Adding upstream version 5.10.209.upstream/5.10.209upstream

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

1 files changed, 656 insertions, 0 deletions

diff --git a/include/net/ip6_fib.h b/include/net/ip6_fib.h
new file mode 100644
index 000000000..95d93ecf0
--- /dev/null
+++ b/include/net/ip6_fib.h
@@ -0,0 +1,656 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ *	Linux INET6 implementation 
+ *
+ *	Authors:
+ *	Pedro Roque		<roque@di.fc.ul.pt>	
+ */
+
+#ifndef _IP6_FIB_H
+#define _IP6_FIB_H
+
+#include <linux/ipv6_route.h>
+#include <linux/rtnetlink.h>
+#include <linux/spinlock.h>
+#include <linux/notifier.h>
+#include <net/dst.h>
+#include <net/flow.h>
+#include <net/ip_fib.h>
+#include <net/netlink.h>
+#include <net/inetpeer.h>
+#include <net/fib_notifier.h>
+#include <linux/indirect_call_wrapper.h>
+
+#ifdef CONFIG_IPV6_MULTIPLE_TABLES
+#define FIB6_TABLE_HASHSZ 256
+#else
+#define FIB6_TABLE_HASHSZ 1
+#endif
+
+#define RT6_DEBUG 2
+
+#if RT6_DEBUG >= 3
+#define RT6_TRACE(x...) pr_debug(x)
+#else
+#define RT6_TRACE(x...) do { ; } while (0)
+#endif
+
+struct rt6_info;
+struct fib6_info;
+
+struct fib6_config {
+	u32		fc_table;
+	u32		fc_metric;
+	int		fc_dst_len;
+	int		fc_src_len;
+	int		fc_ifindex;
+	u32		fc_flags;
+	u32		fc_protocol;
+	u16		fc_type;        /* only 8 bits are used */
+	u16		fc_delete_all_nh : 1,
+			fc_ignore_dev_down:1,
+			__unused : 14;
+	u32		fc_nh_id;
+
+	struct in6_addr	fc_dst;
+	struct in6_addr	fc_src;
+	struct in6_addr	fc_prefsrc;
+	struct in6_addr	fc_gateway;
+
+	unsigned long	fc_expires;
+	struct nlattr	*fc_mx;
+	int		fc_mx_len;
+	int		fc_mp_len;
+	struct nlattr	*fc_mp;
+
+	struct nl_info	fc_nlinfo;
+	struct nlattr	*fc_encap;
+	u16		fc_encap_type;
+	bool		fc_is_fdb;
+};
+
+struct fib6_node {
+	struct fib6_node __rcu	*parent;
+	struct fib6_node __rcu	*left;
+	struct fib6_node __rcu	*right;
+#ifdef CONFIG_IPV6_SUBTREES
+	struct fib6_node __rcu	*subtree;
+#endif
+	struct fib6_info __rcu	*leaf;
+
+	__u16			fn_bit;		/* bit key */
+	__u16			fn_flags;
+	int			fn_sernum;
+	struct fib6_info __rcu	*rr_ptr;
+	struct rcu_head		rcu;
+};
+
+struct fib6_gc_args {
+	int			timeout;
+	int			more;
+};
+
+#ifndef CONFIG_IPV6_SUBTREES
+#define FIB6_SUBTREE(fn)	NULL
+
+static inline bool fib6_routes_require_src(const struct net *net)
+{
+	return false;
+}
+
+static inline void fib6_routes_require_src_inc(struct net *net) {}
+static inline void fib6_routes_require_src_dec(struct net *net) {}
+
+#else
+
+static inline bool fib6_routes_require_src(const struct net *net)
+{
+	return net->ipv6.fib6_routes_require_src > 0;
+}
+
+static inline void fib6_routes_require_src_inc(struct net *net)
+{
+	net->ipv6.fib6_routes_require_src++;
+}
+
+static inline void fib6_routes_require_src_dec(struct net *net)
+{
+	net->ipv6.fib6_routes_require_src--;
+}
+
+#define FIB6_SUBTREE(fn)	(rcu_dereference_protected((fn)->subtree, 1))
+#endif
+
+/*
+ *	routing information
+ *
+ */
+
+struct rt6key {
+	struct in6_addr	addr;
+	int		plen;
+};
+
+struct fib6_table;
+
+struct rt6_exception_bucket {
+	struct hlist_head	chain;
+	int			depth;
+};
+
