/**
* mesh_path_start_discovery - launch a path discovery from the PREQ queue
*
* @sdata: local mesh subif
*/
void mesh_path_start_discovery(struct ieee80211_sub_if_data *sdata)
{
struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
struct mesh_preq_queue *preq_node;
struct mesh_path *mpath;
u8 ttl, target_flags = 0;
const u8 *da;
u32 lifetime;
spin_lock_bh(&ifmsh->mesh_preq_queue_lock);
if (!ifmsh->preq_queue_len ||
time_before(jiffies, ifmsh->last_preq +
min_preq_int_jiff(sdata))) {
spin_unlock_bh(&ifmsh->mesh_preq_queue_lock);
return;
}
preq_node = list_first_entry(&ifmsh->preq_queue.list,
struct mesh_preq_queue, list);
list_del(&preq_node->list);
--ifmsh->preq_queue_len;
spin_unlock_bh(&ifmsh->mesh_preq_queue_lock);
rcu_read_lock();
mpath = mesh_path_lookup(sdata, preq_node->dst);
if (!mpath)
goto enddiscovery;
spin_lock_bh(&mpath->state_lock);
if (mpath->flags & (MESH_PATH_DELETED | MESH_PATH_FIXED)) {
spin_unlock_bh(&mpath->state_lock);
goto enddiscovery;
}
mpath->flags &= ~MESH_PATH_REQ_QUEUED;
if (preq_node->flags & PREQ_Q_F_START) {
if (mpath->flags & MESH_PATH_RESOLVING) {
spin_unlock_bh(&mpath->state_lock);
goto enddiscovery;
} else {
mpath->flags &= ~MESH_PATH_RESOLVED;
mpath->flags |= MESH_PATH_RESOLVING;
mpath->discovery_retries = 0;
mpath->discovery_timeout = disc_timeout_jiff(sdata);
}
} else if (!(mpath->flags & MESH_PATH_RESOLVING) ||
mpath->flags & MESH_PATH_RESOLVED) {
mpath->flags &= ~MESH_PATH_RESOLVING;
spin_unlock_bh(&mpath->state_lock);
goto enddiscovery;
}
ifmsh->last_preq = jiffies;
if (time_after(jiffies, ifmsh->last_sn_update +
net_traversal_jiffies(sdata)) ||
time_before(jiffies, ifmsh->last_sn_update)) {
++ifmsh->sn;
sdata->u.mesh.last_sn_update = jiffies;
}
lifetime = default_lifetime(sdata);
ttl = sdata->u.mesh.mshcfg.element_ttl;
if (ttl == 0) {
sdata->u.mesh.mshstats.dropped_frames_ttl++;
spin_unlock_bh(&mpath->state_lock);
goto enddiscovery;
}
if (preq_node->flags & PREQ_Q_F_REFRESH)
target_flags |= IEEE80211_PREQ_TO_FLAG;
else
target_flags &= ~IEEE80211_PREQ_TO_FLAG;
spin_unlock_bh(&mpath->state_lock);
da = (mpath->is_root) ? mpath->rann_snd_addr : broadcast_addr;
mesh_path_sel_frame_tx(MPATH_PREQ, 0, sdata->vif.addr, ifmsh->sn,
target_flags, mpath->dst, mpath->sn, da, 0,
ttl, lifetime, 0, ifmsh->preq_id++, sdata);
mod_timer(&mpath->timer, jiffies + mpath->discovery_timeout);
enddiscovery:
rcu_read_unlock();
kfree(preq_node);
}
/**
* mesh_path_start_discovery - launch a path discovery from the PREQ queue
*
* @sdata: local mesh subif
*/
void mesh_path_start_discovery(struct ieee80211_sub_if_data *sdata)
{
struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
struct mesh_preq_queue *preq_node;
struct mesh_path *mpath;
u8 ttl, dst_flags;
u32 lifetime;
spin_lock_bh(&ifmsh->mesh_preq_queue_lock);
if (!ifmsh->preq_queue_len ||
time_before(jiffies, ifmsh->last_preq +
min_preq_int_jiff(sdata))) {
spin_unlock_bh(&ifmsh->mesh_preq_queue_lock);
return;
}
preq_node = list_first_entry(&ifmsh->preq_queue.list,
struct mesh_preq_queue, list);
list_del(&preq_node->list);
--ifmsh->preq_queue_len;
spin_unlock_bh(&ifmsh->mesh_preq_queue_lock);
rcu_read_lock();
mpath = mesh_path_lookup(preq_node->dst, sdata);
if (!mpath)
goto enddiscovery;
spin_lock_bh(&mpath->state_lock);
