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#ifndef __LINUX_MROUTE_BASE_H
#define __LINUX_MROUTE_BASE_H
#include <linux/netdevice.h>
#include <linux/rhashtable-types.h>
#include <linux/spinlock.h>
#include <net/net_namespace.h>
#include <net/sock.h>
#include <net/fib_notifier.h>
#include <net/ip_fib.h>
/**
* struct vif_device - interface representor for multicast routing
* @dev: network device being used
* @dev_tracker: refcount tracker for @dev reference
* @bytes_in: statistic; bytes ingressing
* @bytes_out: statistic; bytes egresing
* @pkt_in: statistic; packets ingressing
* @pkt_out: statistic; packets egressing
* @rate_limit: Traffic shaping (NI)
* @threshold: TTL threshold
* @flags: Control flags
* @link: Physical interface index
* @dev_parent_id: device parent id
* @local: Local address
* @remote: Remote address for tunnels
*/
struct vif_device {
struct net_device __rcu *dev;
netdevice_tracker dev_tracker;
unsigned long bytes_in, bytes_out;
unsigned long pkt_in, pkt_out;
unsigned long rate_limit;
unsigned char threshold;
unsigned short flags;
int link;
/* Currently only used by ipmr */
struct netdev_phys_item_id dev_parent_id;
__be32 local, remote;
};
struct vif_entry_notifier_info {
struct fib_notifier_info info;
struct net_device *dev;
unsigned short vif_index;
unsigned short vif_flags;
u32 tb_id;
};
static inline int mr_call_vif_notifier(struct notifier_block *nb,
unsigned short family,
enum fib_event_type event_type,
struct vif_device *vif,
struct net_device *vif_dev,
unsigned short vif_index, u32 tb_id,
struct netlink_ext_ack *extack)
{
struct vif_entry_notifier_info info = {
.info = {
.family = family,
.extack = extack,
},
.dev = vif_dev,
.vif_index = vif_index,
.vif_flags = vif->flags,
.tb_id = tb_id,
};
return call_fib_notifier(nb, event_type, &info.info);
}
static inline int mr_call_vif_notifiers(struct net *net,
unsigned short family,
enum fib_event_type event_type,
struct vif_device *vif,
struct net_device *vif_dev,
unsigned short vif_index, u32 tb_id,
unsigned int *ipmr_seq)
{
struct vif_entry_notifier_info info = {
.info = {
.family = family,
},
.dev = vif_dev,
.vif_index = vif_index,
.vif_flags = vif->flags,
.tb_id = tb_id,
};
ASSERT_RTNL();
(*ipmr_seq)++;
return call_fib_notifiers(net, event_type, &info.info);
}
#ifndef MAXVIFS
/* This one is nasty; value is defined in uapi using different symbols for
* mroute and morute6 but both map into same 32.
*/
#define MAXVIFS 32
#endif
/* Note: This helper is deprecated. */
#define VIF_EXISTS(_mrt, _idx) (!!rcu_access_pointer((_mrt)->vif_table[_idx].dev))
/* mfc_flags:
* MFC_STATIC - the entry was added statically (not by a routing daemon)
* MFC_OFFLOAD - the entry was offloaded to the hardware
*/
enum {
MFC_STATIC = BIT(0),
MFC_OFFLOAD = BIT(1),
};
/**
* struct mr_mfc - common multicast routing entries
* @mnode: rhashtable list
* @mfc_parent: source interface (iif)
* @mfc_flags: entry flags
* @expires: unresolved entry expire time
* @unresolved: unresolved cached skbs
* @last_assert: time of last assert
* @minvif: minimum VIF id
* @maxvif: maximum VIF id
* @bytes: bytes that have passed for this entry
* @pkt: packets that have passed for this entry
* @wrong_if: number of wrong source interface hits
* @lastuse: time of last use of the group (traffic or update)
* @ttls: OIF TTL threshold array
* @refcount: reference count for this entry
* @list: global entry list
