ipmr, ip6mr: Unite creation of new mr_table

[linux-2.6-block.git] / include / linux / mroute.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __LINUX_MROUTE_H
#define __LINUX_MROUTE_H

#include <linux/in.h>
#include <linux/pim.h>
#include <net/fib_rules.h>
#include <net/fib_notifier.h>
#include <uapi/linux/mroute.h>
#include <linux/mroute_base.h>

#ifdef CONFIG_IP_MROUTE
static inline int ip_mroute_opt(int opt)
{
	return opt >= MRT_BASE && opt <= MRT_MAX;
}

int ip_mroute_setsockopt(struct sock *, int, char __user *, unsigned int);
int ip_mroute_getsockopt(struct sock *, int, char __user *, int __user *);
int ipmr_ioctl(struct sock *sk, int cmd, void __user *arg);
int ipmr_compat_ioctl(struct sock *sk, unsigned int cmd, void __user *arg);
int ip_mr_init(void);
bool ipmr_rule_default(const struct fib_rule *rule);
#else
static inline int ip_mroute_setsockopt(struct sock *sock, int optname,
				       char __user *optval, unsigned int optlen)
{
	return -ENOPROTOOPT;
}

static inline int ip_mroute_getsockopt(struct sock *sock, int optname,
				       char __user *optval, int __user *optlen)
{
	return -ENOPROTOOPT;
}

static inline int ipmr_ioctl(struct sock *sk, int cmd, void __user *arg)
{
	return -ENOIOCTLCMD;
}

static inline int ip_mr_init(void)
{
	return 0;
}

static inline int ip_mroute_opt(int opt)
{
	return 0;
}

static inline bool ipmr_rule_default(const struct fib_rule *rule)
{
	return true;
}
#endif

struct vif_entry_notifier_info {
	struct fib_notifier_info info;
	struct net_device *dev;
	vifi_t vif_index;
	unsigned short vif_flags;
	u32 tb_id;
};

#define VIFF_STATIC 0x8000

/* 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 mfc_cache_cmp_arg {
	__be32 mfc_mcastgrp;
	__be32 mfc_origin;
};

/**
 * struct mfc_cache - multicast routing entries
 * @mnode: rhashtable list
 * @mfc_mcastgrp: destination multicast group address
 * @mfc_origin: source address
 * @cmparg: used for rhashtable comparisons
 * @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
 */
struct mfc_cache {
	struct rhlist_head mnode;
	union {
		struct {
			__be32 mfc_mcastgrp;
			__be32 mfc_origin;
		};
		struct mfc_cache_cmp_arg cmparg;
	};
	vifi_t 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;
};

struct mfc_entry_notifier_info {
	struct fib_notifier_info info;
	struct mfc_cache *mfc;
	u32 tb_id;
};

struct rtmsg;
int ipmr_get_route(struct net *net, struct sk_buff *skb,
		   __be32 saddr, __be32 daddr,
		   struct rtmsg *rtm, u32 portid);

#ifdef CONFIG_IP_MROUTE
void ipmr_cache_free(struct mfc_cache *mfc_cache);
#else
static inline void ipmr_cache_free(struct mfc_cache *mfc_cache)
{
}
#endif

static inline void ipmr_cache_put(struct mfc_cache *c)
{
	if (refcount_dec_and_test(&c->mfc_un.res.refcount))
		ipmr_cache_free(c);
}
static inline void ipmr_cache_hold(struct mfc_cache *c)
{
	refcount_inc(&c->mfc_un.res.refcount);
}

#endif