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/*
*
* Authors:
* Craig Metz <cmetz@inner.net>
*
* This software is Copyright 1996,1997 by the above mentioned author(s),
* All Rights Reserved.
*
* The license which is distributed with this software in the file COPYRIGHT
* applies to this software. If your distribution is missing this file, you
* may request it from <reubenhwk@gmail.com>.
*
*/
#include "config.h"
#include "defaults.h"
#include "includes.h"
#include "radvd.h"
/*
* this function gets the hardware type and address of an interface,
* determines the link layer token length and checks it against
* the defined prefixes
*/
int update_device_info(int sock, struct Interface *iface)
{
struct ifaddrs *addresses = 0;
struct ifreq ifr;
memset(&ifr, 0, sizeof(ifr));
strncpy(ifr.ifr_name, iface->props.name, IFNAMSIZ - 1);
ifr.ifr_name[IFNAMSIZ - 1] = '\0';
if (ioctl(sock, SIOCGIFMTU, &ifr) < 0) {
flog(LOG_ERR, "ioctl(SIOCGIFMTU) failed for %s: %s", iface->props.name, strerror(errno));
goto ret;
}
dlog(LOG_DEBUG, 3, "mtu for %s is %d", iface->props.name, ifr.ifr_mtu);
iface->sllao.if_maxmtu = ifr.ifr_mtu;
/* RFC 2460: 5. Packet Size Issues */
iface->props.max_ra_option_size = iface->AdvRAMTU;
iface->props.max_ra_option_size = MIN(iface->props.max_ra_option_size, MAX(iface->sllao.if_maxmtu, RFC2460_MIN_MTU));
if (getifaddrs(&addresses) != 0) {
flog(LOG_ERR, "getifaddrs failed: %s(%d)", strerror(errno), errno);
goto ret;
}
for (struct ifaddrs *ifa = addresses; ifa != NULL; ifa = ifa->ifa_next) {
if (strcmp(ifa->ifa_name, iface->props.name) != 0)
continue;
if (ifa->ifa_addr == NULL)
continue;
if (ifa->ifa_addr->sa_family != AF_LINK)
continue;
struct sockaddr_dl *dl = (struct sockaddr_dl *)ifa->ifa_addr;
if (dl->sdl_alen > sizeof(iface->props.if_addr)) {
flog(LOG_ERR, "address length %d too big for %s", dl->sdl_alen, iface->props.name);
goto ret;
}
memcpy(iface->sllao.if_hwaddr, LLADDR(dl), dl->sdl_alen);
iface->sllao.if_hwaddr_len = dl->sdl_alen << 3;
switch (dl->sdl_type) {
case IFT_ETHER:
case IFT_ISO88023:
iface->sllao.if_prefix_len = 64;
iface->props.max_ra_option_size -= 14; /* RFC 2464 */
break;
case IFT_FDDI:
iface->sllao.if_prefix_len = 64;
iface->props.max_ra_option_size -= 22; /* RFC 2109 */
break;
default:
iface->sllao.if_prefix_len = -1;
iface->sllao.if_maxmtu = -1;
/* Assume fragmentation handled at a lower layer. */
iface->props.max_ra_option_size -= 0;
break;
}
dlog(LOG_DEBUG, 3, "link layer token length for %s is %d", iface->props.name, iface->sllao.if_hwaddr_len);
dlog(LOG_DEBUG, 3, "prefix length for %s is %d", iface->props.name, iface->sllao.if_prefix_len);
if (iface->sllao.if_prefix_len != -1) {
char zero[sizeof(iface->props.if_addr)];
memset(zero, 0, dl->sdl_alen);
if (!memcmp(iface->sllao.if_hwaddr, zero, dl->sdl_alen))
flog(LOG_WARNING, "WARNING, MAC address on %s is all zero!", iface->props.name);
}
struct AdvPrefix *prefix = iface->AdvPrefixList;
while (prefix) {
if ((iface->sllao.if_prefix_len != -1) && (iface->sllao.if_prefix_len != prefix->PrefixLen)) {
flog(LOG_WARNING, "prefix length should be %d for %s", iface->sllao.if_prefix_len,
iface->props.name);
}
prefix = prefix->next;
}
freeifaddrs(addresses);
// Regardless of link-layer, every RA message will have an IPV6 header & RA header
iface->props.max_ra_option_size -= sizeof(struct ip6_hdr);
iface->props.max_ra_option_size -= sizeof(struct nd_router_advert);
return 0;
}
ret:
iface->sllao.if_maxmtu = -1;
iface->sllao.if_hwaddr_len = -1;
iface->sllao.if_prefix_len = -1;
if (addresses != 0)
freeifaddrs(addresses);
return -1;
}
int setup_allrouters_membership(int sock, struct Interface *iface) { return 0; }
int set_interface_linkmtu(const char *iface, uint32_t mtu)
{
dlog(LOG_DEBUG, 4, "setting LinkMTU (%u) for %s is not supported", mtu, iface);
return -1;
}
int set_interface_curhlim(const char *iface, uint8_t hlim)
{
dlog(LOG_DEBUG, 4, "setting CurHopLimit (%u) for %s is not supported", hlim, iface);
return -1;
}
int set_interface_reachtime(const char *iface, uint32_t rtime)
{
dlog(LOG_DEBUG, 4, "setting BaseReachableTime (%u) for %s is not supported", rtime, iface);
return -1;
}
int set_interface_retranstimer(const char *iface, uint32_t rettimer)
{
dlog(LOG_DEBUG, 4, "setting RetransTimer (%u) for %s is not supported", rettimer, iface);
return -1;
}
int check_ip6_forwarding(void)
{
dlog(LOG_DEBUG, 4, "checking ipv6 forwarding not supported");
return 0;
}
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