+struct rt6_exception {
+	struct hlist_node	hlist;
+	struct rt6_info		*rt6i;
+	unsigned long		stamp;
+	struct rcu_head		rcu;
+};
+
+#define FIB6_EXCEPTION_BUCKET_SIZE_SHIFT 10
+#define FIB6_EXCEPTION_BUCKET_SIZE (1 << FIB6_EXCEPTION_BUCKET_SIZE_SHIFT)
+#define FIB6_MAX_DEPTH 5
+
+struct fib6_nh {
+	struct fib_nh_common	nh_common;
+
+#ifdef CONFIG_IPV6_ROUTER_PREF
+	unsigned long		last_probe;
+#endif
+
+	struct rt6_info * __percpu *rt6i_pcpu;
+	struct rt6_exception_bucket __rcu *rt6i_exception_bucket;
+};
+
+struct fib6_info {
+	struct fib6_table		*fib6_table;
+	struct fib6_info __rcu		*fib6_next;
+	struct fib6_node __rcu		*fib6_node;
+
+	/* Multipath routes:
+	 * siblings is a list of fib6_info that have the same metric/weight,
+	 * destination, but not the same gateway. nsiblings is just a cache
+	 * to speed up lookup.
+	 */
+	union {
+		struct list_head	fib6_siblings;
+		struct list_head	nh_list;
+	};
+	unsigned int			fib6_nsiblings;
+
+	refcount_t			fib6_ref;
+	unsigned long			expires;
+	struct dst_metrics		*fib6_metrics;
+#define fib6_pmtu		fib6_metrics->metrics[RTAX_MTU-1]
+
+	struct rt6key			fib6_dst;
+	u32				fib6_flags;
+	struct rt6key			fib6_src;
+	struct rt6key			fib6_prefsrc;
+
+	u32				fib6_metric;
+	u8				fib6_protocol;
+	u8				fib6_type;
+	u8				should_flush:1,
+					dst_nocount:1,
+					dst_nopolicy:1,
+					fib6_destroying:1,
+					offload:1,
+					trap:1,
+					unused:2;
+
+	struct rcu_head			rcu;
+	struct nexthop			*nh;
+	struct fib6_nh			fib6_nh[];
+};
+
+struct rt6_info {
+	struct dst_entry		dst;
+	struct fib6_info __rcu		*from;
+	int				sernum;
+
+	struct rt6key			rt6i_dst;
+	struct rt6key			rt6i_src;
+	struct in6_addr			rt6i_gateway;
+	struct inet6_dev		*rt6i_idev;
+	u32				rt6i_flags;
+
+	struct list_head		rt6i_uncached;
+	struct uncached_list		*rt6i_uncached_list;
+
+	/* more non-fragment space at head required */
+	unsigned short			rt6i_nfheader_len;
+};
+
+struct fib6_result {
+	struct fib6_nh		*nh;
+	struct fib6_info	*f6i;
+	u32			fib6_flags;
+	u8			fib6_type;
+	struct rt6_info		*rt6;
+};
+
+#define for_each_fib6_node_rt_rcu(fn)					\
+	for (rt = rcu_dereference((fn)->leaf); rt;			\
+	     rt = rcu_dereference(rt->fib6_next))
+
+#define for_each_fib6_walker_rt(w)					\
+	for (rt = (w)->leaf; rt;					\
+	     rt = rcu_dereference_protected(rt->fib6_next, 1))
+
+static inline struct inet6_dev *ip6_dst_idev(struct dst_entry *dst)
+{
+	return ((struct rt6_info *)dst)->rt6i_idev;
+}
+
+static inline bool fib6_requires_src(const struct fib6_info *rt)
+{
+	return rt->fib6_src.plen > 0;
+}
+
+static inline void fib6_clean_expires(struct fib6_info *f6i)
+{
+	f6i->fib6_flags &= ~RTF_EXPIRES;
+	f6i->expires = 0;
+}
+
+static inline void fib6_set_expires(struct fib6_info *f6i,
+				    unsigned long expires)
+{
+	f6i->expires = expires;
+	f6i->fib6_flags |= RTF_EXPIRES;
+}
+
+static inline bool fib6_check_expired(const struct fib6_info *f6i)
+{
+	if (f6i->fib6_flags & RTF_EXPIRES)
+		return time_after(jiffies, f6i->expires);
+	return false;
+}
+
+/* Function to safely get fn->sernum for passed in rt
+ * and store result in passed in cookie.
