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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c

 kernel/include/linux/netfilter.h
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@@ -13,9 +13,10 @@
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 #include <linux/static_key.h>
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 #include <linux/netfilter_defs.h>
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 #include <linux/netdevice.h>
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+#include <linux/sockptr.h>
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+#include <linux/android_kabi.h>
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 #include <net/net_namespace.h>
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19
 
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-#ifdef CONFIG_NETFILTER
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 static inline int NF_DROP_GETERR(int verdict)
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 {
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 	return -(verdict >> NF_VERDICT_QBITS);
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@@ -24,20 +25,36 @@
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 static inline int nf_inet_addr_cmp(const union nf_inet_addr *a1,
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 				   const union nf_inet_addr *a2)
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 {
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+#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
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+	const unsigned long *ul1 = (const unsigned long *)a1;
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+	const unsigned long *ul2 = (const unsigned long *)a2;
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+
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+	return ((ul1[0] ^ ul2[0]) | (ul1[1] ^ ul2[1])) == 0UL;
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+#else
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 	return a1->all[0] == a2->all[0] &&
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 	       a1->all[1] == a2->all[1] &&
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 	       a1->all[2] == a2->all[2] &&
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 	       a1->all[3] == a2->all[3];
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+#endif
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 }
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 static inline void nf_inet_addr_mask(const union nf_inet_addr *a1,
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 				     union nf_inet_addr *result,
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 				     const union nf_inet_addr *mask)
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 {
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+#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
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+	const unsigned long *ua = (const unsigned long *)a1;
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+	unsigned long *ur = (unsigned long *)result;
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+	const unsigned long *um = (const unsigned long *)mask;
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+
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+	ur[0] = ua[0] & um[0];
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+	ur[1] = ua[1] & um[1];
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+#else
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 	result->all[0] = a1->all[0] & mask->all[0];
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 	result->all[1] = a1->all[1] & mask->all[1];
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 	result->all[2] = a1->all[2] & mask->all[2];
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 	result->all[3] = a1->all[3] & mask->all[3];
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+#endif
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 }
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59
 
