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5108879730
freebsd/sys/net/route/route_debug.h
Alexander V. Chernikov 4bccbf03d8 routing: allow logging framework to be used outside of the subsystem 
MFC after:	2 weeks
2022-09-05 10:44:27 +00:00

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/*-
* Copyright (c) 2021
* Alexander V. Chernikov <melifaro@FreeBSD.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#ifndef _NET_ROUTE_DEBUG_H_
#define _NET_ROUTE_DEBUG_H_
#include <sys/sysctl.h>
#include <sys/syslog.h>
/* DEBUG logic */
#if defined(DEBUG_MOD_NAME) && defined(DEBUG_MAX_LEVEL)
#ifndef _DEBUG_SYSCTL_OID
#define _DEBUG_SYSCTL_OID _net_route_debug
SYSCTL_DECL(_net_route_debug);
#endif
#define DEBUG_VAR_NAME _DEBUG_VAR_NAME(DEBUG_MOD_NAME)
#define _DEBUG_VAR_NAME(a) _DEBUG_VAR_NAME_INDIRECT(a)
#define _DEBUG_VAR_NAME_INDIRECT(prefix) prefix##_debug_level
#define DEBUG_PREFIX_NAME _DEBUG_PREFIX_NAME(DEBUG_MOD_NAME)
#define _DEBUG_PREFIX_NAME(n) __DEBUG_PREFIX_NAME(n)
#define __DEBUG_PREFIX_NAME(n) #n
#define _DECLARE_DEBUG(_default_level) \
static int DEBUG_VAR_NAME = _default_level; \
SYSCTL_INT(_DEBUG_SYSCTL_OID, OID_AUTO, DEBUG_VAR_NAME, \
CTLFLAG_RW | CTLFLAG_RWTUN, \
&(DEBUG_VAR_NAME), 0, "debuglevel")
/* Additional tracing levels not defined by log.h */
#ifndef LOG_DEBUG2
#define LOG_DEBUG2 8
#endif
#ifndef LOG_DEBUG3
#define LOG_DEBUG3 9
#endif
/*
* Severity usage guidelines:
*
* LOG_WARNING - subsystem-global errors ("multipath init failed")
*
* LOG_INFO - subsystem non-transient errors ("Failed to unlink nexhop").
* All logging <= LOG_INFO by default will be written to syslog.
*
* LOG_DEBUG - subsystem debug. Not-too often events (hash resizes, recoverable failures).
* These are compiled in by default on production. Turning it it should NOT notable affect
* performance
* LOG_DEBUG2 - more debug. Per-item level (nhg,nh,route) debug, up to multiple lines per item.
* This is NOT compiled in by default. Turning it on should NOT seriously impact performance
* LOG_DEBUG3 - last debug level. Per-item large debug outputs.
* This is NOT compiled in by default. All performance bets are off.
*
*/
#define _output printf
#define _DEBUG_PASS_MSG(_l) (DEBUG_VAR_NAME >= (_l))
#define IF_DEBUG_LEVEL(_l) if ((DEBUG_MAX_LEVEL >= (_l)) && (__predict_false(DEBUG_VAR_NAME >= (_l))))
/*
* Logging for events specific for particular family and fib
* Example: [nhop_neigh] inet.0 find_lle: nhop nh#4/inet/vtnet0/10.0.0.1: mapped to lle NULL
*/
#define FIB_LOG(_l, _fib, _fam, _fmt, ...) FIB_LOG_##_l(_l, _fib, _fam, _fmt, ## __VA_ARGS__)
#define _FIB_LOG(_l, _fib, _fam, _fmt, ...) if (_DEBUG_PASS_MSG(_l)) { \
_output("[" DEBUG_PREFIX_NAME "] %s.%u %s: " _fmt "\n", rib_print_family(_fam), _fib, __func__, ##__VA_ARGS__); \
}
/* Same as FIB_LOG, but uses nhop to get fib and family */
#define FIB_NH_LOG(_l, _nh, _fmt, ...) FIB_LOG_##_l(_l, nhop_get_fibnum(_nh), nhop_get_upper_family(_nh), _fmt, ## __VA_ARGS__)
/* Same as FIB_LOG, but uses rib_head to get fib and family */
#define FIB_RH_LOG(_l, _rh, _fmt, ...) FIB_LOG_##_l(_l, (_rh)->rib_fibnum, (_rh)->rib_family, _fmt, ## __VA_ARGS__)
/* Same as FIB_LOG, but uses nh_control to get fib and family from linked rib */
#define FIB_CTL_LOG(_l, _ctl, _fmt, ...) FIB_LOG_##_l(_l, (_ctl)->ctl_rh->rib_fibnum, (_ctl)->ctl_rh->rib_family, _fmt, ## __VA_ARGS__)
/*
* Generic logging for routing subsystem
* Example: [nhop_neigh] nhops_update_neigh: L2 prepend update from lle/inet/valid/vtnet0/10.0.0.157
*/
#define RT_LOG(_l, _fmt, ...) RT_LOG_##_l(_l, _fmt, ## __VA_ARGS__)
#define _RT_LOG(_l, _fmt, ...) if (_DEBUG_PASS_MSG(_l)) { \
_output("[" DEBUG_PREFIX_NAME "] %s: " _fmt "\n", __func__, ##__VA_ARGS__); \
}
/*
* Wrapper logic to avoid compiling high levels of debugging messages for production systems.
