freebsd-dev/usr.sbin/rtsold/rtsock.c
Hiroki Sato db82af41db - Implement RDNSS and DNSSL options (RFC 6106, IPv6 Router Advertisement
Options for DNS Configuration) into rtadvd(8) and rtsold(8).  DNS
  information received by rtsold(8) will go to resolv.conf(5) by
  resolvconf(8) script.  This is based on work by J.R. Oldroyd (kern/156259)
  but revised extensively[1].

- rtadvd(8) now supports "noifprefix" to disable gathering on-link prefixes
  from interfaces when no "addr" is specified[2].  An entry in rtadvd.conf
  with "noifprefix" + no "addr" generates an RA message with no prefix
  information option.

- rtadvd(8) now supports RTM_IFANNOUNCE message to fix crashes when an
  interface is added or removed.

- Correct bogus ND_OPT_ROUTE_INFO value to one in RFC 4191.

Reviewed by:	bz[1]
PR:		kern/156259 [1]
PR:		bin/152458 [2]
2011-06-06 03:06:43 +00:00

176 lines
4.6 KiB
C

/* $KAME: rtsock.c,v 1.3 2000/10/10 08:46:45 itojun Exp $ */
/* $FreeBSD$ */
/*
* Copyright (C) 2000 WIDE Project.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the project nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS 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/param.h>
#include <sys/socket.h>
#include <sys/uio.h>
#include <sys/time.h>
#include <sys/queue.h>
#include <net/if.h>
#include <net/route.h>
#include <net/if_dl.h>
#include <netinet/in.h>
#include <netinet/ip6.h>
#include <netinet/icmp6.h>
#include <time.h>
#include <unistd.h>
#include <stdio.h>
#include <stddef.h>
#include <err.h>
#include <errno.h>
#include <string.h>
#include <stdlib.h>
#include <syslog.h>
#include "rtsold.h"
#define ROUNDUP(a, size) \
(((a) & ((size)-1)) ? (1 + ((a) | ((size)-1))) : (a))
#define NEXT_SA(ap) (ap) = (struct sockaddr *) \
((caddr_t)(ap) + \
((ap)->sa_len ? ROUNDUP((ap)->sa_len, sizeof(u_long)) \
: sizeof(u_long)))
#ifdef RTM_IFANNOUNCE /*NetBSD 1.5 or later*/
static int rtsock_input_ifannounce(int, struct rt_msghdr *, char *);
#endif
static struct {
u_char type;
size_t minlen;
int (*func)(int, struct rt_msghdr *, char *);
} rtsock_dispatch[] = {
#ifdef RTM_IFANNOUNCE /*NetBSD 1.5 or later*/
{ RTM_IFANNOUNCE, sizeof(struct if_announcemsghdr),
rtsock_input_ifannounce },
#endif
{ 0, 0, NULL },
};
int
rtsock_open(void)
{
return (socket(PF_ROUTE, SOCK_RAW, 0));
}
int
rtsock_input(int s)
{
ssize_t n;
char msg[2048];
char *lim, *next;
struct rt_msghdr *rtm;
int idx;
ssize_t len;
int ret = 0;
const ssize_t lenlim =
offsetof(struct rt_msghdr, rtm_msglen) + sizeof(rtm->rtm_msglen);
n = read(s, msg, sizeof(msg));
lim = msg + n;
for (next = msg; next < lim; next += len) {
rtm = (struct rt_msghdr *)next;
if (lim - next < lenlim)
break;
len = rtm->rtm_msglen;
if (len < lenlim)
break;
if (dflag > 1) {
warnmsg(LOG_INFO, __func__,
"rtmsg type %d, len=%lu", rtm->rtm_type,
(u_long)len);
}
for (idx = 0; rtsock_dispatch[idx].func; idx++) {
if (rtm->rtm_type != rtsock_dispatch[idx].type)
continue;
if (rtm->rtm_msglen < rtsock_dispatch[idx].minlen) {
warnmsg(LOG_INFO, __func__,
"rtmsg type %d too short!", rtm->rtm_type);
continue;
}
ret = (*rtsock_dispatch[idx].func)(s, rtm, lim);
break;
}
}
return (ret);
}
#ifdef RTM_IFANNOUNCE /*NetBSD 1.5 or later*/
static int
rtsock_input_ifannounce(int s __unused, struct rt_msghdr *rtm, char *lim)
{
struct if_announcemsghdr *ifan;
struct ifinfo *ifinfo;
ifan = (struct if_announcemsghdr *)rtm;
if ((char *)(ifan + 1) > lim)
return (-1);
switch (ifan->ifan_what) {
case IFAN_ARRIVAL:
/*
* XXX for NetBSD 1.5, interface index will monotonically be
* increased as new pcmcia card gets inserted.
* we may be able to do a name-based interface match,
* and call ifreconfig() to enable the interface again.
*/
warnmsg(LOG_INFO, __func__,
"interface %s inserted", ifan->ifan_name);
break;
case IFAN_DEPARTURE:
warnmsg(LOG_WARNING, __func__,
"interface %s removed", ifan->ifan_name);
ifinfo = find_ifinfo(ifan->ifan_index);
if (ifinfo) {
if (dflag > 1) {
warnmsg(LOG_INFO, __func__,
"bring interface %s to DOWN state",
ifan->ifan_name);
}
ifinfo->state = IFS_DOWN;
}
break;
}
return (0);
}
#endif