Adding upstream version 4.19.249.upstream/4.19.249upstream

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

1 files changed, 204 insertions, 0 deletions

diff --git a/include/net/fib_rules.h b/include/net/fib_rules.h
new file mode 100644
index 000000000..10886c19c
--- /dev/null
+++ b/include/net/fib_rules.h
@@ -0,0 +1,204 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __NET_FIB_RULES_H
+#define __NET_FIB_RULES_H
+
+#include <linux/types.h>
+#include <linux/slab.h>
+#include <linux/netdevice.h>
+#include <linux/fib_rules.h>
+#include <linux/refcount.h>
+#include <net/flow.h>
+#include <net/rtnetlink.h>
+#include <net/fib_notifier.h>
+
+struct fib_kuid_range {
+	kuid_t start;
+	kuid_t end;
+};
+
+struct fib_rule {
+	struct list_head	list;
+	int			iifindex;
+	int			oifindex;
+	u32			mark;
+	u32			mark_mask;
+	u32			flags;
+	u32			table;
+	u8			action;
+	u8			l3mdev;
+	u8                      proto;
+	u8			ip_proto;
+	u32			target;
+	__be64			tun_id;
+	struct fib_rule __rcu	*ctarget;
+	struct net		*fr_net;
+
+	refcount_t		refcnt;
+	u32			pref;
+	int			suppress_ifgroup;
+	int			suppress_prefixlen;
+	char			iifname[IFNAMSIZ];
+	char			oifname[IFNAMSIZ];
+	struct fib_kuid_range	uid_range;
+	struct fib_rule_port_range	sport_range;
+	struct fib_rule_port_range	dport_range;
+	struct rcu_head		rcu;
+};
+
+struct fib_lookup_arg {
+	void			*lookup_ptr;
+	const void		*lookup_data;
+	void			*result;
+	struct fib_rule		*rule;
+	u32			table;
+	int			flags;
+#define FIB_LOOKUP_NOREF		1
+#define FIB_LOOKUP_IGNORE_LINKSTATE	2
+};
+
+struct fib_rules_ops {
+	int			family;
+	struct list_head	list;
+	int			rule_size;
+	int			addr_size;
+	int			unresolved_rules;
+	int			nr_goto_rules;
+	unsigned int		fib_rules_seq;
+
+	int			(*action)(struct fib_rule *,
+					  struct flowi *, int,
+					  struct fib_lookup_arg *);
+	bool			(*suppress)(struct fib_rule *,
+					    struct fib_lookup_arg *);
+	int			(*match)(struct fib_rule *,
+					 struct flowi *, int);
+	int			(*configure)(struct fib_rule *,
+					     struct sk_buff *,
+					     struct fib_rule_hdr *,
+					     struct nlattr **,
+					     struct netlink_ext_ack *);
+	int			(*delete)(struct fib_rule *);
+	int			(*compare)(struct fib_rule *,
+					   struct fib_rule_hdr *,
+					   struct nlattr **);
+	int			(*fill)(struct fib_rule *, struct sk_buff *,
+					struct fib_rule_hdr *);
+	size_t			(*nlmsg_payload)(struct fib_rule *);
+
+	/* Called after modifications to the rules set, must flush
+	 * the route cache if one exists. */
+	void			(*flush_cache)(struct fib_rules_ops *ops);
+
+	int			nlgroup;
+	const struct nla_policy	*policy;
+	struct list_head	rules_list;
+	struct module		*owner;
+	struct net		*fro_net;
+	struct rcu_head		rcu;
+};
+
+struct fib_rule_notifier_info {
+	struct fib_notifier_info info; /* must be first */
+	struct fib_rule *rule;
+};
+
+#define FRA_GENERIC_POLICY \
+	[FRA_IIFNAME]	= { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, \
+	[FRA_OIFNAME]	= { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, \