* @rcu: used for entry destruction
* @free: Operation used for freeing an entry under RCU
*/
struct mr_mfc {
struct rhlist_head mnode;
unsigned short mfc_parent;
int mfc_flags;
union {
struct {
unsigned long expires;
struct sk_buff_head unresolved;
} unres;
struct {
unsigned long last_assert;
int minvif;
int maxvif;
unsigned long bytes;
unsigned long pkt;
unsigned long wrong_if;
unsigned long lastuse;
unsigned char ttls[MAXVIFS];
refcount_t refcount;
} res;
} mfc_un;
struct list_head list;
struct rcu_head rcu;
void (*free)(struct rcu_head *head);
};
static inline void mr_cache_put(struct mr_mfc *c)
{
if (refcount_dec_and_test(&c->mfc_un.res.refcount))
call_rcu(&c->rcu, c->free);
}
static inline void mr_cache_hold(struct mr_mfc *c)
{
refcount_inc(&c->mfc_un.res.refcount);
}
struct mfc_entry_notifier_info {
struct fib_notifier_info info;
struct mr_mfc *mfc;
u32 tb_id;
};
static inline int mr_call_mfc_notifier(struct notifier_block *nb,
unsigned short family,
enum fib_event_type event_type,
struct mr_mfc *mfc, u32 tb_id,
struct netlink_ext_ack *extack)
{
struct mfc_entry_notifier_info info = {
.info = {
.family = family,
.extack = extack,
},
.mfc = mfc,
.tb_id = tb_id
};
return call_fib_notifier(nb, event_type, &info.info);
}
static inline int mr_call_mfc_notifiers(struct net *net,
unsigned short family,
enum fib_event_type event_type,
struct mr_mfc *mfc, u32 tb_id,
unsigned int *ipmr_seq)
{
struct mfc_entry_notifier_info info = {
.info = {
.family = family,
},
.mfc = mfc,
.tb_id = tb_id
};
ASSERT_RTNL();
(*ipmr_seq)++;
return call_fib_notifiers(net, event_type, &info.info);
}
struct mr_table;
/**
* struct mr_table_ops - callbacks and info for protocol-specific ops
* @rht_params: parameters for accessing the MFC hash
* @cmparg_any: a hash key to be used for matching on (*,*) routes
*/
struct mr_table_ops {
const struct rhashtable_params *rht_params;
void *cmparg_any;
};
/**
* struct mr_table - a multicast routing table
* @list: entry within a list of multicast routing tables
* @net: net where this table belongs
* @ops: protocol specific operations
* @id: identifier of the table
* @mroute_sk: socket associated with the table
* @ipmr_expire_timer: timer for handling unresolved routes
* @mfc_unres_queue: list of unresolved MFC entries
* @vif_table: array containing all possible vifs
* @mfc_hash: Hash table of all resolved routes for easy lookup
* @mfc_cache_list: list of resovled routes for possible traversal
* @maxvif: Identifier of highest value vif currently in use
* @cache_resolve_queue_len: current size of unresolved queue
* @mroute_do_assert: Whether to inform userspace on wrong ingress
* @mroute_do_pim: Whether to receive IGMP PIMv1
* @mroute_reg_vif_num: PIM-device vif index
*/
struct mr_table {
struct list_head list;
possible_net_t net;
struct mr_table_ops ops;
u32 id;
struct sock __rcu *mroute_sk;
struct timer_list ipmr_expire_timer;
struct list_head mfc_unres_queue;
struct vif_device vif_table[MAXVIFS];
struct rhltable mfc_hash;
struct list_head mfc_cache_list;
int maxvif;
atomic_t cache_resolve_queue_len;
bool mroute_do_assert;
bool mroute_do_pim;
bool mroute_do_wrvifwhole;
int mroute_reg_vif_num;
};
#ifdef CONFIG_IP_MROUTE_COMMON
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);
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));
/* These actually return 'struct mr_mfc *', but to avoid need for explicit
* castings they simply return void.
