/**
* tipc_l2_device_event - handle device events from network device
* @nb: the context of the notification
* @evt: the type of event
* @ptr: the net device that the event was on
*
* This function is called by the Ethernet driver in case of link
* change event.
*/
static int tipc_l2_device_event(struct notifier_block *nb, unsigned long evt,
void *ptr)
{
struct tipc_bearer *b_ptr;
struct net_device *dev = netdev_notifier_info_to_dev(ptr);
if (!net_eq(dev_net(dev), &init_net))
return NOTIFY_DONE;
b_ptr = rtnl_dereference(dev->tipc_ptr);
if (!b_ptr)
return NOTIFY_DONE;
b_ptr->mtu = dev->mtu;
switch (evt) {
case NETDEV_CHANGE:
if (netif_carrier_ok(dev))
break;
case NETDEV_DOWN:
case NETDEV_CHANGEMTU:
tipc_reset_bearer(b_ptr);
break;
case NETDEV_CHANGEADDR:
b_ptr->media->raw2addr(b_ptr, &b_ptr->addr,
(char *)dev->dev_addr);
tipc_reset_bearer(b_ptr);
break;
case NETDEV_UNREGISTER:
case NETDEV_CHANGENAME:
bearer_disable(b_ptr, false);
break;
}
return NOTIFY_OK;
}
int tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info)
{
int err;
char *name;
struct tipc_bearer *bearer;
struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
struct net *net = sock_net(skb->sk);
if (!info->attrs[TIPC_NLA_BEARER])
return -EINVAL;
err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
info->attrs[TIPC_NLA_BEARER],
tipc_nl_bearer_policy);
if (err)
return err;
if (!attrs[TIPC_NLA_BEARER_NAME])
return -EINVAL;
name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
rtnl_lock();
bearer = tipc_bearer_find(net, name);
if (!bearer) {
rtnl_unlock();
return -EINVAL;
}
bearer_disable(net, bearer, false);
rtnl_unlock();
return 0;
}
void tipc_bearer_stop(void)
{
struct tipc_bearer *b_ptr;
u32 i;
for (i = 0; i < MAX_BEARERS; i++) {
b_ptr = bearer_list[i];
if (b_ptr) {
bearer_disable(b_ptr, true);
bearer_list[i] = NULL;
}
}
}
void tipc_bearer_stop(struct net *net)
{
struct tipc_net *tn = net_generic(net, tipc_net_id);
struct tipc_bearer *b_ptr;
u32 i;
for (i = 0; i < MAX_BEARERS; i++) {
b_ptr = rtnl_dereference(tn->bearer_list[i]);
if (b_ptr) {
bearer_disable(net, b_ptr, true);
tn->bearer_list[i] = NULL;
}
}
}
int tipc_disable_bearer(const char *name)
{
struct tipc_bearer *b_ptr;
int res;
b_ptr = tipc_bearer_find(name);
if (b_ptr == NULL) {
pr_warn("Attempt to disable unknown bearer <%s>\n", name);
res = -EINVAL;
} else {
bearer_disable(b_ptr, false);
res = 0;
}
return res;
}
/**
* tipc_enable_bearer - enable bearer with the given name
*/
int tipc_enable_bearer(const char *name, u32 disc_domain, u32 priority)
{
struct tipc_bearer *b_ptr;
struct tipc_media *m_ptr;
struct tipc_bearer_names b_names;
char addr_string[16];
u32 bearer_id;
u32 with_this_prio;
u32 i;
int res = -EINVAL;
if (!tipc_own_addr) {
pr_warn("Bearer <%s> rejected, not supported in standalone mode\n",
name);
return -ENOPROTOOPT;
}
if (!bearer_name_validate(name, &b_names)) {
pr_warn("Bearer <%s> rejected, illegal name\n", name);
return -EINVAL;
}
if (tipc_addr_domain_valid(disc_domain) &&
(disc_domain != tipc_own_addr)) {
if (tipc_in_scope(disc_domain, tipc_own_addr)) {
disc_domain = tipc_own_addr & TIPC_CLUSTER_MASK;
res = 0; /* accept any node in own cluster */
} else if (in_own_cluster_exact(disc_domain))
res = 0; /* accept specified node in own cluster */
}
if (res) {
pr_warn("Bearer <%s> rejected, illegal discovery domain\n",
name);
return -EINVAL;
}
if ((priority > TIPC_MAX_LINK_PRI) &&
(priority != TIPC_MEDIA_LINK_PRI)) {
pr_warn("Bearer <%s> rejected, illegal priority\n", name);
return -EINVAL;
}
write_lock_bh(&tipc_net_lock);
m_ptr = tipc_media_find(b_names.media_name);
if (!m_ptr) {
pr_warn("Bearer <%s> rejected, media <%s> not registered\n",
name, b_names.media_name);
goto exit;
}
if (priority == TIPC_MEDIA_LINK_PRI)
priority = m_ptr->priority;
restart:
bearer_id = MAX_BEARERS;
with_this_prio = 1;
for (i = MAX_BEARERS; i-- != 0; ) {
b_ptr = bearer_list[i];
if (!b_ptr) {
bearer_id = i;
continue;
}
if (!strcmp(name, b_ptr->name)) {
pr_warn("Bearer <%s> rejected, already enabled\n",
name);
goto exit;
}
if ((b_ptr->priority == priority) &&
(++with_this_prio > 2)) {
if (priority-- == 0) {
