| /* SPDX-License-Identifier: GPL-2.0-or-later */ |
| /* |
| * INET An implementation of the TCP/IP protocol suite for the LINUX |
| * operating system. INET is implemented using the BSD Socket |
| * interface as the means of communication with the user level. |
| * |
| * Definitions for the Forwarding Information Base. |
| * |
| * Authors: A.N.Kuznetsov, <kuznet@ms2.inr.ac.ru> |
| */ |
| |
| #ifndef _NET_IP_FIB_H |
| #define _NET_IP_FIB_H |
| |
| #include <net/flow.h> |
| #include <linux/seq_file.h> |
| #include <linux/rcupdate.h> |
| #include <net/fib_notifier.h> |
| #include <net/fib_rules.h> |
| #include <net/inetpeer.h> |
| #include <linux/percpu.h> |
| #include <linux/notifier.h> |
| #include <linux/refcount.h> |
| |
| struct fib_config { |
| u8 fc_dst_len; |
| u8 fc_tos; |
| u8 fc_protocol; |
| u8 fc_scope; |
| u8 fc_type; |
| u8 fc_gw_family; |
| /* 2 bytes unused */ |
| u32 fc_table; |
| __be32 fc_dst; |
| union { |
| __be32 fc_gw4; |
| struct in6_addr fc_gw6; |
| }; |
| int fc_oif; |
| u32 fc_flags; |
| u32 fc_priority; |
| __be32 fc_prefsrc; |
| u32 fc_nh_id; |
| struct nlattr *fc_mx; |
| struct rtnexthop *fc_mp; |
| int fc_mx_len; |
| int fc_mp_len; |
| u32 fc_flow; |
| u32 fc_nlflags; |
| struct nl_info fc_nlinfo; |
| struct nlattr *fc_encap; |
| u16 fc_encap_type; |
| }; |
| |
| struct fib_info; |
| struct rtable; |
| |
| struct fib_nh_exception { |
| struct fib_nh_exception __rcu *fnhe_next; |
| int fnhe_genid; |
| __be32 fnhe_daddr; |
| u32 fnhe_pmtu; |
| bool fnhe_mtu_locked; |
| __be32 fnhe_gw; |
| unsigned long fnhe_expires; |
| struct rtable __rcu *fnhe_rth_input; |
| struct rtable __rcu *fnhe_rth_output; |
| unsigned long fnhe_stamp; |
| struct rcu_head rcu; |
| }; |
| |
| struct fnhe_hash_bucket { |
| struct fib_nh_exception __rcu *chain; |
| }; |
| |
| #define FNHE_HASH_SHIFT 11 |
| #define FNHE_HASH_SIZE (1 << FNHE_HASH_SHIFT) |
| #define FNHE_RECLAIM_DEPTH 5 |
| |
| struct fib_nh_common { |
| struct net_device *nhc_dev; |
| int nhc_oif; |
| unsigned char nhc_scope; |
| u8 nhc_family; |
| u8 nhc_gw_family; |
| unsigned char nhc_flags; |
| struct lwtunnel_state *nhc_lwtstate; |
| |
| union { |
| __be32 ipv4; |
| struct in6_addr ipv6; |
| } nhc_gw; |
| |
| int nhc_weight; |
| atomic_t nhc_upper_bound; |
| |
| /* v4 specific, but allows fib6_nh with v4 routes */ |
| struct rtable __rcu * __percpu *nhc_pcpu_rth_output; |
| struct rtable __rcu *nhc_rth_input; |
| struct fnhe_hash_bucket __rcu *nhc_exceptions; |
| }; |
| |
| struct fib_nh { |
| struct fib_nh_common nh_common; |
| struct hlist_node nh_hash; |
| struct fib_info *nh_parent; |
| #ifdef CONFIG_IP_ROUTE_CLASSID |
| __u32 nh_tclassid; |
| #endif |
| __be32 nh_saddr; |
| int nh_saddr_genid; |
| #define fib_nh_family nh_common.nhc_family |
| #define fib_nh_dev nh_common.nhc_dev |
| #define fib_nh_oif nh_common.nhc_oif |
| #define fib_nh_flags nh_common.nhc_flags |
| #define fib_nh_lws nh_common.nhc_lwtstate |
| #define fib_nh_scope nh_common.nhc_scope |
| #define fib_nh_gw_family nh_common.nhc_gw_family |
| #define fib_nh_gw4 nh_common.nhc_gw.ipv4 |
