225 lines
6.3 KiB
C
225 lines
6.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __NET_FIB_RULES_H
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#define __NET_FIB_RULES_H
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#include <linux/types.h>
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#include <linux/slab.h>
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#include <linux/netdevice.h>
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#include <linux/fib_rules.h>
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#include <linux/refcount.h>
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#include <net/flow.h>
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#include <net/rtnetlink.h>
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#include <net/fib_notifier.h>
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#include <linux/indirect_call_wrapper.h>
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struct fib_kuid_range {
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kuid_t start;
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kuid_t end;
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};
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struct fib_rule {
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struct list_head list;
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int iifindex;
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int oifindex;
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u32 mark;
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u32 mark_mask;
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u32 flags;
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u32 table;
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u8 action;
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u8 l3mdev;
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u8 proto;
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u8 ip_proto;
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u32 target;
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__be64 tun_id;
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struct fib_rule __rcu *ctarget;
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struct net *fr_net;
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refcount_t refcnt;
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u32 pref;
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int suppress_ifgroup;
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int suppress_prefixlen;
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char iifname[IFNAMSIZ];
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char oifname[IFNAMSIZ];
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struct fib_kuid_range uid_range;
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struct fib_rule_port_range sport_range;
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struct fib_rule_port_range dport_range;
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struct rcu_head rcu;
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};
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struct fib_lookup_arg {
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void *lookup_ptr;
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const void *lookup_data;
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void *result;
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struct fib_rule *rule;
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u32 table;
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int flags;
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#define FIB_LOOKUP_NOREF 1
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#define FIB_LOOKUP_IGNORE_LINKSTATE 2
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};
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struct fib_rules_ops {
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int family;
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struct list_head list;
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int rule_size;
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int addr_size;
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int unresolved_rules;
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int nr_goto_rules;
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unsigned int fib_rules_seq;
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int (*action)(struct fib_rule *,
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struct flowi *, int,
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struct fib_lookup_arg *);
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bool (*suppress)(struct fib_rule *,
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struct fib_lookup_arg *);
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int (*match)(struct fib_rule *,
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struct flowi *, int);
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int (*configure)(struct fib_rule *,
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struct sk_buff *,
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struct fib_rule_hdr *,
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struct nlattr **,
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struct netlink_ext_ack *);
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int (*delete)(struct fib_rule *);
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int (*compare)(struct fib_rule *,
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struct fib_rule_hdr *,
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struct nlattr **);
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int (*fill)(struct fib_rule *, struct sk_buff *,
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struct fib_rule_hdr *);
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size_t (*nlmsg_payload)(struct fib_rule *);
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/* Called after modifications to the rules set, must flush
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* the route cache if one exists. */
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void (*flush_cache)(struct fib_rules_ops *ops);
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int nlgroup;
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const struct nla_policy *policy;
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struct list_head rules_list;
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struct module *owner;
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struct net *fro_net;
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struct rcu_head rcu;
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};
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struct fib_rule_notifier_info {
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struct fib_notifier_info info; /* must be first */
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struct fib_rule *rule;
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};
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#define FRA_GENERIC_POLICY \
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[FRA_UNSPEC] = { .strict_start_type = FRA_DPORT_RANGE + 1 }, \
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[FRA_IIFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, \
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[FRA_OIFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, \
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[FRA_PRIORITY] = { .type = NLA_U32 }, \
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[FRA_FWMARK] = { .type = NLA_U32 }, \
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[FRA_TUN_ID] = { .type = NLA_U64 }, \
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[FRA_FWMASK] = { .type = NLA_U32 }, \
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[FRA_TABLE] = { .type = NLA_U32 }, \
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[FRA_SUPPRESS_PREFIXLEN] = { .type = NLA_U32 }, \
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[FRA_SUPPRESS_IFGROUP] = { .type = NLA_U32 }, \
