sys-bsd.c

unix and linux net driver

    return 1;
}

/*
 * cifaddr - Clear the interface IP addresses, and delete routes
 * through the interface if possible.
 */
int
cifaddr(u, o, h)
    int u;
    u_int32_t o, h;
{
    struct ifaliasreq ifra;

    ifaddrs[0] = 0;
    strlcpy(ifra.ifra_name, ifname, sizeof(ifra.ifra_name));
    SET_SA_FAMILY(ifra.ifra_addr, AF_INET);
    ((struct sockaddr_in *) &ifra.ifra_addr)->sin_addr.s_addr = o;
    SET_SA_FAMILY(ifra.ifra_broadaddr, AF_INET);
    ((struct sockaddr_in *) &ifra.ifra_broadaddr)->sin_addr.s_addr = h;
    BZERO(&ifra.ifra_mask, sizeof(ifra.ifra_mask));
    if (ioctl(sockfd, SIOCDIFADDR, (caddr_t) &ifra) < 0) {
	if (errno != EADDRNOTAVAIL)
	    warn("Couldn't delete interface address: %m");
	return 0;
    }
    return 1;
}

/*
 * sifdefaultroute - assign a default route through the address given.
 */
int
sifdefaultroute(u, l, g)
    int u;
    u_int32_t l, g;
{
    return dodefaultroute(g, 's');
}

/*
 * cifdefaultroute - delete a default route through the address given.
 */
int
cifdefaultroute(u, l, g)
    int u;
    u_int32_t l, g;
{
    return dodefaultroute(g, 'c');
}

/*
 * dodefaultroute - talk to a routing socket to add/delete a default route.
 */
static int
dodefaultroute(g, cmd)
    u_int32_t g;
    int cmd;
{
    int routes;
    struct {
	struct rt_msghdr	hdr;
	struct sockaddr_in	dst;
	struct sockaddr_in	gway;
	struct sockaddr_in	mask;
    } rtmsg;

    if ((routes = socket(PF_ROUTE, SOCK_RAW, AF_INET)) < 0) {
	error("Couldn't %s default route: socket: %m",
	       cmd=='s'? "add": "delete");
	return 0;
    }

    memset(&rtmsg, 0, sizeof(rtmsg));
    rtmsg.hdr.rtm_type = cmd == 's'? RTM_ADD: RTM_DELETE;
    rtmsg.hdr.rtm_flags = RTF_UP | RTF_GATEWAY | RTF_STATIC;
    rtmsg.hdr.rtm_version = RTM_VERSION;
    rtmsg.hdr.rtm_seq = ++rtm_seq;
    rtmsg.hdr.rtm_addrs = RTA_DST | RTA_GATEWAY | RTA_NETMASK;
    rtmsg.dst.sin_len = sizeof(rtmsg.dst);
    rtmsg.dst.sin_family = AF_INET;
    rtmsg.gway.sin_len = sizeof(rtmsg.gway);
    rtmsg.gway.sin_family = AF_INET;
    rtmsg.gway.sin_addr.s_addr = g;
    rtmsg.mask.sin_len = sizeof(rtmsg.dst);
    rtmsg.mask.sin_family = AF_INET;

    rtmsg.hdr.rtm_msglen = sizeof(rtmsg);
    if (write(routes, &rtmsg, sizeof(rtmsg)) < 0) {
	error("Couldn't %s default route: %m",
	       cmd=='s'? "add": "delete");
	close(routes);
	return 0;
    }

    close(routes);
    default_route_gateway = (cmd == 's')? g: 0;
    return 1;
}

#if RTM_VERSION >= 3

/*
 * sifproxyarp - Make a proxy ARP entry for the peer.
 */
static struct {
    struct rt_msghdr		hdr;
    struct sockaddr_inarp	dst;
    struct sockaddr_dl		hwa;
    char			extra[128];
} arpmsg;

static int arpmsg_valid;

int
sifproxyarp(unit, hisaddr)
    int unit;
    u_int32_t hisaddr;
{
    int routes;