+ * Return true if we can get cookie safely
+ * Return false if not
+ */
+static inline bool fib6_get_cookie_safe(const struct fib6_info *f6i,
+					u32 *cookie)
+{
+	struct fib6_node *fn;
+	bool status = false;
+
+	fn = rcu_dereference(f6i->fib6_node);
+
+	if (fn) {
+		*cookie = READ_ONCE(fn->fn_sernum);
+		/* pairs with smp_wmb() in fib6_update_sernum_upto_root() */
+		smp_rmb();
+		status = true;
+	}
+
+	return status;
+}
+
+static inline u32 rt6_get_cookie(const struct rt6_info *rt)
+{
+	struct fib6_info *from;
+	u32 cookie = 0;
+
+	if (rt->sernum)
+		return rt->sernum;
+
+	rcu_read_lock();
+
+	from = rcu_dereference(rt->from);
+	if (from)
+		fib6_get_cookie_safe(from, &cookie);
+
+	rcu_read_unlock();
+
+	return cookie;
+}
+
+static inline void ip6_rt_put(struct rt6_info *rt)
+{
+	/* dst_release() accepts a NULL parameter.
+	 * We rely on dst being first structure in struct rt6_info
+	 */
+	BUILD_BUG_ON(offsetof(struct rt6_info, dst) != 0);
+	dst_release(&rt->dst);
+}
+
+struct fib6_info *fib6_info_alloc(gfp_t gfp_flags, bool with_fib6_nh);
+void fib6_info_destroy_rcu(struct rcu_head *head);
+
+static inline void fib6_info_hold(struct fib6_info *f6i)
+{
+	refcount_inc(&f6i->fib6_ref);
+}
+
+static inline bool fib6_info_hold_safe(struct fib6_info *f6i)
+{
+	return refcount_inc_not_zero(&f6i->fib6_ref);
+}
+
+static inline void fib6_info_release(struct fib6_info *f6i)
+{
+	if (f6i && refcount_dec_and_test(&f6i->fib6_ref))
+		call_rcu(&f6i->rcu, fib6_info_destroy_rcu);
+}
+
+static inline void fib6_info_hw_flags_set(struct fib6_info *f6i, bool offload,
+					  bool trap)
+{
+	f6i->offload = offload;
+	f6i->trap = trap;
+}
+
+enum fib6_walk_state {
+#ifdef CONFIG_IPV6_SUBTREES
+	FWS_S,
+#endif
+	FWS_L,
+	FWS_R,
+	FWS_C,
+	FWS_U
+};
+
+struct fib6_walker {
+	struct list_head lh;
+	struct fib6_node *root, *node;
+	struct fib6_info *leaf;
+	enum fib6_walk_state state;
+	unsigned int skip;
+	unsigned int count;
+	unsigned int skip_in_node;
+	int (*func)(struct fib6_walker *);
+	void *args;
+};
+
+struct rt6_statistics {
+	__u32		fib_nodes;		/* all fib6 nodes */
+	__u32		fib_route_nodes;	/* intermediate nodes */
+	__u32		fib_rt_entries;		/* rt entries in fib table */
+	__u32		fib_rt_cache;		/* cached rt entries in exception table */
+	__u32		fib_discarded_routes;	/* total number of routes delete */
+
+	/* The following stats are not protected by any lock */
+	atomic_t	fib_rt_alloc;		/* total number of routes alloced */
+	atomic_t	fib_rt_uncache;		/* rt entries in uncached list */
+};
+
+#define RTN_TL_ROOT	0x0001
+#define RTN_ROOT	0x0002		/* tree root node		*/
+#define RTN_RTINFO	0x0004		/* node with valid routing info	*/
+
+/*
+ *	priority levels (or metrics)
+ *
+ */
+
+
+struct fib6_table {
