diff options
Diffstat (limited to 'net/netfilter/nf_log.c')
| -rw-r--r-- | net/netfilter/nf_log.c | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/net/netfilter/nf_log.c b/net/netfilter/nf_log.c index 7a29a3a46172..0b6b2c874199 100644 --- a/net/netfilter/nf_log.c +++ b/net/netfilter/nf_log.c @@ -157,6 +157,63 @@ void nf_log_packet(struct net *net, } EXPORT_SYMBOL(nf_log_packet); +#define S_SIZE (1024 - (sizeof(unsigned int) + 1)) + +struct nf_log_buf { + unsigned int count; + char buf[S_SIZE + 1]; +}; +static struct nf_log_buf emergency, *emergency_ptr = &emergency; + +__printf(2, 3) int nf_log_buf_add(struct nf_log_buf *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; +} +EXPORT_SYMBOL_GPL(nf_log_buf_add); + +struct nf_log_buf *nf_log_buf_open(void) +{ + struct nf_log_buf *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; +} +EXPORT_SYMBOL_GPL(nf_log_buf_open); + +void nf_log_buf_close(struct nf_log_buf *m) +{ + m->buf[m->count] = 0; + printk("%s\n", m->buf); + + if (likely(m != &emergency)) + kfree(m); + else { + emergency_ptr = m; + local_bh_enable(); + } +} +EXPORT_SYMBOL_GPL(nf_log_buf_close); + #ifdef CONFIG_PROC_FS static void *seq_start(struct seq_file *seq, loff_t *pos) { |