1 files changed, 496 insertions, 0 deletions

diff --git a/include/linux/netfilter.h b/include/linux/netfilter.h
new file mode 100644
index 000000000..bef8db9d6
--- /dev/null
+++ b/include/linux/netfilter.h
@@ -0,0 +1,496 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __LINUX_NETFILTER_H
+#define __LINUX_NETFILTER_H
+
+#include <linux/init.h>
+#include <linux/skbuff.h>
+#include <linux/net.h>
+#include <linux/if.h>
+#include <linux/in.h>
+#include <linux/in6.h>
+#include <linux/wait.h>
+#include <linux/list.h>
+#include <linux/static_key.h>
+#include <linux/netfilter_defs.h>
+#include <linux/netdevice.h>
+#include <linux/sockptr.h>
+#include <net/net_namespace.h>
+
+static inline int NF_DROP_GETERR(int verdict)
+{
+	return -(verdict >> NF_VERDICT_QBITS);
+}
+
+static inline int nf_inet_addr_cmp(const union nf_inet_addr *a1,
+				   const union nf_inet_addr *a2)
+{
+#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
+	const unsigned long *ul1 = (const unsigned long *)a1;
+	const unsigned long *ul2 = (const unsigned long *)a2;
+
+	return ((ul1[0] ^ ul2[0]) | (ul1[1] ^ ul2[1])) == 0UL;
+#else
+	return a1->all[0] == a2->all[0] &&
+	       a1->all[1] == a2->all[1] &&
+	       a1->all[2] == a2->all[2] &&
+	       a1->all[3] == a2->all[3];
+#endif
+}
+
+static inline void nf_inet_addr_mask(const union nf_inet_addr *a1,
+				     union nf_inet_addr *result,
+				     const union nf_inet_addr *mask)
+{
+#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
+	const unsigned long *ua = (const unsigned long *)a1;
+	unsigned long *ur = (unsigned long *)result;
+	const unsigned long *um = (const unsigned long *)mask;
+
+	ur[0] = ua[0] & um[0];
+	ur[1] = ua[1] & um[1];
+#else
+	result->all[0] = a1->all[0] & mask->all[0];
+	result->all[1] = a1->all[1] & mask->all[1];
+	result->all[2] = a1->all[2] & mask->all[2];
+	result->all[3] = a1->all[3] & mask->all[3];
+#endif
+}
+
+int netfilter_init(void);
+
+struct sk_buff;
+
+struct nf_hook_ops;
+
+struct sock;
+
+struct nf_hook_state {
+	u8 hook;
+	u8 pf;
+	struct net_device *in;
+	struct net_device *out;
+	struct sock *sk;
+	struct net *net;
+	int (*okfn)(struct net *, struct sock *, struct sk_buff *);
+};
+
+typedef unsigned int nf_hookfn(void *priv,
+			       struct sk_buff *skb,
+			       const struct nf_hook_state *state);
+enum nf_hook_ops_type {
+	NF_HOOK_OP_UNDEFINED,
+	NF_HOOK_OP_NF_TABLES,
+};
+
+struct nf_hook_ops {
+	/* User fills in from here down. */
+	nf_hookfn		*hook;
+	struct net_device	*dev;
+	void			*priv;
+	u8			pf;
+	enum nf_hook_ops_type	hook_ops_type:8;
+	unsigned int		hooknum;
+	/* Hooks are ordered in ascending priority. */
+	int			priority;
+};
+
+struct nf_hook_entry {
+	nf_hookfn			*hook;
+	void				*priv;
+};
+
+struct nf_hook_entries_rcu_head {
+	struct rcu_head head;
+	void	*allocation;
+};
+
+struct nf_hook_entries {
+	u16				num_hook_entries;
+	/* padding */
+	struct nf_hook_entry		hooks[];
+
+	/* trailer: pointers to original orig_ops of each hook,
+	 * followed by rcu_head and scratch space used for freeing
+	 * the structure via call_rcu.