+	struct hlist_node	tb6_hlist;
+	u32			tb6_id;
+	spinlock_t		tb6_lock;
+	struct fib6_node	tb6_root;
+	struct inet_peer_base	tb6_peers;
+	unsigned int		flags;
+	unsigned int		fib_seq;
+#define RT6_TABLE_HAS_DFLT_ROUTER	BIT(0)
+};
+
+#define RT6_TABLE_UNSPEC	RT_TABLE_UNSPEC
+#define RT6_TABLE_MAIN		RT_TABLE_MAIN
+#define RT6_TABLE_DFLT		RT6_TABLE_MAIN
+#define RT6_TABLE_INFO		RT6_TABLE_MAIN
+#define RT6_TABLE_PREFIX	RT6_TABLE_MAIN
+
+#ifdef CONFIG_IPV6_MULTIPLE_TABLES
+#define FIB6_TABLE_MIN		1
+#define FIB6_TABLE_MAX		RT_TABLE_MAX
+#define RT6_TABLE_LOCAL		RT_TABLE_LOCAL
+#else
+#define FIB6_TABLE_MIN		RT_TABLE_MAIN
+#define FIB6_TABLE_MAX		FIB6_TABLE_MIN
+#define RT6_TABLE_LOCAL		RT6_TABLE_MAIN
+#endif
+
+typedef struct rt6_info *(*pol_lookup_t)(struct net *,
+					 struct fib6_table *,
+					 struct flowi6 *,
+					 const struct sk_buff *, int);
+
+struct fib6_entry_notifier_info {
+	struct fib_notifier_info info; /* must be first */
+	struct fib6_info *rt;
+	unsigned int nsiblings;
+};
+
+/*
+ *	exported functions
+ */
+
+struct fib6_table *fib6_get_table(struct net *net, u32 id);
+struct fib6_table *fib6_new_table(struct net *net, u32 id);
+struct dst_entry *fib6_rule_lookup(struct net *net, struct flowi6 *fl6,
+				   const struct sk_buff *skb,
+				   int flags, pol_lookup_t lookup);
+
+/* called with rcu lock held; can return error pointer
+ * caller needs to select path
+ */
+int fib6_lookup(struct net *net, int oif, struct flowi6 *fl6,
+		struct fib6_result *res, int flags);
+
+/* called with rcu lock held; caller needs to select path */
+int fib6_table_lookup(struct net *net, struct fib6_table *table,
+		      int oif, struct flowi6 *fl6, struct fib6_result *res,
+		      int strict);
+
+void fib6_select_path(const struct net *net, struct fib6_result *res,
+		      struct flowi6 *fl6, int oif, bool have_oif_match,
+		      const struct sk_buff *skb, int strict);
+struct fib6_node *fib6_node_lookup(struct fib6_node *root,
+				   const struct in6_addr *daddr,
+				   const struct in6_addr *saddr);
+
+struct fib6_node *fib6_locate(struct fib6_node *root,
+			      const struct in6_addr *daddr, int dst_len,
+			      const struct in6_addr *saddr, int src_len,
+			      bool exact_match);
+
+void fib6_clean_all(struct net *net, int (*func)(struct fib6_info *, void *arg),
+		    void *arg);
+void fib6_clean_all_skip_notify(struct net *net,
+				int (*func)(struct fib6_info *, void *arg),
+				void *arg);
+
+int fib6_add(struct fib6_node *root, struct fib6_info *rt,
+	     struct nl_info *info, struct netlink_ext_ack *extack);
+int fib6_del(struct fib6_info *rt, struct nl_info *info);
+
+static inline
+void rt6_get_prefsrc(const struct rt6_info *rt, struct in6_addr *addr)
+{
+	const struct fib6_info *from;