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 int netfilter_init(void);
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@@ -102,6 +119,7 @@
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 	 */
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 };
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+#ifdef CONFIG_NETFILTER
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 static inline struct nf_hook_ops **nf_hook_entries_get_hook_ops(const struct nf_hook_entries *e)
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 {
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 	unsigned int n = e->num_hook_entries;
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@@ -147,20 +165,15 @@
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 	/* Non-inclusive ranges: use 0/0/NULL to never get called. */
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 	int set_optmin;
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 	int set_optmax;
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-	int (*set)(struct sock *sk, int optval, void __user *user, unsigned int len);
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-#ifdef CONFIG_COMPAT
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-	int (*compat_set)(struct sock *sk, int optval,
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-			void __user *user, unsigned int len);
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-#endif
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+	int (*set)(struct sock *sk, int optval, sockptr_t arg,
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+		   unsigned int len);
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 	int get_optmin;
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 	int get_optmax;
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 	int (*get)(struct sock *sk, int optval, void __user *user, int *len);
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-#ifdef CONFIG_COMPAT
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-	int (*compat_get)(struct sock *sk, int optval,
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-			void __user *user, int *len);
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-#endif
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 	/* Use the module struct to lock set/get code in place */
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 	struct module *owner;
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+
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+	ANDROID_KABI_RESERVE(1);
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 };
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 /* Function to register/unregister hook points. */
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@@ -183,6 +196,8 @@
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 int nf_hook_slow(struct sk_buff *skb, struct nf_hook_state *state,
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 		 const struct nf_hook_entries *e, unsigned int i);
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+void nf_hook_slow_list(struct list_head *head, struct nf_hook_state *state,
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+		       const struct nf_hook_entries *e);
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 /**
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  *	nf_hook - call a netfilter hook
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  *
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@@ -295,35 +310,43 @@
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 	     struct list_head *head, struct net_device *in, struct net_device *out,
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 	     int (*okfn)(struct net *, struct sock *, struct sk_buff *))
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 {
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-	struct sk_buff *skb, *next;
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-	struct list_head sublist;
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+	struct nf_hook_entries *hook_head = NULL;
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-	INIT_LIST_HEAD(&sublist);
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-	list_for_each_entry_safe(skb, next, head, list) {
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-		skb_list_del_init(skb);
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-		if (nf_hook(pf, hook, net, sk, skb, in, out, okfn) == 1)
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-			list_add_tail(&skb->list, &sublist);
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+#ifdef CONFIG_JUMP_LABEL
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+	if (__builtin_constant_p(pf) &&
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+	    __builtin_constant_p(hook) &&
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+	    !static_key_false(&nf_hooks_needed[pf][hook]))
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+		return;
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+#endif
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+
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+	rcu_read_lock();
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+	switch (pf) {
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+	case NFPROTO_IPV4:
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+		hook_head = rcu_dereference(net->nf.hooks_ipv4[hook]);
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+		break;
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+	case NFPROTO_IPV6:
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+		hook_head = rcu_dereference(net->nf.hooks_ipv6[hook]);
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+		break;
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+	default:
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+		WARN_ON_ONCE(1);
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+		break;
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 	}
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-	/* Put passed packets back on main list */
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-	list_splice(&sublist, head);
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+
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+	if (hook_head) {
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+		struct nf_hook_state state;
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+
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+		nf_hook_state_init(&state, hook, pf, in, out, sk, net, okfn);
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+
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+		nf_hook_slow_list(head, &state, hook_head);
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+	}
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+	rcu_read_unlock();
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 }
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 /* Call setsockopt() */
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-int nf_setsockopt(struct sock *sk, u_int8_t pf, int optval, char __user *opt,
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+int nf_setsockopt(struct sock *sk, u_int8_t pf, int optval, sockptr_t opt,
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 		  unsigned int len);
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 int nf_getsockopt(struct sock *sk, u_int8_t pf, int optval, char __user *opt,
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 		  int *len);
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-#ifdef CONFIG_COMPAT
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-int compat_nf_setsockopt(struct sock *sk, u_int8_t pf, int optval,
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-		char __user *opt, unsigned int len);
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-int compat_nf_getsockopt(struct sock *sk, u_int8_t pf, int optval,
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-		char __user *opt, int *len);
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-#endif
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-
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-/* Call this before modifying an existing packet: ensures it is
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-   modifiable and linear to the point you care about (writable_len).
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-   Returns true or false. */
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-int skb_make_writable(struct sk_buff *skb, unsigned int writable_len);
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 struct flowi;
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 struct nf_queue_entry;
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@@ -353,6 +376,8 @@
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 	unsigned int (*manip_pkt)(struct sk_buff *skb, struct nf_conn *ct,
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 				  enum nf_nat_manip_type mtype,
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 				  enum ip_conntrack_dir dir);
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+
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+	ANDROID_KABI_RESERVE(1);
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 };
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 extern struct nf_nat_hook __rcu *nf_nat_hook;
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@@ -360,7 +385,7 @@
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 static inline void
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 nf_nat_decode_session(struct sk_buff *skb, struct flowi *fl, u_int8_t family)
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 {
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-#ifdef CONFIG_NF_NAT_NEEDED
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+#if IS_ENABLED(CONFIG_NF_NAT)
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 	struct nf_nat_hook *nat_hook;
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390
 
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 	rcu_read_lock();
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@@ -411,7 +436,7 @@
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 }
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 #endif /*CONFIG_NETFILTER*/
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-#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
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+#if IS_ENABLED(CONFIG_NF_CONNTRACK)
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 #include <linux/netfilter/nf_conntrack_zones_common.h>
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 extern void (*ip_ct_attach)(struct sk_buff *, const struct sk_buff *) __rcu;
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@@ -437,6 +462,8 @@
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 	void (*destroy)(struct nf_conntrack *);
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 	bool (*get_tuple_skb)(struct nf_conntrack_tuple *,
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 			      const struct sk_buff *);
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+
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+	ANDROID_KABI_RESERVE(1);
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 };
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 extern struct nf_ct_hook __rcu *nf_ct_hook;
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@@ -454,6 +481,8 @@
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 			     u32 portid, u32 report);
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 	void (*seq_adjust)(struct sk_buff *skb, struct nf_conn *ct,
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 			   enum ip_conntrack_info ctinfo, s32 off);
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+
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+	ANDROID_KABI_RESERVE(1);
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 };
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 extern struct nfnl_ct_hook __rcu *nfnl_ct_hook;
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