ttl);
void irdp_if_init ();
char *
inet_2a(u_int32_t a, char *b)
{
sprintf(b, "%u.%u.%u.%u",
(a ) & 0xFF,
(a>> 8) & 0xFF,
(a>>16) & 0xFF,
(a>>24) & 0xFF);
return b;
}
int
irdp_sock_init (void)
{
int ret, i;
int save_errno;
if ( zserv_privs.change (ZPRIVS_RAISE) )
zlog_err ("irdp_sock_init: could not raise privs, %s",
safe_strerror (errno) );
irdp_sock = socket (AF_INET, SOCK_RAW, IPPROTO_ICMP);
save_errno = errno;
if ( zserv_privs.change (ZPRIVS_LOWER) )
zlog_err ("irdp_sock_init: could not lower privs, %s",
safe_strerror (errno) );
if (irdp_sock < 0) {
zlog_warn ("IRDP: can't create irdp socket %s", safe_strerror(save_errno));
return irdp_sock;
};
i = 1;
ret = setsockopt (irdp_sock, IPPROTO_IP, IP_TTL,
(void *) &i, sizeof (i));
if (ret < 0) {
zlog_warn ("IRDP: can't do irdp sockopt %s", safe_strerror(errno));
return ret;
};
ret = setsockopt_ifindex (AF_INET, irdp_sock, 1);
if (ret < 0) {
zlog_warn ("IRDP: can't do irdp sockopt %s", safe_strerror(errno));
return ret;
};
t_irdp_raw = thread_add_read (zebrad.master, irdp_read_raw, NULL, irdp_sock);
return irdp_sock;
}
int get_pref(struct irdp_interface *irdp, struct prefix *p)
{
struct listnode *node;
struct Adv *adv;
/* Use default preference or use the override pref */
if( irdp->AdvPrefList == NULL )
return irdp->Preference;
LIST_LOOP (irdp->AdvPrefList, adv, node)
if( p->u.prefix4.s_addr == adv->ip.s_addr )
return adv->pref;
return irdp->Preference;
}
/* Make ICMP Router Advertisement Message. */
int make_advertisement_packet (struct interface *ifp,
struct prefix *p,
struct stream *s)
{
struct zebra_if *zi=ifp->info;
struct irdp_interface *irdp=&zi->irdp;
int size;
int pref;
u_int16_t checksum;
pref = get_pref(irdp, p);
stream_putc (s, ICMP_ROUTERADVERT); /* Type. */
stream_putc (s, 0); /* Code. */
stream_putw (s, 0); /* Checksum. */
stream_putc (s, 1); /* Num address. */
stream_putc (s, 2); /* Address Entry Size. */
if(irdp->flags & IF_SHUTDOWN)
stream_putw (s, 0);
else
stream_putw (s, irdp->Lifetime);
stream_putl (s, htonl(p->u.prefix4.s_addr)); /* Router address. */
stream_putl (s, pref);
/* in_cksum return network byte order value */
size = 16;
checksum = in_cksum (s->data, size);
stream_putw_at (s, 2, htons(checksum));
return size;
}
void irdp_send(struct interface *ifp,
struct prefix *p,
struct stream *s)
{
struct zebra_if *zi=ifp->info;
struct irdp_interface *irdp=&zi->irdp;
u_int32_t dst;
u_int32_t ttl=1;
if (! (ifp->flags & IFF_UP)) return;
if (irdp->flags & IF_BROADCAST)
dst =INADDR_BROADCAST ;
else
dst = htonl(INADDR_ALLHOSTS_GROUP);
if(irdp->flags & IF_DEBUG_MESSAGES)
zlog_debug("IRDP: TX Advert on %s %s/%d Holdtime=%d Preference=%d",
ifp->name,
inet_ntoa(p->u.prefix4),
p->prefixlen,
irdp->flags & IF_SHUTDOWN? 0 : irdp->Lifetime,
get_pref(irdp, p));
send_packet (ifp, s, dst, p, ttl);
}
void irdp_advertisement (struct interface *ifp,
struct prefix *p)
{
struct stream *s;
s = stream_new (128);
make_advertisement_packet (ifp, p, s);
irdp_send(ifp, p, s);
}
int irdp_send_thread(struct thread *t_advert)
{
u_int32_t timer, tmp;
struct interface *ifp = THREAD_ARG (t_advert);
struct zebra_if *zi=ifp->info;
struct irdp_interface *irdp=&zi->irdp;
struct prefix *p;
struct listnode *node;
struct connected *ifc;
irdp->flags &= ~IF_SOLICIT;
if(ifp->connected)
LIST_LOOP (ifp->connected, ifc, node)
{
p = ifc->address;
irdp_advertisement(ifp, p);
irdp->irdp_sent++;
}
tmp = irdp->MaxAdvertInterval-irdp->MinAdvertInterval;
timer = (random () % tmp ) + 1;
timer = irdp->MinAdvertInterval + timer;
if(irdp->irdp_sent < MAX_INITIAL_ADVERTISEMENTS &&
timer > MAX_INITIAL_ADVERT_INTERVAL )
timer= MAX_INITIAL_ADVERT_INTERVAL;
if(irdp->flags & IF_DEBUG_MISC)
zlog_debug("IRDP: New timer for %s set to %u\n", ifp->name, timer);
irdp->t_advertise = thread_add_timer(zebrad.master, irdp_send_thread, ifp, timer);
return 0;
}
void irdp_advert_off(struct interface *ifp)
{
struct zebra_if *zi=ifp->info;
struct irdp_interface *irdp=&zi->irdp;
struct listnode *node;
int i;
struct connected *ifc;
struct prefix *p;
if(irdp->t_advertise) thread_cancel(irdp->t_advertise);
irdp->t_advertise = NULL;
if(ifp->connected)
LIST_LOOP (ifp->connected, ifc, node)
{
p = ifc->address;
/* Output some packets with Lifetime 0
we should add a wait...
*/
for(i=0; i< IRDP_LAST_ADVERT_MESSAGES; i++)
{
irdp->irdp_sent++;
irdp_advertisement(ifp, p);
}
}
}
void process_solicit (struct interface *ifp)
{
struct zebra_if *zi=ifp->info;
struct irdp_interface *irdp=&zi->irdp;
u_int32_t timer;
/* When SOLICIT is active we reject further incoming solicits
this keeps down the answering rate so we don't have think
about DoS attacks here. */
if( irdp->flags & IF_SOLICIT) return;
irdp->flags |= IF_SOLICIT;
if(irdp->t_advertise) thread_cancel(irdp->t_advertise);
irdp->t_advertise = NULL;
timer = (random () % MAX_RESPONSE_DELAY) + 1;
irdp->t_advertise = thread_add_timer(zebrad.master,
irdp_send_thread,
ifp,
timer);
}
void irdp_finish()
{
struct listnode *node;
struct interface *ifp;
struct zebra_if *zi;
struct irdp_interface *irdp;
zlog_info("IRDP: Received shutdown notification.");
for (node = listhead (iflist); node; node = nextnode (node))
{
ifp = getdata(node);
zi = ifp->info;
if (!zi)
continue;
irdp = &zi->irdp;
if (!irdp)
continue;
if (irdp->flags & IF_ACTIVE )
{
irdp->flags |= IF_SHUTDOWN;
irdp_advert_off(ifp);
}
}
}
void irdp_init()
{
irdp_sock_init();
irdp_if_init ();
}
#endif /* HAVE_IRDP */
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