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[FRA_GOTO] = { .type = NLA_U32 }, \
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[FRA_L3MDEV] = { .type = NLA_U8 }, \
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[FRA_UID_RANGE] = { .len = sizeof(struct fib_rule_uid_range) }, \
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[FRA_PROTOCOL] = { .type = NLA_U8 }, \
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[FRA_IP_PROTO] = { .type = NLA_U8 }, \
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[FRA_SPORT_RANGE] = { .len = sizeof(struct fib_rule_port_range) }, \
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[FRA_DPORT_RANGE] = { .len = sizeof(struct fib_rule_port_range) }
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static inline void fib_rule_get(struct fib_rule *rule)
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{
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refcount_inc(&rule->refcnt);
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}
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static inline void fib_rule_put(struct fib_rule *rule)
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{
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if (refcount_dec_and_test(&rule->refcnt))
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kfree_rcu(rule, rcu);
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}
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#ifdef CONFIG_NET_L3_MASTER_DEV
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static inline u32 fib_rule_get_table(struct fib_rule *rule,
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struct fib_lookup_arg *arg)
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{
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return rule->l3mdev ? arg->table : rule->table;
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}
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#else
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static inline u32 fib_rule_get_table(struct fib_rule *rule,
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struct fib_lookup_arg *arg)
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{
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return rule->table;
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}
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#endif
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static inline u32 frh_get_table(struct fib_rule_hdr *frh, struct nlattr **nla)
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{
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if (nla[FRA_TABLE])
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return nla_get_u32(nla[FRA_TABLE]);
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return frh->table;
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}
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static inline bool fib_rule_port_range_set(const struct fib_rule_port_range *range)
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{
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return range->start != 0 && range->end != 0;
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}
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static inline bool fib_rule_port_inrange(const struct fib_rule_port_range *a,
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__be16 port)
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{
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return ntohs(port) >= a->start &&
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ntohs(port) <= a->end;
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}
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static inline bool fib_rule_port_range_valid(const struct fib_rule_port_range *a)
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{
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return a->start != 0 && a->end != 0 && a->end < 0xffff &&
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a->start <= a->end;
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}
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static inline bool fib_rule_port_range_compare(struct fib_rule_port_range *a,
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struct fib_rule_port_range *b)
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{
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return a->start == b->start &&
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a->end == b->end;
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}
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static inline bool fib_rule_requires_fldissect(struct fib_rule *rule)
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{
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return rule->iifindex != LOOPBACK_IFINDEX && (rule->ip_proto ||
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fib_rule_port_range_set(&rule->sport_range) ||
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fib_rule_port_range_set(&rule->dport_range));
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}
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struct fib_rules_ops *fib_rules_register(const struct fib_rules_ops *,
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struct net *);
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void fib_rules_unregister(struct fib_rules_ops *);
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int fib_rules_lookup(struct fib_rules_ops *, struct flowi *, int flags,
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struct fib_lookup_arg *);
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int fib_default_rule_add(struct fib_rules_ops *, u32 pref, u32 table,
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u32 flags);
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bool fib_rule_matchall(const struct fib_rule *rule);
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int fib_rules_dump(struct net *net, struct notifier_block *nb, int family,
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struct netlink_ext_ack *extack);
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unsigned int fib_rules_seq_read(struct net *net, int family);
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int fib_nl_newrule(struct sk_buff *skb, struct nlmsghdr *nlh,
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struct netlink_ext_ack *extack);
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int fib_nl_delrule(struct sk_buff *skb, struct nlmsghdr *nlh,
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struct netlink_ext_ack *extack);
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INDIRECT_CALLABLE_DECLARE(int fib6_rule_match(struct fib_rule *rule,
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struct flowi *fl, int flags));
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INDIRECT_CALLABLE_DECLARE(int fib4_rule_match(struct fib_rule *rule,
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struct flowi *fl, int flags));
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INDIRECT_CALLABLE_DECLARE(int fib6_rule_action(struct fib_rule *rule,
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struct flowi *flp, int flags,
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struct fib_lookup_arg *arg));
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INDIRECT_CALLABLE_DECLARE(int fib4_rule_action(struct fib_rule *rule,
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struct flowi *flp, int flags,
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struct fib_lookup_arg *arg));
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INDIRECT_CALLABLE_DECLARE(bool fib6_rule_suppress(struct fib_rule *rule,
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struct fib_lookup_arg *arg));
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INDIRECT_CALLABLE_DECLARE(bool fib4_rule_suppress(struct fib_rule *rule,
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struct fib_lookup_arg *arg));
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#endif
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