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/* 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;
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 }
static inline void fib_rule_get(struct fib_rule *rule)
{
refcount_inc(&rule->refcnt);
}
static inline void fib_rule_put(struct fib_rule *rule)
{
if (refcount_dec_and_test(&rule->refcnt))
kfree_rcu(rule, rcu);
}
#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;
}
#else
static inline u32 fib_rule_get_table(struct fib_rule *rule,
struct fib_lookup_arg *arg)
{
return rule->table;
}
#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;
}
static inline bool fib_rule_port_range_set(const struct fib_rule_port_range *range)
{
return range->start != 0 && range->end != 0;
}
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;
}
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;
}
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;
}
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);
}
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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