*/
#if DEBUG_MAX_LEVEL>=LOG_DEBUG3
#define FIB_LOG_LOG_DEBUG3 _FIB_LOG
#define RT_LOG_LOG_DEBUG3 _RT_LOG
#else
#define FIB_LOG_LOG_DEBUG3(_l, _fib, _fam, _fmt, ...)
#define RT_LOG_LOG_DEBUG3(_l, _fmt, ...)
#endif
#if DEBUG_MAX_LEVEL>=LOG_DEBUG2
#define FIB_LOG_LOG_DEBUG2 _FIB_LOG
#define RT_LOG_LOG_DEBUG2 _RT_LOG
#else
#define FIB_LOG_LOG_DEBUG2(_l, _fib, _fam, _fmt, ...)
#define RT_LOG_LOG_DEBUG2(_l, _fmt, ...)
#endif
#if DEBUG_MAX_LEVEL>=LOG_DEBUG
#define FIB_LOG_LOG_DEBUG _FIB_LOG
#define RT_LOG_LOG_DEBUG _RT_LOG
#else
#define FIB_LOG_LOG_DEBUG(_l, _fib, _fam, _fmt, ...)
#define RT_LOG_LOG_DEBUG(_l, _fmt, ...)
#endif
#if DEBUG_MAX_LEVEL>=LOG_INFO
#define FIB_LOG_LOG_INFO _FIB_LOG
#define RT_LOG_LOG_INFO _RT_LOG
#else
#define FIB_LOG_LOG_INFO(_l, _fib, _fam, _fmt, ...)
#define RT_LOG_LOG_INFO(_l, _fmt, ...)
#endif
#define FIB_LOG_LOG_NOTICE _FIB_LOG
#define FIB_LOG_LOG_ERR _FIB_LOG
#define FIB_LOG_LOG_WARNING _FIB_LOG
#define RT_LOG_LOG_NOTICE _RT_LOG
#define RT_LOG_LOG_ERR _RT_LOG
#define RT_LOG_LOG_WARNING _RT_LOG
#endif
/* Helpers for fancy-printing various objects */
struct nhop_object;
struct nhgrp_object;
struct llentry;
struct nhop_neigh;
struct rtentry;
struct ifnet;
#define NHOP_PRINT_BUFSIZE 48
char *nhop_print_buf(const struct nhop_object *nh, char *buf, size_t bufsize);
char *nhop_print_buf_any(const struct nhop_object *nh, char *buf, size_t bufsize);
char *nhgrp_print_buf(const struct nhgrp_object *nhg, char *buf, size_t bufsize);
char *llentry_print_buf(const struct llentry *lle, struct ifnet *ifp, int family, char *buf,
size_t bufsize);
char *llentry_print_buf_lltable(const struct llentry *lle, char *buf, size_t bufsize);
char *neigh_print_buf(const struct nhop_neigh *nn, char *buf, size_t bufsize);
char *rt_print_buf(const struct rtentry *rt, char *buf, size_t bufsize);
const char *rib_print_cmd(int rib_cmd);
#endif
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