netfilter: add missing xt_log.h file

Forgot to add xt_log.h in commit a8defca0 (netfilter: ipt_LOG:
add bufferisation to call printk() once)

Signed-off-by: Patrick McHardy <kaber@trash.net>

1 files changed, 54 insertions, 0 deletions

diff --git a/include/net/netfilter/xt_log.h b/include/net/netfilter/xt_log.h
new file mode 100644
index 000000000000..0dfb34a5b53c
--- /dev/null
+++ b/include/net/netfilter/xt_log.h
@@ -0,0 +1,54 @@
+#define S_SIZE (1024 - (sizeof(unsigned int) + 1))
+
+struct sbuff {
+        unsigned int    count;
+        char            buf[S_SIZE + 1];
+};
+static struct sbuff emergency, *emergency_ptr = &emergency;
+
+static int sb_add(struct sbuff *m, const char *f, ...)
+{
+        va_list args;
+        int len;
+
+        if (likely(m->count < S_SIZE)) {
+                va_start(args, f);
+                len = vsnprintf(m->buf + m->count, S_SIZE - m->count, f, args);
+                va_end(args);
+                if (likely(m->count + len < S_SIZE)) {
+                        m->count += len;
+                        return 0;
+                }
+        }
+        m->count = S_SIZE;
+        printk_once(KERN_ERR KBUILD_MODNAME " please increase S_SIZE\n");
+        return -1;
+}
+
+static struct sbuff *sb_open(void)
+{
+        struct sbuff *m = kmalloc(sizeof(*m), GFP_ATOMIC);
+
+        if (unlikely(!m)) {
+                local_bh_disable();
+                do {
+                        m = xchg(&emergency_ptr, NULL);
+                } while (!m);
+        }
+        m->count = 0;
+        return m;
+}
+
+static void sb_close(struct sbuff *m)
+{
+        m->buf[m->count] = 0;
+        printk("%s\n", m->buf);
+
+        if (likely(m != &emergency))
+                kfree(m);
+        else {
+                xchg(&emergency_ptr, m);
+                local_bh_enable();
+        }
+}
+