linux/include/net/fib_rules.h
Ido Schimmel 1b2a444085 net: fib_rules: Implement notification logic in core
Unlike the routing tables, the FIB rules share a common core, so instead
of replicating the same logic for each address family we can simply dump
the rules and send notifications from the core itself.

To protect the integrity of the dump, a rules-specific sequence counter
is added for each address family and incremented whenever a rule is
added or deleted (under RTNL).

Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2017-08-03 15:35:59 -07:00

161 lines
4.1 KiB
C

#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;
/* 2 bytes hole, try to use */
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 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) }
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;
}
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