/**
* demands an ipip tunnel to a certain target. If no tunnel exists it will be created
* @param target ip address of the target
* @param transportV4 true if IPv4 traffic is used, false for IPv6 traffic
* @return NULL if an error happened, pointer to olsr_iptunnel_entry otherwise
*/
struct olsr_iptunnel_entry *olsr_os_add_ipip_tunnel(union olsr_ip_addr *target, bool transportV4 __attribute__ ((unused))) {
struct olsr_iptunnel_entry *t;
assert(olsr_cnf->ip_version == AF_INET6 || transportV4);
t = (struct olsr_iptunnel_entry *)avl_find(&tunnel_tree, target);
if (t == NULL) {
char name[IFNAMSIZ];
int if_idx;
struct ipaddr_str buf;
memset(name, 0, sizeof(name));
generate_iptunnel_name(target, name);
if (olsr_cnf->ip_version == AF_INET) {
if_idx = os_ip4_tunnel(name, &target->v4.s_addr);
}
else {
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,24)
if_idx = os_ip6_tunnel(name, &target->v6);
#else
if_idx = 0;
#endif
}
if (if_idx == 0) {
// cannot create tunnel
olsr_syslog(OLSR_LOG_ERR, "Cannot create tunnel %s\n", name);
return NULL;
}
if (olsr_if_set_state(name, true)) {
if (olsr_cnf->ip_version == AF_INET) {
os_ip4_tunnel(name, NULL);
}
else {
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,24)
os_ip6_tunnel(name, NULL);
#endif
}
return NULL;
}
/* set originator IP for tunnel */
olsr_os_ifip(if_idx, &olsr_cnf->main_addr, true);
t = olsr_cookie_malloc(tunnel_cookie);
memcpy(&t->target, target, sizeof(*target));
t->node.key = &t->target;
strncpy(t->if_name, name, IFNAMSIZ);
t->if_index = if_idx;
avl_insert(&tunnel_tree, &t->node, AVL_DUP_NO);
}
t->usage++;
return t;
}
int olsr_os_init_iptunnel(const char * dev) {
tunnel_cookie = olsr_alloc_cookie("iptunnel", OLSR_COOKIE_TYPE_MEMORY);
olsr_cookie_set_memory_size(tunnel_cookie, sizeof(struct olsr_iptunnel_entry));
avl_init(&tunnel_tree, avl_comp_default);
store_iptunnel_state = olsr_if_isup(dev);
if (store_iptunnel_state) {
return 0;
}
if (olsr_if_set_state(dev, true)) {
return -1;
}
return olsr_os_ifip(if_nametoindex(dev), &olsr_cnf->main_addr, true);
}