| #define fib_nh_gw6 nh_common.nhc_gw.ipv6 |
| #define fib_nh_weight nh_common.nhc_weight |
| #define fib_nh_upper_bound nh_common.nhc_upper_bound |
| }; |
| |
| /* |
| * This structure contains data shared by many of routes. |
| */ |
| |
| struct nexthop; |
| |
| struct fib_info { |
| struct hlist_node fib_hash; |
| struct hlist_node fib_lhash; |
| struct list_head nh_list; |
| struct net *fib_net; |
| int fib_treeref; |
| refcount_t fib_clntref; |
| unsigned int fib_flags; |
| unsigned char fib_dead; |
| unsigned char fib_protocol; |
| unsigned char fib_scope; |
| unsigned char fib_type; |
| __be32 fib_prefsrc; |
| u32 fib_tb_id; |
| u32 fib_priority; |
| struct dst_metrics *fib_metrics; |
| #define fib_mtu fib_metrics->metrics[RTAX_MTU-1] |
| #define fib_window fib_metrics->metrics[RTAX_WINDOW-1] |
| #define fib_rtt fib_metrics->metrics[RTAX_RTT-1] |
| #define fib_advmss fib_metrics->metrics[RTAX_ADVMSS-1] |
| int fib_nhs; |
| bool fib_nh_is_v6; |
| bool nh_updated; |
| struct nexthop *nh; |
| struct rcu_head rcu; |
| struct fib_nh fib_nh[0]; |
| }; |
| |
| |
| #ifdef CONFIG_IP_MULTIPLE_TABLES |
| struct fib_rule; |
| #endif |
| |
| struct fib_table; |
| struct fib_result { |
| __be32 prefix; |
| unsigned char prefixlen; |
| unsigned char nh_sel; |
| unsigned char type; |
| unsigned char scope; |
| u32 tclassid; |
| struct fib_nh_common *nhc; |
| struct fib_info *fi; |
| struct fib_table *table; |
| struct hlist_head *fa_head; |
| }; |
| |
| struct fib_result_nl { |
| __be32 fl_addr; /* To be looked up*/ |
| u32 fl_mark; |
| unsigned char fl_tos; |
| unsigned char fl_scope; |
| unsigned char tb_id_in; |
| |
| unsigned char tb_id; /* Results */ |
| unsigned char prefixlen; |
| unsigned char nh_sel; |
| unsigned char type; |
| unsigned char scope; |
| int err; |
| }; |
| |
| #ifdef CONFIG_IP_MULTIPLE_TABLES |
| #define FIB_TABLE_HASHSZ 256 |
| #else |
| #define FIB_TABLE_HASHSZ 2 |
| #endif |
| |
| __be32 fib_info_update_nhc_saddr(struct net *net, struct fib_nh_common *nhc, |
| unsigned char scope); |
| __be32 fib_result_prefsrc(struct net *net, struct fib_result *res); |
| |
| #define FIB_RES_NHC(res) ((res).nhc) |
| #define FIB_RES_DEV(res) (FIB_RES_NHC(res)->nhc_dev) |
| #define FIB_RES_OIF(res) (FIB_RES_NHC(res)->nhc_oif) |
| |
| struct fib_entry_notifier_info { |
| struct fib_notifier_info info; /* must be first */ |
| u32 dst; |
| int dst_len; |
| struct fib_info *fi; |
| u8 tos; |
| u8 type; |
| u32 tb_id; |
| }; |
| |
| struct fib_nh_notifier_info { |
| struct fib_notifier_info info; /* must be first */ |
| struct fib_nh *fib_nh; |
| }; |
| |
| int call_fib4_notifier(struct notifier_block *nb, |
| enum fib_event_type event_type, |
| struct fib_notifier_info *info); |
| int call_fib4_notifiers(struct net *net, enum fib_event_type event_type, |
| struct fib_notifier_info *info); |
| |
| int __net_init fib4_notifier_init(struct net *net); |
| void __net_exit fib4_notifier_exit(struct net *net); |
| |
| void fib_info_notify_update(struct net *net, struct nl_info *info); |