+	 *
+	 *   This is not part of struct nf_hook_entry since its only
+	 *   needed in slow path (hook register/unregister):
+	 * const struct nf_hook_ops     *orig_ops[]
+	 *
+	 *   For the same reason, we store this at end -- its
+	 *   only needed when a hook is deleted, not during
+	 *   packet path processing:
+	 * struct nf_hook_entries_rcu_head     head
+	 */
+};
+
+#ifdef CONFIG_NETFILTER
+static inline struct nf_hook_ops **nf_hook_entries_get_hook_ops(const struct nf_hook_entries *e)
+{
+	unsigned int n = e->num_hook_entries;
+	const void *hook_end;
+
+	hook_end = &e->hooks[n]; /* this is *past* ->hooks[]! */
+
+	return (struct nf_hook_ops **)hook_end;
+}
+
+static inline int
+nf_hook_entry_hookfn(const struct nf_hook_entry *entry, struct sk_buff *skb,
+		     struct nf_hook_state *state)
+{
+	return entry->hook(entry->priv, skb, state);
+}
+
+static inline void nf_hook_state_init(struct nf_hook_state *p,
+				      unsigned int hook,
+				      u_int8_t pf,
+				      struct net_device *indev,
+				      struct net_device *outdev,
+				      struct sock *sk,
+				      struct net *net,
+				      int (*okfn)(struct net *, struct sock *, struct sk_buff *))
+{
+	p->hook = hook;
+	p->pf = pf;
+	p->in = indev;
+	p->out = outdev;
+	p->sk = sk;
+	p->net = net;
+	p->okfn = okfn;
+}
+
+
+
+struct nf_sockopt_ops {
+	struct list_head list;
+
+	u_int8_t pf;
+
+	/* Non-inclusive ranges: use 0/0/NULL to never get called. */
+	int set_optmin;
+	int set_optmax;
+	int (*set)(struct sock *sk, int optval, sockptr_t arg,
+		   unsigned int len);
+	int get_optmin;
+	int get_optmax;
+	int (*get)(struct sock *sk, int optval, void __user *user, int *len);
+	/* Use the module struct to lock set/get code in place */
+	struct module *owner;
+};
+
+/* Function to register/unregister hook points. */
+int nf_register_net_hook(struct net *net, const struct nf_hook_ops *ops);
+void nf_unregister_net_hook(struct net *net, const struct nf_hook_ops *ops);
+int nf_register_net_hooks(struct net *net, const struct nf_hook_ops *reg,
+			  unsigned int n);
+void nf_unregister_net_hooks(struct net *net, const struct nf_hook_ops *reg,
+			     unsigned int n);
+
+/* Functions to register get/setsockopt ranges (non-inclusive).  You
+   need to check permissions yourself! */
+int nf_register_sockopt(struct nf_sockopt_ops *reg);
+void nf_unregister_sockopt(struct nf_sockopt_ops *reg);
+
+#ifdef CONFIG_JUMP_LABEL
+extern struct static_key nf_hooks_needed[NFPROTO_NUMPROTO][NF_MAX_HOOKS];
+#endif
+
+int nf_hook_slow(struct sk_buff *skb, struct nf_hook_state *state,
+		 const struct nf_hook_entries *e, unsigned int i);
+
+void nf_hook_slow_list(struct list_head *head, struct nf_hook_state *state,
+		       const struct nf_hook_entries *e);
+/**
+ *	nf_hook - call a netfilter hook
+ *
+ *	Returns 1 if the hook has allowed the packet to pass.  The function
+ *	okfn must be invoked by the caller in this case.  Any other return
+ *	value indicates the packet has been consumed by the hook.
+ */
+static inline int nf_hook(u_int8_t pf, unsigned int hook, struct net *net,
+			  struct sock *sk, struct sk_buff *skb,
+			  struct net_device *indev, struct net_device *outdev,
+			  int (*okfn)(struct net *, struct sock *, struct sk_buff *))
+{
+	struct nf_hook_entries *hook_head = NULL;
+	int ret = 1;
+
+#ifdef CONFIG_JUMP_LABEL
+	if (__builtin_constant_p(pf) &&
+	    __builtin_constant_p(hook) &&
+	    !static_key_false(&nf_hooks_needed[pf][hook]))
+		return 1;
+#endif
+
+	rcu_read_lock();
+	switch (pf) {
+	case NFPROTO_IPV4:
+		hook_head = rcu_dereference(net->nf.hooks_ipv4[hook]);
+		break;
+	case NFPROTO_IPV6:
+		hook_head = rcu_dereference(net->nf.hooks_ipv6[hook]);
+		break;
+	case NFPROTO_ARP:
+#ifdef CONFIG_NETFILTER_FAMILY_ARP
+		if (WARN_ON_ONCE(hook >= ARRAY_SIZE(net->nf.hooks_arp)))
+			break;
+		hook_head = rcu_dereference(net->nf.hooks_arp[hook]);
+#endif
+		break;
+	case NFPROTO_BRIDGE:
+#ifdef CONFIG_NETFILTER_FAMILY_BRIDGE
+		hook_head = rcu_dereference(net->nf.hooks_bridge[hook]);
+#endif
+		break;
+	default:
+		WARN_ON_ONCE(1);
+		break;
+	}
+
+	if (hook_head) {
+		struct nf_hook_state state;
+
+		nf_hook_state_init(&state, hook, pf, indev, outdev,
+				   sk, net, okfn);
+
+		ret = nf_hook_slow(skb, &state, hook_head, 0);
+	}
+	rcu_read_unlock();
+
+	return ret;
+}
+
+/* Activate hook; either okfn or kfree_skb called, unless a hook
+   returns NF_STOLEN (in which case, it's up to the hook to deal with
+   the consequences).
