netfilter: nf_log: move log buffering to core logging

This patch moves Eric Dumazet's log buffer implementation from the
xt_log.h header file to the core net/netfilter/nf_log.c. This also
includes the renaming of the structure and functions to avoid possible
undesired namespace clashes.

This change allows us to use it from the arp and bridge packet logging
implementation in follow up patches.

2 files changed, 6 insertions, 54 deletions

diff --git a/include/net/netfilter/nf_log.h b/include/net/netfilter/nf_log.h
index 06b4c6b07f52..aaec845de106 100644
--- a/include/net/netfilter/nf_log.h
+++ b/include/net/netfilter/nf_log.h
@@ -72,4 +72,10 @@ void nf_log_packet(struct net *net,
 		   const struct nf_loginfo *li,
 		   const char *fmt, ...);
 
+struct nf_log_buf;
+
+struct nf_log_buf *nf_log_buf_open(void);
+__printf(2, 3) int nf_log_buf_add(struct nf_log_buf *m, const char *f, ...);
+void nf_log_buf_close(struct nf_log_buf *m);
+
 #endif /* _NF_LOG_H */
diff --git a/include/net/netfilter/xt_log.h b/include/net/netfilter/xt_log.h
deleted file mode 100644
index 9d9756cca013..000000000000
--- a/include/net/netfilter/xt_log.h
+++ /dev/null
@@ -1,54 +0,0 @@
-#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 __printf(2, 3) 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 {
-		emergency_ptr = m;
-		local_bh_enable();
-	}
-}
-