device:04
     ˆÂÆ„›iïÁ¿Ã 1    #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 *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,
				       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,
					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

#define VIF_EXISTS(_mrt, _idx) (!!((_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;
			atomic_long_t bytes;
			atomic_long_t pkt;
			atomic_long_t 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(s