mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 02:39:48 +00:00
![Christoph Hellwig](/assets/img/avatar_default.png)
Pass a sockptr_t to prepare for set_fs-less handling of the kernel pointer from bpf-cgroup. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: David S. Miller <davem@davemloft.net>
120 lines
2.8 KiB
C
120 lines
2.8 KiB
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)
|
|
{
|
|
return max1 > min2 && min1 < max2;
|
|
}
|
|
|
|
/* Functions to register sockopt ranges (exclusive). */
|
|
int nf_register_sockopt(struct nf_sockopt_ops *reg)
|
|
{
|
|
struct nf_sockopt_ops *ops;
|
|
int ret = 0;
|
|
|
|
mutex_lock(&nf_sockopt_mutex);
|
|
list_for_each_entry(ops, &nf_sockopts, list) {
|
|
if (ops->pf == reg->pf
|
|
&& (overlap(ops->set_optmin, ops->set_optmax,
|
|
reg->set_optmin, reg->set_optmax)
|
|
|| overlap(ops->get_optmin, ops->get_optmax,
|
|
reg->get_optmin, reg->get_optmax))) {
|
|
pr_debug("nf_sock overlap: %u-%u/%u-%u v %u-%u/%u-%u\n",
|
|
ops->set_optmin, ops->set_optmax,
|
|
ops->get_optmin, ops->get_optmax,
|
|
reg->set_optmin, reg->set_optmax,
|
|
reg->get_optmin, reg->get_optmax);
|
|
ret = -EBUSY;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
list_add(®->list, &nf_sockopts);
|
|
out:
|
|
mutex_unlock(&nf_sockopt_mutex);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(nf_register_sockopt);
|
|
|
|
void nf_unregister_sockopt(struct nf_sockopt_ops *reg)
|
|
{
|
|
mutex_lock(&nf_sockopt_mutex);
|
|
list_del(®->list);
|
|
mutex_unlock(&nf_sockopt_mutex);
|
|
}
|
|
EXPORT_SYMBOL(nf_unregister_sockopt);
|
|
|
|
static struct nf_sockopt_ops *nf_sockopt_find(struct sock *sk, u_int8_t pf,
|
|
int val, int get)
|
|
{
|
|
struct nf_sockopt_ops *ops;
|
|
|
|
mutex_lock(&nf_sockopt_mutex);
|
|
list_for_each_entry(ops, &nf_sockopts, list) {
|
|
if (ops->pf == pf) {
|
|
if (!try_module_get(ops->owner))
|
|
goto out_nosup;
|
|
|
|
if (get) {
|
|
if (val >= ops->get_optmin &&
|
|
val < ops->get_optmax)
|
|
goto out;
|
|
} else {
|
|
if (val >= ops->set_optmin &&
|
|
val < ops->set_optmax)
|
|
goto out;
|
|
}
|
|
module_put(ops->owner);
|
|
}
|
|
}
|
|
out_nosup:
|
|
ops = ERR_PTR(-ENOPROTOOPT);
|
|
out:
|
|
mutex_unlock(&nf_sockopt_mutex);
|
|
return ops;
|
|
}
|
|
|
|
int nf_setsockopt(struct sock *sk, u_int8_t pf, int val, sockptr_t opt,
|
|
unsigned int len)
|
|
{
|
|
struct nf_sockopt_ops *ops;
|
|
int ret;
|
|
|
|
ops = nf_sockopt_find(sk, pf, val, 0);
|
|
if (IS_ERR(ops))
|
|
return PTR_ERR(ops);
|
|
ret = ops->set(sk, val, opt, len);
|
|
module_put(ops->owner);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(nf_setsockopt);
|
|
|
|
int nf_getsockopt(struct sock *sk, u_int8_t pf, int val, char __user *opt,
|
|
int *len)
|
|
{
|
|
struct nf_sockopt_ops *ops;
|
|
int ret;
|
|
|
|
ops = nf_sockopt_find(sk, pf, val, 1);
|
|
if (IS_ERR(ops))
|
|
return PTR_ERR(ops);
|
|
ret = ops->get(sk, val, opt, len);
|
|
module_put(ops->owner);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(nf_getsockopt);
|