target/linux/generic/patches-3.18/600-netfilter_conntrack_flush.patch

   1 --- a/net/netfilter/nf_conntrack_standalone.c
   2 +++ b/net/netfilter/nf_conntrack_standalone.c
   3 @@ -17,6 +17,7 @@
   4  #include <linux/percpu.h>
   5  #include <linux/netdevice.h>
   6  #include <linux/security.h>
   7 +#include <linux/inet.h>
   8  #include <net/net_namespace.h>
   9  #ifdef CONFIG_SYSCTL
  10  #include <linux/sysctl.h>
  11 @@ -262,10 +263,66 @@ static int ct_open(struct inode *inode,
  12                         sizeof(struct ct_iter_state));
  13  }
  14
  15 +struct kill_request {
  16 +       u16 family;
  17 +       union nf_inet_addr addr;
  18 +};
  19 +
  20 +static int kill_matching(struct nf_conn *i, void *data)
  21 +{
  22 +       struct kill_request *kr = data;
  23 +       struct nf_conntrack_tuple *t1 = &i->tuplehash[IP_CT_DIR_ORIGINAL].tuple;
  24 +       struct nf_conntrack_tuple *t2 = &i->tuplehash[IP_CT_DIR_REPLY].tuple;
  25 +
  26 +       if (!kr->family)
  27 +               return 1;
  28 +
  29 +       if (t1->src.l3num != kr->family)
  30 +               return 0;
  31 +
  32 +       return (nf_inet_addr_cmp(&kr->addr, &t1->src.u3) ||
  33 +               nf_inet_addr_cmp(&kr->addr, &t1->dst.u3) ||
  34 +               nf_inet_addr_cmp(&kr->addr, &t2->src.u3) ||
  35 +               nf_inet_addr_cmp(&kr->addr, &t2->dst.u3));
  36 +}
  37 +
  38 +static ssize_t ct_file_write(struct file *file, const char __user *buf,
  39 +                            size_t count, loff_t *ppos)
  40 +{
  41 +       struct seq_file *seq = file->private_data;
  42 +       struct net *net = seq_file_net(seq);
  43 +       struct kill_request kr = { };
  44 +       char req[INET6_ADDRSTRLEN] = { };
  45 +
  46 +       if (count == 0)
  47 +               return 0;
  48 +
  49 +       if (count >= INET6_ADDRSTRLEN)
  50 +               count = INET6_ADDRSTRLEN - 1;
  51 +
  52 +       if (copy_from_user(req, buf, count))
  53 +               return -EFAULT;
  54 +
  55 +       if (strnchr(req, count, ':')) {
  56 +               kr.family = AF_INET6;
  57 +               if (!in6_pton(req, count, (void *)&kr.addr, '\n', NULL))
  58 +                       return -EINVAL;
  59 +       } else if (strnchr(req, count, '.')) {
  60 +               kr.family = AF_INET;
  61 +               if (!in4_pton(req, count, (void *)&kr.addr, '\n', NULL))
  62 +                       return -EINVAL;
  63 +       }
  64 +
  65 +       nf_ct_iterate_cleanup(net, kill_matching, &kr, 0, 0);
  66 +
  67 +       return count;
  68 +}
  69 +
  70  static const struct file_operations ct_file_ops = {
  71         .owner   = THIS_MODULE,
  72         .open    = ct_open,
  73         .read    = seq_read,
  74 +       .write   = ct_file_write,
  75         .llseek  = seq_lseek,
  76         .release = seq_release_net,
  77  };
  78 @@ -367,7 +424,7 @@ static int nf_conntrack_standalone_init_
  79  {
  80         struct proc_dir_entry *pde;
  81
  82 -       pde = proc_create("nf_conntrack", 0440, net->proc_net, &ct_file_ops);
  83 +       pde = proc_create("nf_conntrack", 0660, net->proc_net, &ct_file_ops);
  84         if (!pde)
  85                 goto out_nf_conntrack;
  86