+
+   Returns -ERRNO if packet dropped.  Zero means queued, stolen or
+   accepted.
+*/
+
+/* RR:
+   > I don't want nf_hook to return anything because people might forget
+   > about async and trust the return value to mean "packet was ok".
+
+   AK:
+   Just document it clearly, then you can expect some sense from kernel
+   coders :)
+*/
+
+static inline int
+NF_HOOK_COND(uint8_t pf, unsigned int hook, struct net *net, struct sock *sk,
+	     struct sk_buff *skb, struct net_device *in, struct net_device *out,
+	     int (*okfn)(struct net *, struct sock *, struct sk_buff *),
+	     bool cond)
+{
+	int ret;
+
+	if (!cond ||
+	    ((ret = nf_hook(pf, hook, net, sk, skb, in, out, okfn)) == 1))
+		ret = okfn(net, sk, skb);
+	return ret;
+}
+
+static inline int
+NF_HOOK(uint8_t pf, unsigned int hook, struct net *net, struct sock *sk, struct sk_buff *skb,
+	struct net_device *in, struct net_device *out,
+	int (*okfn)(struct net *, struct sock *, struct sk_buff *))
+{
+	int ret = nf_hook(pf, hook, net, sk, skb, in, out, okfn);
+	if (ret == 1)
+		ret = okfn(net, sk, skb);
+	return ret;
+}
+
+static inline void
+NF_HOOK_LIST(uint8_t pf, unsigned int hook, struct net *net, struct sock *sk,
+	     struct list_head *head, struct net_device *in, struct net_device *out,
+	     int (*okfn)(struct net *, struct sock *, struct sk_buff *))
+{
+	struct nf_hook_entries *hook_head = NULL;
+
+#ifdef CONFIG_JUMP_LABEL
+	if (__builtin_constant_p(pf) &&
+	    __builtin_constant_p(hook) &&
+	    !static_key_false(&nf_hooks_needed[pf][hook]))
+		return;
+#endif
+
+	rcu_read_lock();
+	switch (pf) {
+	case NFPROTO_IPV4:
+		hook_head = rcu_dereference(net->nf.hooks_ipv4[hook]);
+		break;
+	case NFPROTO_IPV6:
+		hook_head = rcu_dereference(net->nf.hooks_ipv6[hook]);
+		break;
+	default:
+		WARN_ON_ONCE(1);
+		break;
+	}
+
+	if (hook_head) {
+		struct nf_hook_state state;
+
+		nf_hook_state_init(&state, hook, pf, in, out, sk, net, okfn);
+
+		nf_hook_slow_list(head, &state, hook_head);
+	}
+	rcu_read_unlock();
+}
+
+/* Call setsockopt() */
+int nf_setsockopt(struct sock *sk, u_int8_t pf, int optval, sockptr_t opt,
+		  unsigned int len);
+int nf_getsockopt(struct sock *sk, u_int8_t pf, int optval, char __user *opt,
+		  int *len);
+
+struct flowi;
+struct nf_queue_entry;
+
+__sum16 nf_checksum(struct sk_buff *skb, unsigned int hook,
+		    unsigned int dataoff, u_int8_t protocol,
+		    unsigned short family);
+
+__sum16 nf_checksum_partial(struct sk_buff *skb, unsigned int hook,
+			    unsigned int dataoff, unsigned int len,
+			    u_int8_t protocol, unsigned short family);
+int nf_route(struct net *net, struct dst_entry **dst, struct flowi *fl,
+	     bool strict, unsigned short family);
+int nf_reroute(struct sk_buff *skb, struct nf_queue_entry *entry);
+
+#include <net/flow.h>
+
+struct nf_conn;
+enum nf_nat_manip_type;
+struct nlattr;
+enum ip_conntrack_dir;
+
+struct nf_nat_hook {
+	int (*parse_nat_setup)(struct nf_conn *ct, enum nf_nat_manip_type manip,
+			       const struct nlattr *attr);
+	void (*decode_session)(struct sk_buff *skb, struct flowi *fl);
+	unsigned int (*manip_pkt)(struct sk_buff *skb, struct nf_conn *ct,
+				  enum nf_nat_manip_type mtype,
+				  enum ip_conntrack_dir dir);
+	void (*remove_nat_bysrc)(struct nf_conn *ct);
+};
+
+extern const struct nf_nat_hook __rcu *nf_nat_hook;
+
+static inline void
+nf_nat_decode_session(struct sk_buff *skb, struct flowi *fl, u_int8_t family)
+{
+#if IS_ENABLED(CONFIG_NF_NAT)
+	const struct nf_nat_hook *nat_hook;
+