+
+	rcu_read_lock();
+
+	from = rcu_dereference(rt->from);
+	if (from) {
+		*addr = from->fib6_prefsrc.addr;
+	} else {
+		struct in6_addr in6_zero = {};
+
+		*addr = in6_zero;
+	}
+
+	rcu_read_unlock();
+}
+
+int fib6_nh_init(struct net *net, struct fib6_nh *fib6_nh,
+		 struct fib6_config *cfg, gfp_t gfp_flags,
+		 struct netlink_ext_ack *extack);
+void fib6_nh_release(struct fib6_nh *fib6_nh);
+void fib6_nh_release_dsts(struct fib6_nh *fib6_nh);
+
+int call_fib6_entry_notifiers(struct net *net,
+			      enum fib_event_type event_type,
+			      struct fib6_info *rt,
+			      struct netlink_ext_ack *extack);
+int call_fib6_multipath_entry_notifiers(struct net *net,
+					enum fib_event_type event_type,
+					struct fib6_info *rt,
+					unsigned int nsiblings,
+					struct netlink_ext_ack *extack);
+int call_fib6_entry_notifiers_replace(struct net *net, struct fib6_info *rt);
+void fib6_rt_update(struct net *net, struct fib6_info *rt,
+		    struct nl_info *info);
+void inet6_rt_notify(int event, struct fib6_info *rt, struct nl_info *info,
+		     unsigned int flags);
+
+void fib6_run_gc(unsigned long expires, struct net *net, bool force);
+
+void fib6_gc_cleanup(void);
+
+int fib6_init(void);
+
+struct ipv6_route_iter {
+	struct seq_net_private p;
+	struct fib6_walker w;
+	loff_t skip;
+	struct fib6_table *tbl;
+	int sernum;
+};
+
+extern const struct seq_operations ipv6_route_seq_ops;
+
+int call_fib6_notifier(struct notifier_block *nb,
+		       enum fib_event_type event_type,
+		       struct fib_notifier_info *info);
+int call_fib6_notifiers(struct net *net, enum fib_event_type event_type,
+			struct fib_notifier_info *info);
+
+int __net_init fib6_notifier_init(struct net *net);
+void __net_exit fib6_notifier_exit(struct net *net);
+
+unsigned int fib6_tables_seq_read(struct net *net);
+int fib6_tables_dump(struct net *net, struct notifier_block *nb,
+		     struct netlink_ext_ack *extack);
+
+void fib6_update_sernum(struct net *net, struct fib6_info *rt);
+void fib6_update_sernum_upto_root(struct net *net, struct fib6_info *rt);
+void fib6_update_sernum_stub(struct net *net, struct fib6_info *f6i);
+
+void fib6_metric_set(struct fib6_info *f6i, int metric, u32 val);
+static inline bool fib6_metric_locked(struct fib6_info *f6i, int metric)
+{
+	return !!(f6i->fib6_metrics->metrics[RTAX_LOCK - 1] & (1 << metric));
+}
+
+#if IS_BUILTIN(CONFIG_IPV6) && defined(CONFIG_BPF_SYSCALL)
+struct bpf_iter__ipv6_route {
+	__bpf_md_ptr(struct bpf_iter_meta *, meta);
+	__bpf_md_ptr(struct fib6_info *, rt);
+};
+#endif
+
+INDIRECT_CALLABLE_DECLARE(struct rt6_info *ip6_pol_route_output(struct net *net,
+					     struct fib6_table *table,
+					     struct flowi6 *fl6,