+	[FRA_PRIORITY]	= { .type = NLA_U32 }, \
+	[FRA_FWMARK]	= { .type = NLA_U32 }, \
+	[FRA_TUN_ID]	= { .type = NLA_U64 }, \
+	[FRA_FWMASK]	= { .type = NLA_U32 }, \
+	[FRA_TABLE]     = { .type = NLA_U32 }, \
+	[FRA_SUPPRESS_PREFIXLEN] = { .type = NLA_U32 }, \
+	[FRA_SUPPRESS_IFGROUP] = { .type = NLA_U32 }, \
+	[FRA_GOTO]	= { .type = NLA_U32 }, \
+	[FRA_L3MDEV]	= { .type = NLA_U8 }, \
+	[FRA_UID_RANGE]	= { .len = sizeof(struct fib_rule_uid_range) }, \
+	[FRA_PROTOCOL]  = { .type = NLA_U8 }, \
+	[FRA_IP_PROTO]  = { .type = NLA_U8 }, \
+	[FRA_SPORT_RANGE] = { .len = sizeof(struct fib_rule_port_range) }, \
+	[FRA_DPORT_RANGE] = { .len = sizeof(struct fib_rule_port_range) }
+
+
+static inline void fib_rule_get(struct fib_rule *rule)
+{
+	refcount_inc(&rule->refcnt);
+}
+
+static inline void fib_rule_put(struct fib_rule *rule)
+{
+	if (refcount_dec_and_test(&rule->refcnt))
+		kfree_rcu(rule, rcu);
+}
+
+#ifdef CONFIG_NET_L3_MASTER_DEV
+static inline u32 fib_rule_get_table(struct fib_rule *rule,
+				     struct fib_lookup_arg *arg)
+{
+	return rule->l3mdev ? arg->table : rule->table;
+}
+#else
+static inline u32 fib_rule_get_table(struct fib_rule *rule,
+				     struct fib_lookup_arg *arg)
+{
+	return rule->table;
+}
+#endif
+
+static inline u32 frh_get_table(struct fib_rule_hdr *frh, struct nlattr **nla)
+{
+	if (nla[FRA_TABLE])
+		return nla_get_u32(nla[FRA_TABLE]);
+	return frh->table;
+}
+
+static inline bool fib_rule_port_range_set(const struct fib_rule_port_range *range)
+{
+	return range->start != 0 && range->end != 0;
+}
+
+static inline bool fib_rule_port_inrange(const struct fib_rule_port_range *a,
+					 __be16 port)
+{
+	return ntohs(port) >= a->start &&
+		ntohs(port) <= a->end;
+}
+
+static inline bool fib_rule_port_range_valid(const struct fib_rule_port_range *a)
+{
+	return a->start != 0 && a->end != 0 && a->end < 0xffff &&
+		a->start <= a->end;
+}
+
+static inline bool fib_rule_port_range_compare(struct fib_rule_port_range *a,
+					       struct fib_rule_port_range *b)
+{
+	return a->start == b->start &&
+		a->end == b->end;
+}
+
+static inline bool fib_rule_requires_fldissect(struct fib_rule *rule)
+{
+	return rule->ip_proto ||
+		fib_rule_port_range_set(&rule->sport_range) ||
+		fib_rule_port_range_set(&rule->dport_range);
+}
+
+struct fib_rules_ops *fib_rules_register(const struct fib_rules_ops *,
+					 struct net *);
+void fib_rules_unregister(struct fib_rules_ops *);
+
+int fib_rules_lookup(struct fib_rules_ops *, struct flowi *, int flags,
+		     struct fib_lookup_arg *);
+int fib_default_rule_add(struct fib_rules_ops *, u32 pref, u32 table,
+			 u32 flags);
+bool fib_rule_matchall(const struct fib_rule *rule);
+int fib_rules_dump(struct net *net, struct notifier_block *nb, int family);
+unsigned int fib_rules_seq_read(struct net *net, int family);
+
+int fib_nl_newrule(struct sk_buff *skb, struct nlmsghdr *nlh,
+		   struct netlink_ext_ack *extack);
+int fib_nl_delrule(struct sk_buff *skb, struct nlmsghdr *nlh,
+		   struct netlink_ext_ack *extack);
+#endif