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-rw-r--r--include/net/ip_fib.h608
1 files changed, 608 insertions, 0 deletions
diff --git a/include/net/ip_fib.h b/include/net/ip_fib.h
new file mode 100644
index 000000000..15de07d36
--- /dev/null
+++ b/include/net/ip_fib.h
@@ -0,0 +1,608 @@
+/* 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/inet_dscp.h>
+#include <net/inetpeer.h>
+#include <linux/percpu.h>
+#include <linux/notifier.h>
+#include <linux/refcount.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[];
+};
+
+
+#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_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(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;
+
+ 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 */
+
+/* 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 atomic_read(&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);
+
+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_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 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 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, u32 nh_tclassid);
+#endif /* _NET_FIB_H */
generated by cgit v1.2.3 (git 2.39.1) at 2024-05-19 22:34:51 +0000