+					     const struct sk_buff *skb,
+					     int flags));
+INDIRECT_CALLABLE_DECLARE(struct rt6_info *ip6_pol_route_input(struct net *net,
+					     struct fib6_table *table,
+					     struct flowi6 *fl6,
+					     const struct sk_buff *skb,
+					     int flags));
+INDIRECT_CALLABLE_DECLARE(struct rt6_info *__ip6_route_redirect(struct net *net,
+					     struct fib6_table *table,
+					     struct flowi6 *fl6,
+					     const struct sk_buff *skb,
+					     int flags));
+INDIRECT_CALLABLE_DECLARE(struct rt6_info *ip6_pol_route_lookup(struct net *net,
+					     struct fib6_table *table,
+					     struct flowi6 *fl6,
+					     const struct sk_buff *skb,
+					     int flags));
+static inline struct rt6_info *pol_lookup_func(pol_lookup_t lookup,
+						struct net *net,
+						struct fib6_table *table,
+						struct flowi6 *fl6,
+						const struct sk_buff *skb,
+						int flags)
+{
+	return INDIRECT_CALL_4(lookup,
+			       ip6_pol_route_output,
+			       ip6_pol_route_input,
+			       ip6_pol_route_lookup,
+			       __ip6_route_redirect,
+			       net, table, fl6, skb, flags);
+}
+
+#ifdef CONFIG_IPV6_MULTIPLE_TABLES
+static inline bool fib6_has_custom_rules(const struct net *net)
+{
+	return net->ipv6.fib6_has_custom_rules;
+}
+
+int fib6_rules_init(void);
+void fib6_rules_cleanup(void);
+bool fib6_rule_default(const struct fib_rule *rule);
+int fib6_rules_dump(struct net *net, struct notifier_block *nb,
+		    struct netlink_ext_ack *extack);
+unsigned int fib6_rules_seq_read(struct net *net);
+
+static inline bool fib6_rules_early_flow_dissect(struct net *net,
+						 struct sk_buff *skb,
+						 struct flowi6 *fl6,
+						 struct flow_keys *flkeys)
+{
+	unsigned int flag = FLOW_DISSECTOR_F_STOP_AT_ENCAP;
+
+	if (!net->ipv6.fib6_rules_require_fldissect)
+		return false;
+
+	skb_flow_dissect_flow_keys(skb, flkeys, flag);
+	fl6->fl6_sport = flkeys->ports.src;
+	fl6->fl6_dport = flkeys->ports.dst;
+	fl6->flowi6_proto = flkeys->basic.ip_proto;
+
+	return true;
+}
+#else
+static inline bool fib6_has_custom_rules(const struct net *net)
+{
+	return false;
+}
+static inline int               fib6_rules_init(void)
+{
+	return 0;
+}
+static inline void              fib6_rules_cleanup(void)
+{
+	return ;
+}
+static inline bool fib6_rule_default(const struct fib_rule *rule)
+{
+	return true;
+}
+static inline int fib6_rules_dump(struct net *net, struct notifier_block *nb,
+				  struct netlink_ext_ack *extack)
+{
+	return 0;
+}
+static inline unsigned int fib6_rules_seq_read(struct net *net)
+{
+	return 0;
+}
+static inline bool fib6_rules_early_flow_dissect(struct net *net,
+						 struct sk_buff *skb,
+						 struct flowi6 *fl6,
+						 struct flow_keys *flkeys)
+{
+	return false;
+}
+#endif
+#endif