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#include <unistd.h>
#include <string.h>
#include <stropts.h>
#include <errno.h>
#include <sys/ioctl.h>
#include <linux/ipv6.h>
#include "tun.h"
#include "syserr.h"
/* Defined in tun.c */
int tun_sifflags(struct tun_t *this, int flags);
int tun_setaddr6(struct tun_t *this, struct in6_addr *addr, struct in6_addr *dstaddr,
size_t prefixlen)
{
struct in6_ifreq ifr;
int fd;
memset(&ifr, 0, sizeof(ifr));
#if defined(__linux__)
ifr.ifr6_prefixlen = prefixlen;
ifr.ifr6_ifindex = if_nametoindex(this->devname);
if (ifr.ifr6_ifindex == 0) {
SYS_ERR(DTUN, LOGL_ERROR, 0, "Error getting ifindex for %s\n", this->devname);
return -1;
}
#elif defined(__FreeBSD__) || defined (__APPLE__)
strncpy(ifr.ifr_name, this->devname, IFNAMSIZ);
#endif
/* Create a channel to the NET kernel */
if ((fd = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
SYS_ERR(DTUN, LOGL_ERROR, 0, "socket() failed");
return -1;
}
#if defined(__linux__)
if (addr) {
memcpy(&ifr.ifr6_addr, addr, sizeof(*addr));
if (ioctl(fd, SIOCSIFADDR, (void *) &ifr) < 0) {
if (errno != EEXIST) {
SYS_ERR(DTUN, LOGL_ERROR, 0, "ioctl(SIOCSIFADDR) failed");
} else {
SYS_ERR(DTUN, LOGL_NOTICE, 0, "ioctl(SIOCSIFADDR): Address already exists");
}
close(fd);
return -1;
}
}
#if 0
/* FIXME: looks like this is not possible/necessary for IPv6? */
if (dstaddr) {
memcpy(&this->dstaddr, dstaddr, sizeof(*dstaddr));
memcpy(&ifr.ifr6_addr, dstaddr, sizeof(*dstaddr));
if (ioctl(fd, SIOCSIFDSTADDR, (caddr_t *) &ifr) < 0) {
SYS_ERR(DTUN, LOGL_ERROR, "ioctl(SIOCSIFDSTADDR) failed");
close(fd);
return -1;
}
}
#endif
#elif defined(__FreeBSD__) || defined (__APPLE__)
if (addr)
memcpy(&ifr.ifr_ifru.ifru_addr, addr, sizeof(ifr.ifr_ifru.ifru_addr));
if (dstaddr)
memcpy(&ifr.ifr_ifru.ifru_dstaddr, dstaddr, sizeof(ifr.ifr_ifru.ifru_dstaddr));
if (ioctl(fd, SIOCSIFADDR_IN6, (struct ifreq *)&ifr) < 0) {
SYS_ERR(DTUN, LOGL_ERROR, 0, "ioctl(SIOCSIFADDR_IN6) failed");
close(fd);
return -1;
}
#endif
close(fd);
this->addrs++;
/* On linux the route to the interface is set automatically
on FreeBSD we have to do this manually */
/* TODO: How does it work on Solaris? */
tun_sifflags(this, IFF_UP | IFF_RUNNING);
#if 0 /* FIXME */
//#if defined(__FreeBSD__) || defined (__APPLE__)
tun_addroute6(this, dstaddr, addr, prefixlen);
this->routes = 1;
#endif
return 0;
}
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