diff options
Diffstat (limited to 'include/net/fib_rules.h')
| -rw-r--r-- | include/net/fib_rules.h | 226 |
1 files changed, 226 insertions, 0 deletions
diff --git a/include/net/fib_rules.h b/include/net/fib_rules.h new file mode 100644 index 000000000..bd07484ab --- /dev/null +++ b/include/net/fib_rules.h @@ -0,0 +1,226 @@ +/* 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> +#include <linux/indirect_call_wrapper.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 *, int, + 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 **, + struct netlink_ext_ack *); + 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_UNSPEC] = { .strict_start_type = FRA_DPORT_RANGE + 1 }, \ + [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_TUN_ID] = { .type = NLA_U64 }, \ + [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); +} + +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->iifindex != LOOPBACK_IFINDEX && (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, + struct netlink_ext_ack *extack); +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); + +INDIRECT_CALLABLE_DECLARE(int fib6_rule_match(struct fib_rule *rule, + struct flowi *fl, int flags)); +INDIRECT_CALLABLE_DECLARE(int fib4_rule_match(struct fib_rule *rule, + struct flowi *fl, int flags)); + +INDIRECT_CALLABLE_DECLARE(int fib6_rule_action(struct fib_rule *rule, + struct flowi *flp, int flags, + struct fib_lookup_arg *arg)); +INDIRECT_CALLABLE_DECLARE(int fib4_rule_action(struct fib_rule *rule, + struct flowi *flp, int flags, + struct fib_lookup_arg *arg)); + +INDIRECT_CALLABLE_DECLARE(bool fib6_rule_suppress(struct fib_rule *rule, + int flags, + struct fib_lookup_arg *arg)); +INDIRECT_CALLABLE_DECLARE(bool fib4_rule_suppress(struct fib_rule *rule, + int flags, + struct fib_lookup_arg *arg)); +#endif |