/* tipc_bearer_reset_all - reset all links on all bearers
*/
void tipc_bearer_reset_all(struct net *net)
{
struct tipc_net *tn = tipc_net(net);
struct tipc_bearer *b;
int i;
for (i = 0; i < MAX_BEARERS; i++) {
b = rcu_dereference_rtnl(tn->bearer_list[i]);
if (b)
tipc_reset_bearer(net, b);
}
}
int tipc_bearer_mtu(struct net *net, u32 bearer_id)
{
int mtu = 0;
struct tipc_bearer *b;
rcu_read_lock();
b = rcu_dereference_rtnl(tipc_net(net)->bearer_list[bearer_id]);
if (b)
mtu = b->mtu;
rcu_read_unlock();
return mtu;
}
/**
* bearer_disable
*
* Note: This routine assumes caller holds RTNL lock.
*/
static void bearer_disable(struct net *net, struct tipc_bearer *b)
{
struct tipc_net *tn = tipc_net(net);
int bearer_id = b->identity;
pr_info("Disabling bearer <%s>\n", b->name);
b->media->disable_media(b);
tipc_node_delete_links(net, bearer_id);
RCU_INIT_POINTER(b->media_ptr, NULL);
if (b->link_req)
tipc_disc_delete(b->link_req);
RCU_INIT_POINTER(tn->bearer_list[bearer_id], NULL);
kfree_rcu(b, rcu);
}
/* tipc_bearer_get_name - get the bearer name from its id.
* @net: network namespace
* @name: a pointer to the buffer where the name will be stored.
* @bearer_id: the id to get the name from.
*/
int tipc_bearer_get_name(struct net *net, char *name, u32 bearer_id)
{
struct tipc_net *tn = tipc_net(net);
struct tipc_bearer *b;
if (bearer_id >= MAX_BEARERS)
return -EINVAL;
b = rtnl_dereference(tn->bearer_list[bearer_id]);
if (!b)
return -EINVAL;
strcpy(name, b->name);
return 0;
}
/* tipc_bearer_xmit_skb - sends buffer to destination over bearer
*/
void tipc_bearer_xmit_skb(struct net *net, u32 bearer_id,
struct sk_buff *skb,
struct tipc_media_addr *dest)
{
struct tipc_net *tn = tipc_net(net);
struct tipc_bearer *b;
rcu_read_lock();
b = rcu_dereference_rtnl(tn->bearer_list[bearer_id]);
if (likely(b))
b->media->send_msg(net, skb, b, dest);
else
kfree_skb(skb);
rcu_read_unlock();
}
static struct tipc_bearer *bearer_get(struct net *net, int bearer_id)
{
struct tipc_net *tn = tipc_net(net);
return rcu_dereference_rtnl(tn->bearer_list[bearer_id]);
}
/**
* tipc_enable_bearer - enable bearer with the given name
*/
static int tipc_enable_bearer(struct net *net, const char *name,
u32 disc_domain, u32 prio,
struct nlattr *attr[])
{
struct tipc_net *tn = tipc_net(net);
struct tipc_bearer_names b_names;
int with_this_prio = 1;
struct tipc_bearer *b;
struct tipc_media *m;
struct sk_buff *skb;
int bearer_id = 0;
int res = -EINVAL;
char *errstr = "";
if (!bearer_name_validate(name, &b_names)) {
errstr = "illegal name";
goto rejected;
}
if (prio > TIPC_MAX_LINK_PRI && prio != TIPC_MEDIA_LINK_PRI) {
errstr = "illegal priority";
goto rejected;
}
m = tipc_media_find(b_names.media_name);
if (!m) {
errstr = "media not registered";
goto rejected;
}
if (prio == TIPC_MEDIA_LINK_PRI)
prio = m->priority;
/* Check new bearer vs existing ones and find free bearer id if any */
while (bearer_id < MAX_BEARERS) {
b = rtnl_dereference(tn->bearer_list[bearer_id]);
if (!b)
break;
if (!strcmp(name, b->name)) {
errstr = "already enabled";
goto rejected;
}
bearer_id++;
if (b->priority != prio)
continue;
if (++with_this_prio <= 2)
continue;
pr_warn("Bearer <%s>: already 2 bearers with priority %u\n",
name, prio);
if (prio == TIPC_MIN_LINK_PRI) {
errstr = "cannot adjust to lower";
goto rejected;
}
pr_warn("Bearer <%s>: trying with adjusted priority\n", name);
prio--;
bearer_id = 0;
with_this_prio = 1;
}
if (bearer_id >= MAX_BEARERS) {
errstr = "max 3 bearers permitted";
goto rejected;
}
b = kzalloc(sizeof(*b), GFP_ATOMIC);
if (!b)
return -ENOMEM;
strcpy(b->name, name);
b->media = m;
res = m->enable_media(net, b, attr);
if (res) {
kfree(b);
errstr = "failed to enable media";
goto rejected;
}
b->identity = bearer_id;
b->tolerance = m->tolerance;
b->window = m->window;
b->domain = disc_domain;
b->net_plane = bearer_id + 'A';
b->priority = prio;
test_and_set_bit_lock(0, &b->up);
res = tipc_disc_create(net, b, &b->bcast_addr, &skb);
if (res) {
bearer_disable(net, b);
kfree(b);
errstr = "failed to create discoverer";
goto rejected;
}
rcu_assign_pointer(tn->bearer_list[bearer_id], b);
if (skb)
tipc_bearer_xmit_skb(net, bearer_id, skb, &b->bcast_addr);
if (tipc_mon_create(net, bearer_id)) {
bearer_disable(net, b);
return -ENOMEM;
}
pr_info("Enabled bearer <%s>, priority %u\n", name, prio);
return res;
rejected:
pr_warn("Enabling of bearer <%s> rejected, %s\n", name, errstr);
return res;
}
static struct tipc_bc_base *tipc_bc_base(struct net *net)
{
return tipc_net(net)->bcbase;
}