    /*
     * Get the hardware address of an interface on the same subnet
     * as our local address.
     */
    memset(&arpmsg, 0, sizeof(arpmsg));
    if (!get_ether_addr(hisaddr, &arpmsg.hwa)) {
	error("Cannot determine ethernet address for proxy ARP");
	return 0;
    }

    if ((routes = socket(PF_ROUTE, SOCK_RAW, AF_INET)) < 0) {
	error("Couldn't add proxy arp entry: socket: %m");
	return 0;
    }

    arpmsg.hdr.rtm_type = RTM_ADD;
    arpmsg.hdr.rtm_flags = RTF_ANNOUNCE | RTF_HOST | RTF_STATIC;
    arpmsg.hdr.rtm_version = RTM_VERSION;
    arpmsg.hdr.rtm_seq = ++rtm_seq;
    arpmsg.hdr.rtm_addrs = RTA_DST | RTA_GATEWAY;
    arpmsg.hdr.rtm_inits = RTV_EXPIRE;
    arpmsg.dst.sin_len = sizeof(struct sockaddr_inarp);
    arpmsg.dst.sin_family = AF_INET;
    arpmsg.dst.sin_addr.s_addr = hisaddr;
    arpmsg.dst.sin_other = SIN_PROXY;

    arpmsg.hdr.rtm_msglen = (char *) &arpmsg.hwa - (char *) &arpmsg
	+ arpmsg.hwa.sdl_len;
    if (write(routes, &arpmsg, arpmsg.hdr.rtm_msglen) < 0) {
	error("Couldn't add proxy arp entry: %m");
	close(routes);
	return 0;
    }

    close(routes);
    arpmsg_valid = 1;
    proxy_arp_addr = hisaddr;
    return 1;
}

/*
 * cifproxyarp - Delete the proxy ARP entry for the peer.
 */
int
cifproxyarp(unit, hisaddr)
    int unit;
    u_int32_t hisaddr;
{
    int routes;

    if (!arpmsg_valid)
	return 0;
    arpmsg_valid = 0;

    arpmsg.hdr.rtm_type = RTM_DELETE;
    arpmsg.hdr.rtm_seq = ++rtm_seq;

    if ((routes = socket(PF_ROUTE, SOCK_RAW, AF_INET)) < 0) {
	error("Couldn't delete proxy arp entry: socket: %m");
	return 0;
    }

    if (write(routes, &arpmsg, arpmsg.hdr.rtm_msglen) < 0) {
	error("Couldn't delete proxy arp entry: %m");
	close(routes);
	return 0;
    }

    close(routes);
    proxy_arp_addr = 0;
    return 1;
}

#else	/* RTM_VERSION */

/*
 * sifproxyarp - Make a proxy ARP entry for the peer.
 */
int
sifproxyarp(unit, hisaddr)
    int unit;
    u_int32_t hisaddr;
{
    struct arpreq arpreq;
    struct {
	struct sockaddr_dl	sdl;
	char			space[128];
    } dls;

    BZERO(&arpreq, sizeof(arpreq));

    /*
     * Get the hardware address of an interface on the same subnet
     * as our local address.
     */
    if (!get_ether_addr(hisaddr, &dls.sdl)) {
	error("Cannot determine ethernet address for proxy ARP");
	return 0;
    }

    arpreq.arp_ha.sa_len = sizeof(struct sockaddr);
    arpreq.arp_ha.sa_family = AF_UNSPEC;
    BCOPY(LLADDR(&dls.sdl), arpreq.arp_ha.sa_data, dls.sdl.sdl_alen);
    SET_SA_FAMILY(arpreq.arp_pa, AF_INET);
    ((struct sockaddr_in *) &arpreq.arp_pa)->sin_addr.s_addr = hisaddr;
    arpreq.arp_flags = ATF_PERM | ATF_PUBL;
    if (ioctl(sockfd, SIOCSARP, (caddr_t)&arpreq) < 0) {
	error("Couldn't add proxy arp entry: %m");
	return 0;
    }

    proxy_arp_addr = hisaddr;
    return 1;
}

/*
 * cifproxyarp - Delete the proxy ARP entry for the peer.
 */
int
cifproxyarp(unit, hisaddr)
    int unit;
    u_int32_t hisaddr;
{
    struct arpreq arpreq;

    BZERO(&arpreq, sizeof(arpreq));
    SET_SA_FAMILY(arpreq.arp_pa, AF_INET);
    ((struct sockaddr_in *) &arpreq.arp_pa)->sin_addr.s_addr = hisaddr;
    if (ioctl(sockfd, SIOCDARP, (caddr_t)&arpreq) < 0) {
	warn("Couldn't delete proxy arp entry: %m");
	return 0;
    }
    proxy_arp_addr = 0;
    return 1;
}
#endif	/* RTM_VERSION */