pr_warn("Bearer <%s> rejected, duplicate priority\n",
name);
goto exit;
}
pr_warn("Bearer <%s> priority adjustment required %u->%u\n",
name, priority + 1, priority);
goto restart;
}
}
if (bearer_id >= MAX_BEARERS) {
pr_warn("Bearer <%s> rejected, bearer limit reached (%u)\n",
name, MAX_BEARERS);
goto exit;
}
b_ptr = kzalloc(sizeof(*b_ptr), GFP_ATOMIC);
if (!b_ptr) {
res = -ENOMEM;
goto exit;
}
strcpy(b_ptr->name, name);
b_ptr->media = m_ptr;
res = m_ptr->enable_media(b_ptr);
if (res) {
pr_warn("Bearer <%s> rejected, enable failure (%d)\n",
name, -res);
goto exit;
}
b_ptr->identity = bearer_id;
b_ptr->tolerance = m_ptr->tolerance;
b_ptr->window = m_ptr->window;
b_ptr->domain = disc_domain;
b_ptr->net_plane = bearer_id + 'A';
b_ptr->priority = priority;
res = tipc_disc_create(b_ptr, &b_ptr->bcast_addr);
if (res) {
bearer_disable(b_ptr, false);
pr_warn("Bearer <%s> rejected, discovery object creation failed\n",
name);
goto exit;
}
bearer_list[bearer_id] = b_ptr;
pr_info("Enabled bearer <%s>, discovery domain %s, priority %u\n",
name,
tipc_addr_string_fill(addr_string, disc_domain), priority);
exit:
write_unlock_bh(&tipc_net_lock);
return res;
}
/**
* 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;
}
/**
* tipc_enable_bearer - enable bearer with the given name
*/
static int tipc_enable_bearer(struct net *net, const char *name,
u32 disc_domain, u32 priority,
struct nlattr *attr[])
{
struct tipc_net *tn = net_generic(net, tipc_net_id);
struct tipc_bearer *b;
struct tipc_media *m;
struct tipc_bearer_names b_names;
struct sk_buff *skb;
char addr_string[16];
u32 bearer_id;
u32 with_this_prio;
u32 i;
int res = -EINVAL;
if (!tn->own_addr) {
pr_warn("Bearer <%s> rejected, not supported in standalone mode\n",
name);
return -ENOPROTOOPT;
}
if (!bearer_name_validate(name, &b_names)) {
pr_warn("Bearer <%s> rejected, illegal name\n", name);
return -EINVAL;
}
if (tipc_addr_domain_valid(disc_domain) &&
(disc_domain != tn->own_addr)) {
if (tipc_in_scope(disc_domain, tn->own_addr)) {
disc_domain = tn->own_addr & TIPC_CLUSTER_MASK;
res = 0; /* accept any node in own cluster */
} else if (in_own_cluster_exact(net, disc_domain))
res = 0; /* accept specified node in own cluster */
}
if (res) {
pr_warn("Bearer <%s> rejected, illegal discovery domain\n",
name);
return -EINVAL;
}
if ((priority > TIPC_MAX_LINK_PRI) &&
(priority != TIPC_MEDIA_LINK_PRI)) {
pr_warn("Bearer <%s> rejected, illegal priority\n", name);
return -EINVAL;
}
m = tipc_media_find(b_names.media_name);
if (!m) {
pr_warn("Bearer <%s> rejected, media <%s> not registered\n",
name, b_names.media_name);
return -EINVAL;
}
if (priority == TIPC_MEDIA_LINK_PRI)
priority = m->priority;
restart:
bearer_id = MAX_BEARERS;
with_this_prio = 1;
for (i = MAX_BEARERS; i-- != 0; ) {
b = rtnl_dereference(tn->bearer_list[i]);
if (!b) {
bearer_id = i;
continue;
}
if (!strcmp(name, b->name)) {
pr_warn("Bearer <%s> rejected, already enabled\n",
name);
return -EINVAL;
}
if ((b->priority == priority) &&
(++with_this_prio > 2)) {
if (priority-- == 0) {
pr_warn("Bearer <%s> rejected, duplicate priority\n",
name);
return -EINVAL;
}
pr_warn("Bearer <%s> priority adjustment required %u->%u\n",
name, priority + 1, priority);
goto restart;
}
}
if (bearer_id >= MAX_BEARERS) {
pr_warn("Bearer <%s> rejected, bearer limit reached (%u)\n",
name, MAX_BEARERS);
return -EINVAL;
}
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) {
pr_warn("Bearer <%s> rejected, enable failure (%d)\n",
name, -res);
return -EINVAL;
}
b->identity = bearer_id;
b->tolerance = m->tolerance;
b->window = m->window;
b->domain = disc_domain;
b->net_plane = bearer_id + 'A';
b->priority = priority;
res = tipc_disc_create(net, b, &b->bcast_addr, &skb);
if (res) {
bearer_disable(net, b);
pr_warn("Bearer <%s> rejected, discovery object creation failed\n",
name);
return -EINVAL;
}
rcu_assign_pointer(tn->bearer_list[bearer_id], b);
if (skb)
tipc_bearer_xmit_skb(net, bearer_id, skb, &b->bcast_addr);
pr_info("Enabled bearer <%s>, discovery domain %s, priority %u\n",
name,
tipc_addr_string_fill(addr_string, disc_domain), priority);
return res;
}