| int fib_notify(struct net *net, struct notifier_block *nb, |
| struct netlink_ext_ack *extack); |
| |
| struct fib_table { |
| struct hlist_node tb_hlist; |
| u32 tb_id; |
| int tb_num_default; |
| struct rcu_head rcu; |
| unsigned long *tb_data; |
| unsigned long __data[0]; |
| }; |
| |
| struct fib_dump_filter { |
| u32 table_id; |
| /* filter_set is an optimization that an entry is set */ |
| bool filter_set; |
| bool dump_all_families; |
| bool dump_routes; |
| bool dump_exceptions; |
| unsigned char protocol; |
| unsigned char rt_type; |
| unsigned int flags; |
| struct net_device *dev; |
| }; |
| |
| int fib_table_lookup(struct fib_table *tb, const struct flowi4 *flp, |
| struct fib_result *res, int fib_flags); |
| int fib_table_insert(struct net *, struct fib_table *, struct fib_config *, |
| struct netlink_ext_ack *extack); |
| int fib_table_delete(struct net *, struct fib_table *, struct fib_config *, |
| struct netlink_ext_ack *extack); |
| int fib_table_dump(struct fib_table *table, struct sk_buff *skb, |
| struct netlink_callback *cb, struct fib_dump_filter *filter); |
| int fib_table_flush(struct net *net, struct fib_table *table, bool flush_all); |
| struct fib_table *fib_trie_unmerge(struct fib_table *main_tb); |
| void fib_table_flush_external(struct fib_table *table); |
| void fib_free_table(struct fib_table *tb); |
| |
| #ifndef CONFIG_IP_MULTIPLE_TABLES |
| |
| #define TABLE_LOCAL_INDEX (RT_TABLE_LOCAL & (FIB_TABLE_HASHSZ - 1)) |
| #define TABLE_MAIN_INDEX (RT_TABLE_MAIN & (FIB_TABLE_HASHSZ - 1)) |
| |
| static inline struct fib_table *fib_get_table(struct net *net, u32 id) |
| { |
| struct hlist_node *tb_hlist; |
| struct hlist_head *ptr; |
| |
| ptr = id == RT_TABLE_LOCAL ? |
| &net->ipv4.fib_table_hash[TABLE_LOCAL_INDEX] : |
| &net->ipv4.fib_table_hash[TABLE_MAIN_INDEX]; |
| |
| tb_hlist = rcu_dereference_rtnl(hlist_first_rcu(ptr)); |
| |
| return hlist_entry(tb_hlist, struct fib_table, tb_hlist); |
| } |
| |
| static inline struct fib_table *fib_new_table(struct net *net, u32 id) |
| { |
| return fib_get_table(net, id); |
| } |
| |
| static inline int fib_lookup(struct net *net, const struct flowi4 *flp, |
| struct fib_result *res, unsigned int flags) |
| { |
| struct fib_table *tb; |
| int err = -ENETUNREACH; |
| |
| rcu_read_lock(); |
| |
| tb = fib_get_table(net, RT_TABLE_MAIN); |
| if (tb) |
| err = fib_table_lookup(tb, flp, res, flags | FIB_LOOKUP_NOREF); |
| |
| if (err == -EAGAIN) |
| err = -ENETUNREACH; |
| |
| rcu_read_unlock(); |
| |
| return err; |
| } |
| |
| static inline bool fib4_has_custom_rules(const struct net *net) |
| { |
| return false; |
| } |
| |
| static inline bool fib4_rule_default(const struct fib_rule *rule) |
| { |
| return true; |
| } |
| |
| static inline int fib4_rules_dump(struct net *net, struct notifier_block *nb, |
| struct netlink_ext_ack *extack) |
| { |
| return 0; |
| } |
| |
| static inline unsigned int fib4_rules_seq_read(struct net *net) |
| { |
| return 0; |
| } |
| |
| static inline bool fib4_rules_early_flow_dissect(struct net *net, |
| struct sk_buff *skb, |
| struct flowi4 *fl4, |
