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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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#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/inet_dscp.h>#include <net/inetpeer.h>#include <linux/percpu.h>#include <linux/notifier.h>#include <linux/refcount.h>#include <linux/ip.h>#include <linux/in_route.h>
struct fib_config { u8 fc_dst_len; dscp_t fc_dscp; 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; netdevice_tracker nhc_dev_tracker; 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_dev_tracker nh_common.nhc_dev_tracker#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; refcount_t 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; bool pfsrc_removed; struct nexthop *nh; struct rcu_head rcu; struct fib_nh fib_nh[] __counted_by(fib_nhs);};
int __net_init fib4_semantics_init(struct net *net);void __net_exit fib4_semantics_exit(struct net *net);
#ifdef CONFIG_IP_MULTIPLE_TABLESstruct 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; dscp_t dscp; 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_rt_info { struct fib_info *fi; u32 tb_id; __be32 dst; int dst_len; dscp_t dscp; u8 type; u8 offload:1, trap:1, offload_failed:1, unused:5;};
struct fib_entry_notifier_info { struct fib_notifier_info info; /* must be first */ u32 dst; int dst_len; struct fib_info *fi; dscp_t dscp; 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[];};
struct fib_dump_filter { u32 table_id; /* filter_set is an optimization that an entry is set */ bool filter_set; 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(const 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 = -EAGAIN;
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 != -EAGAIN) goto out;
tb = rcu_dereference_rtnl(net->ipv4.fib_default); if (tb) err = fib_table_lookup(tb, flp, res, flags);
if (err == -EAGAIN) err = -ENETUNREACH;out: 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(const 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;
memset(flkeys, 0, sizeof(*flkeys)); __skb_flow_dissect(net, skb, &flow_keys_dissector, flkeys, NULL, 0, 0, 0, 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 */
static inline bool fib_dscp_masked_match(dscp_t dscp, const struct flowi4 *fl4){ return dscp == (fl4->flowi4_dscp & INET_DSCP_LEGACY_TOS_MASK);}
/* 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, dscp_t dscp, int oif, struct net_device *dev, struct in_device *idev, u32 *itag);
static inline enum skb_drop_reasonfib_validate_source_reason(struct sk_buff *skb, __be32 src, __be32 dst, dscp_t dscp, int oif, struct net_device *dev, struct in_device *idev, u32 *itag){ int err = fib_validate_source(skb, src, dst, dscp, oif, dev, idev, itag); if (err < 0) return -err; return SKB_NOT_DROPPED_YET;}
#ifdef CONFIG_IP_ROUTE_CLASSIDstatic inline int fib_num_tclassid_users(struct net *net){ return atomic_read(&net->ipv4.fib_num_tclassid_users);}#elsestatic inline int fib_num_tclassid_users(struct net *net){ return 0;}#endifint fib_unmerge(struct net *net);
static inline bool nhc_l3mdev_matches_dev(const struct fib_nh_common *nhc,const struct net_device *dev){ if (nhc->nhc_dev == dev || l3mdev_master_ifindex_rcu(nhc->nhc_dev) == dev->ifindex) return true;
return false;}
