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/* Linux multicast routing support
* Common logic shared by IPv4 [ipmr] and IPv6 [ip6mr] implementation
*/
#include <linux/mroute_base.h>
/* Sets everything common except 'dev', since that is done under locking */
void vif_device_init(struct vif_device *v,
struct net_device *dev,
unsigned long rate_limit,
unsigned char threshold,
unsigned short flags,
unsigned short get_iflink_mask)
{
v->dev = NULL;
v->bytes_in = 0;
v->bytes_out = 0;
v->pkt_in = 0;
v->pkt_out = 0;
v->rate_limit = rate_limit;
v->flags = flags;
v->threshold = threshold;
if (v->flags & get_iflink_mask)
v->link = dev_get_iflink(dev);
else
v->link = dev->ifindex;
}
EXPORT_SYMBOL(vif_device_init);
struct mr_table *
mr_table_alloc(struct net *net, u32 id,
struct mr_table_ops *ops,
void (*expire_func)(struct timer_list *t),
void (*table_set)(struct mr_table *mrt,
struct net *net))
{
struct mr_table *mrt;
mrt = kzalloc(sizeof(*mrt), GFP_KERNEL);
if (!mrt)
return NULL;
mrt->id = id;
write_pnet(&mrt->net, net);
mrt->ops = *ops;
rhltable_init(&mrt->mfc_hash, mrt->ops.rht_params);
INIT_LIST_HEAD(&mrt->mfc_cache_list);
INIT_LIST_HEAD(&mrt->mfc_unres_queue);
timer_setup(&mrt->ipmr_expire_timer, expire_func, 0);
mrt->mroute_reg_vif_num = -1;
table_set(mrt, net);
return mrt;
}
EXPORT_SYMBOL(mr_table_alloc);
void *mr_mfc_find_parent(struct mr_table *mrt, void *hasharg, int parent)
{
struct rhlist_head *tmp, *list;
struct mr_mfc *c;
list = rhltable_lookup(&mrt->mfc_hash, hasharg, *mrt->ops.rht_params);
rhl_for_each_entry_rcu(c, tmp, list, mnode)
if (parent == -1 || parent == c->mfc_parent)
return c;
return NULL;
}
EXPORT_SYMBOL(mr_mfc_find_parent);
void *mr_mfc_find_any_parent(struct mr_table *mrt, int vifi)
{
struct rhlist_head *tmp, *list;
struct mr_mfc *c;
list = rhltable_lookup(&mrt->mfc_hash, mrt->ops.cmparg_any,
*mrt->ops.rht_params);
rhl_for_each_entry_rcu(c, tmp, list, mnode)
if (c->mfc_un.res.ttls[vifi] < 255)
return c;
return NULL;
}
EXPORT_SYMBOL(mr_mfc_find_any_parent);
void *mr_mfc_find_any(struct mr_table *mrt, int vifi, void *hasharg)
{
struct rhlist_head *tmp, *list;
struct mr_mfc *c, *proxy;
list = rhltable_lookup(&mrt->mfc_hash, hasharg, *mrt->ops.rht_params);
rhl_for_each_entry_rcu(c, tmp, list, mnode) {
if (c->mfc_un.res.ttls[vifi] < 255)
return c;
/* It's ok if the vifi is part of the static tree */
proxy = mr_mfc_find_any_parent(mrt, c->mfc_parent);
if (proxy && proxy->mfc_un.res.ttls[vifi] < 255)
return c;
}
return mr_mfc_find_any_parent(mrt, vifi);
}
EXPORT_SYMBOL(mr_mfc_find_any);
#ifdef CONFIG_PROC_FS
void *mr_mfc_seq_idx(struct net *net,
struct mr_mfc_iter *it, loff_t pos)
{
struct mr_table *mrt = it->mrt;
struct mr_mfc *mfc;
rcu_read_lock();
it->cache = &mrt->mfc_cache_list;
list_for_each_entry_rcu(mfc, &mrt->mfc_cache_list, list)
if (pos-- == 0)
return mfc;
rcu_read_unlock();
spin_lock_bh(it->lock);
it->cache = &mrt->mfc_unres_queue;
list_for_each_entry(mfc, it->cache, list)
if (pos-- == 0)
return mfc;
spin_unlock_bh(it->lock);
it->cache = NULL;
return NULL;
}
EXPORT_SYMBOL(mr_mfc_seq_idx);
void *mr_mfc_seq_next(struct seq_file *seq, void *v,
loff_t *pos)
{
struct mr_mfc_iter *it = seq->private;
struct net *net = seq_file_net(seq);
struct mr_table *mrt = it->mrt;
struct mr_mfc *c = v;
++*pos;
if (v == SEQ_START_TOKEN)
return mr_mfc_seq_idx(net, seq->private, 0);
if (c->list.next != it->cache)
return list_entry(c->list.next, struct mr_mfc, list);
if (it->cache == &mrt->mfc_unres_queue)
goto end_of_list;
/* exhausted cache_array, show unresolved */
rcu_read_unlock();
it->cache = &mrt->mfc_unres_queue;
spin_lock_bh(it->lock);
if (!list_empty(it->cache))
return list_first_entry(it->cache, struct mr_mfc, list);
end_of_list:
spin_unlock_bh(it->lock);
it->cache = NULL;
return NULL;
}
EXPORT_SYMBOL(mr_mfc_seq_next);
#endif
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