| struct flow_keys *flkeys) |
| { |
| return false; |
| } |
| #else /* CONFIG_IP_MULTIPLE_TABLES */ |
| int __net_init fib4_rules_init(struct net *net); |
| void __net_exit fib4_rules_exit(struct net *net); |
| |
| struct fib_table *fib_new_table(struct net *net, u32 id); |
| struct fib_table *fib_get_table(struct net *net, u32 id); |
| |
| int __fib_lookup(struct net *net, struct flowi4 *flp, |
| struct fib_result *res, unsigned int flags); |
| |
| static inline int fib_lookup(struct net *net, struct flowi4 *flp, |
| struct fib_result *res, unsigned int flags) |
| { |
| struct fib_table *tb; |
| int err = -ENETUNREACH; |
| |
| flags |= FIB_LOOKUP_NOREF; |
| if (net->ipv4.fib_has_custom_rules) |
| return __fib_lookup(net, flp, res, flags); |
| |
| rcu_read_lock(); |
| |
| res->tclassid = 0; |
| |
| tb = rcu_dereference_rtnl(net->ipv4.fib_main); |
| if (tb) |
| err = fib_table_lookup(tb, flp, res, flags); |
| |
| if (!err) |
| goto out; |
| |
| tb = rcu_dereference_rtnl(net->ipv4.fib_default); |
| if (tb) |
| err = fib_table_lookup(tb, flp, res, flags); |
| |
| out: |
| if (err == -EAGAIN) |
| err = -ENETUNREACH; |
| |
| rcu_read_unlock(); |
| |
| return err; |
| } |
| |
| static inline bool fib4_has_custom_rules(const struct net *net) |
| { |
| return net->ipv4.fib_has_custom_rules; |
| } |
| |
| bool fib4_rule_default(const struct fib_rule *rule); |
| int fib4_rules_dump(struct net *net, struct notifier_block *nb, |
| struct netlink_ext_ack *extack); |
| unsigned int fib4_rules_seq_read(struct net *net); |
| |
| static inline bool fib4_rules_early_flow_dissect(struct net *net, |
| struct sk_buff *skb, |
| struct flowi4 *fl4, |
| struct flow_keys *flkeys) |
| { |
| unsigned int flag = FLOW_DISSECTOR_F_STOP_AT_ENCAP; |
| |
| if (!net->ipv4.fib_rules_require_fldissect) |
| return false; |
| |
| skb_flow_dissect_flow_keys(skb, flkeys, flag); |
| fl4->fl4_sport = flkeys->ports.src; |
| fl4->fl4_dport = flkeys->ports.dst; |
| fl4->flowi4_proto = flkeys->basic.ip_proto; |
| |
| return true; |
| } |
| |
| #endif /* CONFIG_IP_MULTIPLE_TABLES */ |
| |
| /* Exported by fib_frontend.c */ |
| extern const struct nla_policy rtm_ipv4_policy[]; |
| void ip_fib_init(void); |
| int fib_gw_from_via(struct fib_config *cfg, struct nlattr *nla, |
| struct netlink_ext_ack *extack); |
| __be32 fib_compute_spec_dst(struct sk_buff *skb); |
| bool fib_info_nh_uses_dev(struct fib_info *fi, const struct net_device *dev); |
| int fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst, |
| u8 tos, int oif, struct net_device *dev, |
| struct in_device *idev, u32 *itag); |
| #ifdef CONFIG_IP_ROUTE_CLASSID |
| static inline int fib_num_tclassid_users(struct net *net) |
| { |
| return net->ipv4.fib_num_tclassid_users; |
| } |
| #else |
| static inline int fib_num_tclassid_users(struct net *net) |
| { |
| return 0; |
| } |
| #endif |
| int fib_unmerge(struct net *net); |
| |
| /* Exported by fib_semantics.c */ |
| int ip_fib_check_default(__be32 gw, struct net_device *dev); |
| int fib_sync_down_dev(struct net_device *dev, unsigned long event, bool force); |