/*
 * get_ether_addr - get the hardware address of an interface on the
 * the same subnet as ipaddr.
 */
#define MAX_IFS		32

static int
get_ether_addr(ipaddr, hwaddr)
    u_int32_t ipaddr;
    struct sockaddr_dl *hwaddr;
{
    struct ifreq *ifr, *ifend, *ifp;
    u_int32_t ina, mask;
    struct sockaddr_dl *dla;
    struct ifreq ifreq;
    struct ifconf ifc;
    struct ifreq ifs[MAX_IFS];

    ifc.ifc_len = sizeof(ifs);
    ifc.ifc_req = ifs;
    if (ioctl(sockfd, SIOCGIFCONF, &ifc) < 0) {
	error("ioctl(SIOCGIFCONF): %m");
	return 0;
    }

    /*
     * Scan through looking for an interface with an Internet
     * address on the same subnet as `ipaddr'.
     */
    ifend = (struct ifreq *) (ifc.ifc_buf + ifc.ifc_len);
    for (ifr = ifc.ifc_req; ifr < ifend; ifr = (struct ifreq *)
	 	((char *)&ifr->ifr_addr + ifr->ifr_addr.sa_len)) {
	if (ifr->ifr_addr.sa_family == AF_INET) {
	    ina = ((struct sockaddr_in *) &ifr->ifr_addr)->sin_addr.s_addr;
	    strlcpy(ifreq.ifr_name, ifr->ifr_name, sizeof(ifreq.ifr_name));
	    /*
	     * Check that the interface is up, and not point-to-point
	     * or loopback.
	     */
	    if (ioctl(sockfd, SIOCGIFFLAGS, &ifreq) < 0)
		continue;
	    if ((ifreq.ifr_flags &
		 (IFF_UP|IFF_BROADCAST|IFF_POINTOPOINT|IFF_LOOPBACK|IFF_NOARP))
		 != (IFF_UP|IFF_BROADCAST))
		continue;
	    /*
	     * Get its netmask and check that it's on the right subnet.
	     */
	    if (ioctl(sockfd, SIOCGIFNETMASK, &ifreq) < 0)
		continue;
	    mask = ((struct sockaddr_in *) &ifreq.ifr_addr)->sin_addr.s_addr;
	    if ((ipaddr & mask) != (ina & mask))
		continue;

	    break;
	}
    }

    if (ifr >= ifend)
	return 0;
    info("found interface %s for proxy arp", ifr->ifr_name);

    /*
     * Now scan through again looking for a link-level address
     * for this interface.
     */
    ifp = ifr;
    for (ifr = ifc.ifc_req; ifr < ifend; ) {
	if (strcmp(ifp->ifr_name, ifr->ifr_name) == 0
	    && ifr->ifr_addr.sa_family == AF_LINK) {
	    /*
	     * Found the link-level address - copy it out
	     */
	    dla = (struct sockaddr_dl *) &ifr->ifr_addr;
	    BCOPY(dla, hwaddr, dla->sdl_len);
	    return 1;
	}
	ifr = (struct ifreq *) ((char *)&ifr->ifr_addr + ifr->ifr_addr.sa_len);
    }

    return 0;
}

/*
 * Return user specified netmask, modified by any mask we might determine
 * for address `addr' (in network byte order).
 * Here we scan through the system's list of interfaces, looking for
 * any non-point-to-point interfaces which might appear to be on the same
 * network as `addr'.  If we find any, we OR in their netmask to the
 * user-specified netmask.
 */
u_int32_t
GetMask(addr)
    u_int32_t addr;
{
    u_int32_t mask, nmask, ina;
    struct ifreq *ifr, *ifend, ifreq;
    struct ifconf ifc;
    struct ifreq ifs[MAX_IFS];

    addr = ntohl(addr);
    if (IN_CLASSA(addr))	/* determine network mask for address class */
	nmask = IN_CLASSA_NET;
    else if (IN_CLASSB(addr))
	nmask = IN_CLASSB_NET;
    else
	nmask = IN_CLASSC_NET;
    /* class D nets are disallowed by bad_ip_adrs */
    mask = netmask | htonl(nmask);

