net/ipv4/bpfilter/sockopt.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <linux/uaccess.h>
   3 #include <linux/bpfilter.h>
   4 #include <uapi/linux/bpf.h>
   5 #include <linux/wait.h>
   6 #include <linux/kmod.h>
   7
   8 int (*bpfilter_process_sockopt)(struct sock *sk, int optname,
   9                                 char __user *optval,
  10                                 unsigned int optlen, bool is_set);
  11 EXPORT_SYMBOL_GPL(bpfilter_process_sockopt);
  12
  13 static int bpfilter_mbox_request(struct sock *sk, int optname,
  14                                  char __user *optval,
  15                                  unsigned int optlen, bool is_set)
  16 {
  17         if (!bpfilter_process_sockopt) {
  18                 int err = request_module("bpfilter");
  19
  20                 if (err)
  21                         return err;
  22                 if (!bpfilter_process_sockopt)
  23                         return -ECHILD;
  24         }
  25         return bpfilter_process_sockopt(sk, optname, optval, optlen, is_set);
  26 }
  27
  28 int bpfilter_ip_set_sockopt(struct sock *sk, int optname, char __user *optval,
  29                             unsigned int optlen)
  30 {
  31         return bpfilter_mbox_request(sk, optname, optval, optlen, true);
  32 }
  33
  34 int bpfilter_ip_get_sockopt(struct sock *sk, int optname, char __user *optval,
  35                             int __user *optlen)
  36 {
  37         int len;
  38
  39         if (get_user(len, optlen))
  40                 return -EFAULT;
  41
  42         return bpfilter_mbox_request(sk, optname, optval, len, false);
  43 }