| int fib_sync_down_addr(struct net_device *dev, __be32 local); |
| int fib_sync_up(struct net_device *dev, unsigned char nh_flags); |
| void fib_sync_mtu(struct net_device *dev, u32 orig_mtu); |
| void fib_nhc_update_mtu(struct fib_nh_common *nhc, u32 new, u32 orig); |
| |
| #ifdef CONFIG_IP_ROUTE_MULTIPATH |
| int fib_multipath_hash(const struct net *net, const struct flowi4 *fl4, |
| const struct sk_buff *skb, struct flow_keys *flkeys); |
| #endif |
| int fib_check_nh(struct net *net, struct fib_nh *nh, u32 table, u8 scope, |
| struct netlink_ext_ack *extack); |
| void fib_select_multipath(struct fib_result *res, int hash); |
| void fib_select_path(struct net *net, struct fib_result *res, |
| struct flowi4 *fl4, const struct sk_buff *skb); |
| |
| int fib_nh_init(struct net *net, struct fib_nh *fib_nh, |
| struct fib_config *cfg, int nh_weight, |
| struct netlink_ext_ack *extack); |
| void fib_nh_release(struct net *net, struct fib_nh *fib_nh); |
| int fib_nh_common_init(struct fib_nh_common *nhc, struct nlattr *fc_encap, |
| u16 fc_encap_type, void *cfg, gfp_t gfp_flags, |
| struct netlink_ext_ack *extack); |
| void fib_nh_common_release(struct fib_nh_common *nhc); |
| |
| /* Exported by fib_trie.c */ |
| void fib_trie_init(void); |
| struct fib_table *fib_trie_table(u32 id, struct fib_table *alias); |
| |
| static inline void fib_combine_itag(u32 *itag, const struct fib_result *res) |
| { |
| #ifdef CONFIG_IP_ROUTE_CLASSID |
| struct fib_nh_common *nhc = res->nhc; |
| #ifdef CONFIG_IP_MULTIPLE_TABLES |
| u32 rtag; |
| #endif |
| if (nhc->nhc_family == AF_INET) { |
| struct fib_nh *nh; |
| |
| nh = container_of(nhc, struct fib_nh, nh_common); |
| *itag = nh->nh_tclassid << 16; |
| } else { |
| *itag = 0; |
| } |
| |
| #ifdef CONFIG_IP_MULTIPLE_TABLES |
| rtag = res->tclassid; |
| if (*itag == 0) |
| *itag = (rtag<<16); |
| *itag |= (rtag>>16); |
| #endif |
| #endif |
| } |
| |
| void fib_flush(struct net *net); |
| void free_fib_info(struct fib_info *fi); |
| |
| static inline void fib_info_hold(struct fib_info *fi) |
| { |
| refcount_inc(&fi->fib_clntref); |
| } |
| |
| static inline void fib_info_put(struct fib_info *fi) |
| { |
| if (refcount_dec_and_test(&fi->fib_clntref)) |
| free_fib_info(fi); |
| } |
| |
| #ifdef CONFIG_PROC_FS |
| int __net_init fib_proc_init(struct net *net); |
| void __net_exit fib_proc_exit(struct net *net); |
| #else |
| static inline int fib_proc_init(struct net *net) |
| { |
| return 0; |
| } |
| static inline void fib_proc_exit(struct net *net) |
| { |
| } |
| #endif |
| |
| u32 ip_mtu_from_fib_result(struct fib_result *res, __be32 daddr); |
| |
| int ip_valid_fib_dump_req(struct net *net, const struct nlmsghdr *nlh, |
| struct fib_dump_filter *filter, |
| struct netlink_callback *cb); |
| |
| int fib_nexthop_info(struct sk_buff *skb, const struct fib_nh_common *nh, |
| u8 rt_family, unsigned char *flags, bool skip_oif); |
| int fib_add_nexthop(struct sk_buff *skb, const struct fib_nh_common *nh, |
| int nh_weight, u8 rt_family); |
| #endif /* _NET_FIB_H */ |