    /*
     * Scan through the system's network interfaces.
     */
    ifc.ifc_len = sizeof(ifs);
    ifc.ifc_req = ifs;
    if (ioctl(sockfd, SIOCGIFCONF, &ifc) < 0) {
	warn("ioctl(SIOCGIFCONF): %m");
	return mask;
    }
    ifend = (struct ifreq *) (ifc.ifc_buf + ifc.ifc_len);
    for (ifr = ifc.ifc_req; ifr < ifend; ifr = (struct ifreq *)
	 	((char *)&ifr->ifr_addr + ifr->ifr_addr.sa_len)) {
	/*
	 * Check the interface's internet address.
	 */
	if (ifr->ifr_addr.sa_family != AF_INET)
	    continue;
	ina = ((struct sockaddr_in *) &ifr->ifr_addr)->sin_addr.s_addr;
	if ((ntohl(ina) & nmask) != (addr & nmask))
	    continue;
	/*
	 * Check that the interface is up, and not point-to-point or loopback.
	 */
	strlcpy(ifreq.ifr_name, ifr->ifr_name, sizeof(ifreq.ifr_name));
	if (ioctl(sockfd, SIOCGIFFLAGS, &ifreq) < 0)
	    continue;
	if ((ifreq.ifr_flags & (IFF_UP|IFF_POINTOPOINT|IFF_LOOPBACK))
	    != IFF_UP)
	    continue;
	/*
	 * Get its netmask and OR it into our mask.
	 */
	if (ioctl(sockfd, SIOCGIFNETMASK, &ifreq) < 0)
	    continue;
	mask |= ((struct sockaddr_in *)&ifreq.ifr_addr)->sin_addr.s_addr;
    }

    return mask;
}

/*
 * have_route_to - determine if the system has any route to
 * a given IP address.
 * For demand mode to work properly, we have to ignore routes
 * through our own interface.
 */
int have_route_to(u_int32_t addr)
{
    return -1;
}

/*
 * Use the hostid as part of the random number seed.
 */
int
get_host_seed()
{
    return gethostid();
}

#if 0
/*
 * lock - create a lock file for the named lock device
 */
#define	LOCK_PREFIX	"/var/spool/lock/LCK.."

static char *lock_file;		/* name of lock file created */

int
lock(dev)
    char *dev;
{
    char hdb_lock_buffer[12];
    int fd, pid, n;
    char *p;
    size_t l;

    if ((p = strrchr(dev, '/')) != NULL)
	dev = p + 1;
    l = strlen(LOCK_PREFIX) + strlen(dev) + 1;
    lock_file = malloc(l);
    if (lock_file == NULL)
	novm("lock file name");
    slprintf(lock_file, l, "%s%s", LOCK_PREFIX, dev);

    while ((fd = open(lock_file, O_EXCL | O_CREAT | O_RDWR, 0644)) < 0) {
	if (errno == EEXIST
	    && (fd = open(lock_file, O_RDONLY, 0)) >= 0) {
	    /* Read the lock file to find out who has the device locked */
	    n = read(fd, hdb_lock_buffer, 11);
	    if (n <= 0) {
		error("Can't read pid from lock file %s", lock_file);
		close(fd);
	    } else {
		hdb_lock_buffer[n] = 0;
		pid = atoi(hdb_lock_buffer);
		if (kill(pid, 0) == -1 && errno == ESRCH) {
		    /* pid no longer exists - remove the lock file */
		    if (unlink(lock_file) == 0) {
			close(fd);
			notice("Removed stale lock on %s (pid %d)",
			       dev, pid);
			continue;
		    } else
			warn("Couldn't remove stale lock on %s",
			       dev);
		} else
		    notice("Device %s is locked by pid %d",
			   dev, pid);
	    }
	    close(fd);
	} else
	    error("Can't create lock file %s: %m", lock_file);
	free(lock_file);
	lock_file = NULL;
	return -1;
    }

    slprintf(hdb_lock_buffer, sizeof(hdb_lock_buffer), "%10d\n", getpid());
    write(fd, hdb_lock_buffer, 11);

    close(fd);
    return 0;
}

/*
 * unlock - remove our lockfile
 */
void
unlock()
{
    if (lock_file) {
	unlink(lock_file);
	free(lock_file);
	lock_file = NULL;
    }
}
#endif