Release 4.17 include/net/fib_rules.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __NET_FIB_RULES_H

#define __NET_FIB_RULES_H

#include <linux/types.h>
#include <linux/slab.h>
#include <linux/netdevice.h>
#include <linux/fib_rules.h>
#include <linux/refcount.h>
#include <net/flow.h>
#include <net/rtnetlink.h>
#include <net/fib_notifier.h>


struct fib_kuid_range {
	
kuid_t start;
	
kuid_t end;
};


struct fib_rule {
	
struct list_head	list;
	
int			iifindex;
	
int			oifindex;
	
u32			mark;
	
u32			mark_mask;
	
u32			flags;
	
u32			table;
	
u8			action;
	
u8			l3mdev;
	
u8                      proto;
	
u8			ip_proto;
	
u32			target;
	
__be64			tun_id;
	
struct fib_rule __rcu	*ctarget;
	
struct net		*fr_net;

	
refcount_t		refcnt;
	
u32			pref;
	
int			suppress_ifgroup;
	
int			suppress_prefixlen;
	
char			iifname[IFNAMSIZ];
	
char			oifname[IFNAMSIZ];
	
struct fib_kuid_range	uid_range;
	
struct fib_rule_port_range	sport_range;
	
struct fib_rule_port_range	dport_range;
	
struct rcu_head		rcu;
};


struct fib_lookup_arg {
	
void			*lookup_ptr;
	
const void		*lookup_data;
	
void			*result;
	
struct fib_rule		*rule;
	
u32			table;
	
int			flags;

#define FIB_LOOKUP_NOREF		1

#define FIB_LOOKUP_IGNORE_LINKSTATE	2
};


struct fib_rules_ops {
	
int			family;
	
struct list_head	list;
	
int			rule_size;
	
int			addr_size;
	
int			unresolved_rules;
	
int			nr_goto_rules;
	
unsigned int		fib_rules_seq;

	
int			(*action)(struct fib_rule *,
					  struct flowi *, int,
					  struct fib_lookup_arg *);
	
bool			(*suppress)(struct fib_rule *,
					    struct fib_lookup_arg *);
	
int			(*match)(struct fib_rule *,
					 struct flowi *, int);
	
int			(*configure)(struct fib_rule *,
					     struct sk_buff *,
					     struct fib_rule_hdr *,
					     struct nlattr **);
	
int			(*delete)(struct fib_rule *);
	
int			(*compare)(struct fib_rule *,
					   struct fib_rule_hdr *,
					   struct nlattr **);
	
int			(*fill)(struct fib_rule *, struct sk_buff *,
					struct fib_rule_hdr *);
	
size_t			(*nlmsg_payload)(struct fib_rule *);

	/* Called after modifications to the rules set, must flush
         * the route cache if one exists. */
	
void			(*flush_cache)(struct fib_rules_ops *ops);

	
int			nlgroup;
	
const struct nla_policy	*policy;
	
struct list_head	rules_list;
	
struct module		*owner;
	
struct net		*fro_net;
	
struct rcu_head		rcu;
};


struct fib_rule_notifier_info {
	
struct fib_notifier_info info; /* must be first */
	
struct fib_rule *rule;
};


#define FRA_GENERIC_POLICY \
	[FRA_IIFNAME]   = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, \
        [FRA_OIFNAME]   = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, \
        [FRA_PRIORITY]  = { .type = NLA_U32 }, \
        [FRA_FWMARK]    = { .type = NLA_U32 }, \
        [FRA_FWMASK]    = { .type = NLA_U32 }, \
        [FRA_TABLE]     = { .type = NLA_U32 }, \
        [FRA_SUPPRESS_PREFIXLEN] = { .type = NLA_U32 }, \
        [FRA_SUPPRESS_IFGROUP] = { .type = NLA_U32 }, \
        [FRA_GOTO]      = { .type = NLA_U32 }, \
        [FRA_L3MDEV]    = { .type = NLA_U8 }, \
        [FRA_UID_RANGE] = { .len = sizeof(struct fib_rule_uid_range) }, \
        [FRA_PROTOCOL]  = { .type = NLA_U8 }, \
        [FRA_IP_PROTO]  = { .type = NLA_U8 }, \
        [FRA_SPORT_RANGE] = { .len = sizeof(struct fib_rule_port_range) }, \
        [FRA_DPORT_RANGE] = { .len = sizeof(struct fib_rule_port_range) }




static inline void fib_rule_get(struct fib_rule *rule)
{
	refcount_inc(&rule->refcnt);
}

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static inline void fib_rule_put(struct fib_rule *rule)
{
	if (refcount_dec_and_test(&rule->refcnt))
		kfree_rcu(rule, rcu);
}

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#ifdef CONFIG_NET_L3_MASTER_DEV


static inline u32 fib_rule_get_table(struct fib_rule *rule,
				     struct fib_lookup_arg *arg)
{
	return rule->l3mdev ? arg->table : rule->table;
}
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#else


static inline u32 fib_rule_get_table(struct fib_rule *rule,
				     struct fib_lookup_arg *arg)
{
	return rule->table;
}
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#endif



static inline u32 frh_get_table(struct fib_rule_hdr *frh, struct nlattr **nla)
{
	if (nla[FRA_TABLE])
		return nla_get_u32(nla[FRA_TABLE]);
	return frh->table;
}

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static inline bool fib_rule_port_range_set(const struct fib_rule_port_range *range)
{
	return range->start != 0 && range->end != 0;
}

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static inline bool fib_rule_port_inrange(const struct fib_rule_port_range *a,
					 __be16 port)
{
	return ntohs(port) >= a->start &&
		ntohs(port) <= a->end;
}

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static inline bool fib_rule_port_range_valid(const struct fib_rule_port_range *a)
{
	return a->start != 0 && a->end != 0 && a->end < 0xffff &&
		a->start <= a->end;
}

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static inline bool fib_rule_port_range_compare(struct fib_rule_port_range *a,
					       struct fib_rule_port_range *b)
{
	return a->start == b->start &&
		a->end == b->end;
}

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static inline bool fib_rule_requires_fldissect(struct fib_rule *rule)
{
	return rule->ip_proto ||
		fib_rule_port_range_set(&rule->sport_range) ||
		fib_rule_port_range_set(&rule->dport_range);
}

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struct fib_rules_ops *fib_rules_register(const struct fib_rules_ops *,
					 struct net *);
void fib_rules_unregister(struct fib_rules_ops *);

int fib_rules_lookup(struct fib_rules_ops *, struct flowi *, int flags,
		     struct fib_lookup_arg *);
int fib_default_rule_add(struct fib_rules_ops *, u32 pref, u32 table,
			 u32 flags);
bool fib_rule_matchall(const struct fib_rule *rule);
int fib_rules_dump(struct net *net, struct notifier_block *nb, int family);
unsigned int fib_rules_seq_read(struct net *net, int family);

int fib_nl_newrule(struct sk_buff *skb, struct nlmsghdr *nlh,
		   struct netlink_ext_ack *extack);
int fib_nl_delrule(struct sk_buff *skb, struct nlmsghdr *nlh,
		   struct netlink_ext_ack *extack);
#endif
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Directory: include/net

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