[PATCH bpf-next v2 02/13] bpfilter: Add logging facility
From: Dmitrii Banshchikov <hidden>
Date: 2021-08-29 18:36:40
Also in:
bpf
Subsystem:
networking [general], the rest · Maintainers:
"David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
There are three logging levels for messages: FATAL, NOTICE and DEBUG. When a message is logged with FATAL level it results in bpfilter usermode helper termination. Introduce struct context to avoid use of global objects and store there the logging parameters: log level and log sink. Signed-off-by: Dmitrii Banshchikov <redacted> --- net/bpfilter/context.h | 37 +++++++++++++++++++++++++++++++++++++ 1 file changed, 37 insertions(+) create mode 100644 net/bpfilter/context.h
diff --git a/net/bpfilter/context.h b/net/bpfilter/context.h
new file mode 100644
index 000000000000..6503eda27809
--- /dev/null
+++ b/net/bpfilter/context.h@@ -0,0 +1,37 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (c) 2021 Telegram FZ-LLC + */ + +#ifndef NET_BPFILTER_CONTEXT_H +#define NET_BPFILTER_CONTEXT_H + +#include <sys/syslog.h> + +#include <stdio.h> +#include <stdlib.h> + +struct context { + FILE *log_file; +}; + +#define BFLOG_IMPL(ctx, level, fmt, ...) \ + do { \ + if ((ctx)->log_file) \ + fprintf((ctx)->log_file, "<%d>bpfilter: " fmt, (level), ##__VA_ARGS__); \ + if ((level) == LOG_EMERG) \ + exit(EXIT_FAILURE); \ + } while (0) + +#define BFLOG_EMERG(ctx, fmt, ...) \ + BFLOG_IMPL(ctx, LOG_KERN | LOG_EMERG, "fatal error: " fmt, ##__VA_ARGS__) + +#define BFLOG_NOTICE(ctx, fmt, ...) BFLOG_IMPL(ctx, LOG_KERN | LOG_NOTICE, fmt, ##__VA_ARGS__) + +#if 0 +#define BFLOG_DEBUG(ctx, fmt, ...) BFLOG_IMPL(ctx, LOG_KERN | LOG_DEBUG, fmt, ##__VA_ARGS__) +#else +#define BFLOG_DEBUG(ctx, fmt, ...) +#endif + +#endif // NET_BPFILTER_CONTEXT_H
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2.25.1