*/
void *mr_mfc_find_parent(struct mr_table *mrt,
void *hasharg, int parent);
void *mr_mfc_find_any_parent(struct mr_table *mrt, int vifi);
void *mr_mfc_find_any(struct mr_table *mrt, int vifi, void *hasharg);
int mr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb,
struct mr_mfc *c, struct rtmsg *rtm);
int mr_table_dump(struct mr_table *mrt, struct sk_buff *skb,
struct netlink_callback *cb,
int (*fill)(struct mr_table *mrt, struct sk_buff *skb,
u32 portid, u32 seq, struct mr_mfc *c,
int cmd, int flags),
spinlock_t *lock, struct fib_dump_filter *filter);
int mr_rtm_dumproute(struct sk_buff *skb, struct netlink_callback *cb,
struct mr_table *(*iter)(struct net *net,
struct mr_table *mrt),
int (*fill)(struct mr_table *mrt,
struct sk_buff *skb,
u32 portid, u32 seq, struct mr_mfc *c,
int cmd, int flags),
spinlock_t *lock, struct fib_dump_filter *filter);
int mr_dump(struct net *net, struct notifier_block *nb, unsigned short family,
int (*rules_dump)(struct net *net,
struct notifier_block *nb,
struct netlink_ext_ack *extack),
struct mr_table *(*mr_iter)(struct net *net,
struct mr_table *mrt),
struct netlink_ext_ack *extack);
#else
static inline 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)
{
}
static inline void *mr_mfc_find_parent(struct mr_table *mrt,
void *hasharg, int parent)
{
return NULL;
}
static inline void *mr_mfc_find_any_parent(struct mr_table *mrt,
int vifi)
{
return NULL;
}
static inline struct mr_mfc *mr_mfc_find_any(struct mr_table *mrt,
int vifi, void *hasharg)
{
return NULL;
}
static inline int mr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb,
struct mr_mfc *c, struct rtmsg *rtm)
{
return -EINVAL;
}
static inline int
mr_rtm_dumproute(struct sk_buff *skb, struct netlink_callback *cb,
struct mr_table *(*iter)(struct net *net,
struct mr_table *mrt),
int (*fill)(struct mr_table *mrt,
struct sk_buff *skb,
u32 portid, u32 seq, struct mr_mfc *c,
int cmd, int flags),
spinlock_t *lock, struct fib_dump_filter *filter)
{
return -EINVAL;
}
static inline int mr_dump(struct net *net, struct notifier_block *nb,
unsigned short family,
int (*rules_dump)(struct net *net,
struct notifier_block *nb,
struct netlink_ext_ack *extack),
struct mr_table *(*mr_iter)(struct net *net,
struct mr_table *mrt),
struct netlink_ext_ack *extack)
{
return -EINVAL;
}
#endif
static inline void *mr_mfc_find(struct mr_table *mrt, void *hasharg)
{
return mr_mfc_find_parent(mrt, hasharg, -1);
}
#ifdef CONFIG_PROC_FS
struct mr_vif_iter {
struct seq_net_private p;
struct mr_table *mrt;
int ct;
};
struct mr_mfc_iter {
struct seq_net_private p;
struct mr_table *mrt;
struct list_head *cache;
/* Lock protecting the mr_table's unresolved queue */
spinlock_t *lock;
};
#ifdef CONFIG_IP_MROUTE_COMMON
void *mr_vif_seq_idx(struct net *net, struct mr_vif_iter *iter, loff_t pos);
void *mr_vif_seq_next(struct seq_file *seq, void *v, loff_t *pos);
static inline void *mr_vif_seq_start(struct seq_file *seq, loff_t *pos)
{
return *pos ? mr_vif_seq_idx(seq_file_net(seq),
seq->private, *pos - 1)
: SEQ_START_TOKEN;
}
/* These actually return 'struct mr_mfc *', but to avoid need for explicit
* castings they simply return void.
*/
void *mr_mfc_seq_idx(struct net *net,
struct mr_mfc_iter *it, loff_t pos);
void *mr_mfc_seq_next(struct seq_file *seq, void *v,
loff_t *pos);
static inline void *mr_mfc_seq_start(struct seq_file *seq, loff_t *pos,
struct mr_table *mrt, spinlock_t *lock)
{
struct mr_mfc_iter *it = seq->private;
it->mrt = mrt;
it->cache = NULL;
it->lock = lock;
return *pos ? mr_mfc_seq_idx(seq_file_net(seq),
seq->private, *pos - 1)
: SEQ_START_TOKEN;
}
static inline void mr_mfc_seq_stop(struct seq_file *seq, void *v)
{
struct mr_mfc_iter *it = seq->private;
struct mr_table *mrt = it->mrt;
if (it->cache == &mrt->mfc_unres_queue)
spin_unlock_bh(it->lock);
else if (it->cache == &mrt->mfc_cache_list)
rcu_read_unlock();
}
#else
static inline void *mr_vif_seq_idx(struct net *net, struct mr_vif_iter *iter,
loff_t pos)
{
return NULL;
}
static inline void *mr_vif_seq_next(struct seq_file *seq,
void *v, loff_t *pos)
{
return NULL;
}
static inline void *mr_vif_seq_start(struct seq_file *seq, loff_t *pos)
{
return NULL;
}
static inline void *mr_mfc_seq_idx(struct net *net,
struct mr_mfc_iter *it, loff_t pos)
{
return NULL;
}
static inline void *mr_mfc_seq_next(struct seq_file *seq, void *v,
loff_t *pos)
{
return NULL;
}
static inline void *mr_mfc_seq_start(struct seq_file *seq, loff_t *pos,
struct mr_table *mrt, spinlock_t *lock)
{
return NULL;
}
static inline void mr_mfc_seq_stop(struct seq_file *seq, void *v)
{
}
#endif
#endif
#endif
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