if (preq_node->flags & PREQ_Q_F_START) {
if (mpath->flags & MESH_PATH_RESOLVING) {
spin_unlock_bh(&mpath->state_lock);
goto enddiscovery;
} else {
mpath->flags &= ~MESH_PATH_RESOLVED;
mpath->flags |= MESH_PATH_RESOLVING;
mpath->discovery_retries = 0;
mpath->discovery_timeout = disc_timeout_jiff(sdata);
}
} else if (!(mpath->flags & MESH_PATH_RESOLVING) ||
mpath->flags & MESH_PATH_RESOLVED) {
mpath->flags &= ~MESH_PATH_RESOLVING;
spin_unlock_bh(&mpath->state_lock);
goto enddiscovery;
}
ifmsh->last_preq = jiffies;
if (time_after(jiffies, ifmsh->last_dsn_update +
net_traversal_jiffies(sdata)) ||
time_before(jiffies, ifmsh->last_dsn_update)) {
++ifmsh->dsn;
sdata->u.mesh.last_dsn_update = jiffies;
}
lifetime = default_lifetime(sdata);
ttl = sdata->u.mesh.mshcfg.dot11MeshTTL;
if (ttl == 0) {
sdata->u.mesh.mshstats.dropped_frames_ttl++;
spin_unlock_bh(&mpath->state_lock);
goto enddiscovery;
}
if (preq_node->flags & PREQ_Q_F_REFRESH)
dst_flags = MP_F_DO;
else
dst_flags = MP_F_RF;
spin_unlock_bh(&mpath->state_lock);
mesh_path_sel_frame_tx(MPATH_PREQ, 0, sdata->dev->dev_addr,
cpu_to_le32(ifmsh->dsn), dst_flags, mpath->dst,
cpu_to_le32(mpath->dsn), sdata->dev->broadcast, 0,
ttl, cpu_to_le32(lifetime), 0,
cpu_to_le32(ifmsh->preq_id++), sdata);
mod_timer(&mpath->timer, jiffies + mpath->discovery_timeout);
enddiscovery:
rcu_read_unlock();
kfree(preq_node);
}
int
csm_update_service(csm_service_list *services, csm_service *s, csm_ctx *ctx, int validate)
{
if (validate)
CHECK(csm_validate_fields(ctx, s), "Service doesn't validate");
// assert(s->lifetime);
long lifetime = s->lifetime;
// check if service is attached to service_list
CHECK(co_list_contains(services->services, (co_obj_t*)container_of(s, co_service_t, service)),
"Cannot update service not in service list");
// detach s->fields from s and attach to services->service_fields
if (!co_list_contains(services->service_fields, s->fields)) {
co_obj_t *fields = s->fields;
hattach(fields, NULL);
CHECK(co_list_append(services->service_fields, fields),
"Failed to add service fields to service list");
}
/* Create or verify signature */
if (s->signature)
CHECK(csm_verify_signature(s),"Invalid signature");
else
CHECK(csm_create_signature(s),"Failed to create signature");
/* Set expiration timer on the service */
#ifdef USE_UCI
long def_lifetime = default_lifetime();
if (lifetime == 0 || (def_lifetime < lifetime && def_lifetime > 0))
lifetime = def_lifetime;
#endif
if (lifetime > 0) {
struct timeval tv;
avahi_elapse_time(&tv, 1000*lifetime, 0);
time_t current_time = time(NULL);
// create expiration event for service
s->timeout = avahi_simple_poll_get(simple_poll)->timeout_new(avahi_simple_poll_get(simple_poll),
&tv,
_csm_expire_service,
s);
/* Convert lifetime period into timestamp */
if (current_time != ((time_t)-1)) {
struct tm *timestr = localtime(¤t_time);
timestr->tm_sec += lifetime;
current_time = mktime(timestr);
char *c_time_string = ctime(¤t_time);
if (c_time_string) {
c_time_string[strlen(c_time_string)-1] = '\0'; /* ctime adds \n to end of time string; remove it */
s->expiration = h_strdup(c_time_string);
CHECK_MEM(s->expiration);
service_attach(s->expiration, s);
}
}
}
// finalize service by running update handlers
csm_services_commit(services);
return 1;
error:
return 0;
}
