linux/net/netfilter/nf_sockopt.c

// SPDX-License-Identifier: GPL-2.0
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/skbuff.h>
#include <linux/netfilter.h>
#include <linux/mutex.h>
#include <net/sock.h>

#include "nf_internals.h"

/* Sockopts only registered and called from user context, so
   net locking would be overkill.  Also, [gs]etsockopt calls may
   sleep. */
static DEFINE_MUTEX(nf_sockopt_mutex);
static LIST_HEAD(nf_sockopts);

/* Do exclusive ranges overlap? */
static inline int overlap(int min1, int max1, int min2, int max2)
{ … }

/* Functions to register sockopt ranges (exclusive). */
int nf_register_sockopt(struct nf_sockopt_ops *reg)
{ … }
EXPORT_SYMBOL(…);

void nf_unregister_sockopt(struct nf_sockopt_ops *reg)
{ … }
EXPORT_SYMBOL(…);

static struct nf_sockopt_ops *nf_sockopt_find(struct sock *sk, u_int8_t pf,
		int val, int get)
{ … }

int nf_setsockopt(struct sock *sk, u_int8_t pf, int val, sockptr_t opt,
		  unsigned int len)
{ … }
EXPORT_SYMBOL(…);

int nf_getsockopt(struct sock *sk, u_int8_t pf, int val, char __user *opt,
		  int *len)
{ … }
EXPORT_SYMBOL(…);