Adding upstream version 5.10.209.upstream/5.10.209

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 558 insertions, 0 deletions

diff --git a/include/net/ip_fib.h b/include/net/ip_fib.h
new file mode 100644
index 000000000..0d3cb34c7
--- /dev/null
+++ b/include/net/ip_fib.h
@@ -0,0 +1,558 @@
+/* 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;
+	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;
+	u8			tos;
+	u8			type;
+	u8			offload:1,
+				trap:1,
+				unused:6;
+};
+
+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[];
+};
+
+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;
+
+	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 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);
+
+#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 */