+	rcu_read_lock();
+	nat_hook = rcu_dereference(nf_nat_hook);
+	if (nat_hook && nat_hook->decode_session)
+		nat_hook->decode_session(skb, fl);
+	rcu_read_unlock();
+#endif
+}
+
+#else /* !CONFIG_NETFILTER */
+static inline int
+NF_HOOK_COND(uint8_t pf, unsigned int hook, struct net *net, struct sock *sk,
+	     struct sk_buff *skb, struct net_device *in, struct net_device *out,
+	     int (*okfn)(struct net *, struct sock *, struct sk_buff *),
+	     bool cond)
+{
+	return okfn(net, sk, skb);
+}
+
+static inline int
+NF_HOOK(uint8_t pf, unsigned int hook, struct net *net, struct sock *sk,
+	struct sk_buff *skb, struct net_device *in, struct net_device *out,
+	int (*okfn)(struct net *, struct sock *, struct sk_buff *))
+{
+	return okfn(net, sk, skb);
+}
+
+static inline void
+NF_HOOK_LIST(uint8_t pf, unsigned int hook, struct net *net, struct sock *sk,
+	     struct list_head *head, struct net_device *in, struct net_device *out,
+	     int (*okfn)(struct net *, struct sock *, struct sk_buff *))
+{
+	/* nothing to do */
+}
+
+static inline int nf_hook(u_int8_t pf, unsigned int hook, struct net *net,
+			  struct sock *sk, struct sk_buff *skb,
+			  struct net_device *indev, struct net_device *outdev,
+			  int (*okfn)(struct net *, struct sock *, struct sk_buff *))
+{
+	return 1;
+}
+struct flowi;
+static inline void
+nf_nat_decode_session(struct sk_buff *skb, struct flowi *fl, u_int8_t family)
+{
+}
+#endif /*CONFIG_NETFILTER*/
+
+#if IS_ENABLED(CONFIG_NF_CONNTRACK)
+#include <linux/netfilter/nf_conntrack_zones_common.h>
+
+void nf_ct_attach(struct sk_buff *, const struct sk_buff *);
+struct nf_conntrack_tuple;
+bool nf_ct_get_tuple_skb(struct nf_conntrack_tuple *dst_tuple,
+			 const struct sk_buff *skb);
+#else
+static inline void nf_ct_attach(struct sk_buff *new, struct sk_buff *skb) {}
+struct nf_conntrack_tuple;
+static inline bool nf_ct_get_tuple_skb(struct nf_conntrack_tuple *dst_tuple,
+				       const struct sk_buff *skb)
+{
+	return false;
+}
+#endif
+
+struct nf_conn;
+enum ip_conntrack_info;
+
+struct nf_ct_hook {
+	int (*update)(struct net *net, struct sk_buff *skb);
+	void (*destroy)(struct nf_conntrack *);
+	bool (*get_tuple_skb)(struct nf_conntrack_tuple *,
+			      const struct sk_buff *);
+	void (*attach)(struct sk_buff *nskb, const struct sk_buff *skb);
+};
+extern const struct nf_ct_hook __rcu *nf_ct_hook;
+
+struct nlattr;
+
+struct nfnl_ct_hook {
+	size_t (*build_size)(const struct nf_conn *ct);
+	int (*build)(struct sk_buff *skb, struct nf_conn *ct,
+		     enum ip_conntrack_info ctinfo,
+		     u_int16_t ct_attr, u_int16_t ct_info_attr);
+	int (*parse)(const struct nlattr *attr, struct nf_conn *ct);
+	int (*attach_expect)(const struct nlattr *attr, struct nf_conn *ct,
+			     u32 portid, u32 report);
+	void (*seq_adjust)(struct sk_buff *skb, struct nf_conn *ct,
+			   enum ip_conntrack_info ctinfo, s32 off);
+};
+extern const struct nfnl_ct_hook __rcu *nfnl_ct_hook;
+
+/**
+ * nf_skb_duplicated - TEE target has sent a packet
+ *
+ * When a xtables target sends a packet, the OUTPUT and POSTROUTING
+ * hooks are traversed again, i.e. nft and xtables are invoked recursively.
+ *
+ * This is used by xtables TEE target to prevent the duplicated skb from
+ * being duplicated again.
+ */
+DECLARE_PER_CPU(bool, nf_skb_duplicated);
+
+/**
+ * Contains bitmask of ctnetlink event subscribers, if any.
+ * Can't be pernet due to NETLINK_LISTEN_ALL_NSID setsockopt flag.
+ */
+extern u8 nf_ctnetlink_has_listener;
+#endif /*__LINUX_NETFILTER_H*/