/* 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);
/* Fields used for sysctl_fib_multipath_hash_fields. * Common to IPv4 and IPv6. * * Add new fields at the end. This is user API. */#define FIB_MULTIPATH_HASH_FIELD_SRC_IP BIT(0)#define FIB_MULTIPATH_HASH_FIELD_DST_IP BIT(1)#define FIB_MULTIPATH_HASH_FIELD_IP_PROTO BIT(2)#define FIB_MULTIPATH_HASH_FIELD_FLOWLABEL BIT(3)#define FIB_MULTIPATH_HASH_FIELD_SRC_PORT BIT(4)#define FIB_MULTIPATH_HASH_FIELD_DST_PORT BIT(5)#define FIB_MULTIPATH_HASH_FIELD_INNER_SRC_IP BIT(6)#define FIB_MULTIPATH_HASH_FIELD_INNER_DST_IP BIT(7)#define FIB_MULTIPATH_HASH_FIELD_INNER_IP_PROTO BIT(8)#define FIB_MULTIPATH_HASH_FIELD_INNER_FLOWLABEL BIT(9)#define FIB_MULTIPATH_HASH_FIELD_INNER_SRC_PORT BIT(10)#define FIB_MULTIPATH_HASH_FIELD_INNER_DST_PORT BIT(11)
#define FIB_MULTIPATH_HASH_FIELD_OUTER_MASK \ (FIB_MULTIPATH_HASH_FIELD_SRC_IP | \ FIB_MULTIPATH_HASH_FIELD_DST_IP | \ FIB_MULTIPATH_HASH_FIELD_IP_PROTO | \ FIB_MULTIPATH_HASH_FIELD_FLOWLABEL | \ FIB_MULTIPATH_HASH_FIELD_SRC_PORT | \ FIB_MULTIPATH_HASH_FIELD_DST_PORT)
#define FIB_MULTIPATH_HASH_FIELD_INNER_MASK \ (FIB_MULTIPATH_HASH_FIELD_INNER_SRC_IP | \ FIB_MULTIPATH_HASH_FIELD_INNER_DST_IP | \ FIB_MULTIPATH_HASH_FIELD_INNER_IP_PROTO | \ FIB_MULTIPATH_HASH_FIELD_INNER_FLOWLABEL | \ FIB_MULTIPATH_HASH_FIELD_INNER_SRC_PORT | \ FIB_MULTIPATH_HASH_FIELD_INNER_DST_PORT)
#define FIB_MULTIPATH_HASH_FIELD_ALL_MASK \ (FIB_MULTIPATH_HASH_FIELD_OUTER_MASK | \ FIB_MULTIPATH_HASH_FIELD_INNER_MASK)
#define FIB_MULTIPATH_HASH_FIELD_DEFAULT_MASK \ (FIB_MULTIPATH_HASH_FIELD_SRC_IP | \ FIB_MULTIPATH_HASH_FIELD_DST_IP | \ FIB_MULTIPATH_HASH_FIELD_IP_PROTO)
#ifdef CONFIG_IP_ROUTE_MULTIPATHint fib_multipath_hash(const struct net *net, const struct flowi4 *fl4, const struct sk_buff *skb, struct flow_keys *flkeys);
static voidfib_multipath_hash_construct_key(siphash_key_t *key, u32 mp_seed){ u64 mp_seed_64 = mp_seed;
key->key[0] = (mp_seed_64 << 32) | mp_seed_64; key->key[1] = key->key[0];}
static inline u32 fib_multipath_hash_from_keys(const struct net *net, struct flow_keys *keys){ siphash_aligned_key_t hash_key; u32 mp_seed;
mp_seed = READ_ONCE(net->ipv4.sysctl_fib_multipath_hash_seed.mp_seed); fib_multipath_hash_construct_key(&hash_key, mp_seed);
return flow_hash_from_keys_seed(keys, &hash_key);}#elsestatic inline u32 fib_multipath_hash_from_keys(const struct net *net, struct flow_keys *keys){ return flow_hash_from_keys(keys);}#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, const struct flowi4 *fl4);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 net *net, 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_alias_hw_flags_set(struct net *net, const struct fib_rt_info *fri);void fib_trie_init(void);struct fib_table *fib_trie_table(u32 id, struct fib_table *alias);bool fib_lookup_good_nhc(const struct fib_nh_common *nhc, int fib_flags, const struct flowi4 *flp);
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 bool fib_info_hold_safe(struct fib_info *fi){ return refcount_inc_not_zero(&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_FSint __net_init fib_proc_init(struct net *net);void __net_exit fib_proc_exit(struct net *net);#elsestatic 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, u32 nh_tclassid);#endif /* _NET_FIB_H */