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chaindbg.c
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chaindbg.c
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/*
* chaindbg.c
* Linux kernel networking subsystem chains debug module
*
* This module will register chain handlers and print information about events
* which have occurred with useful additional information related to them.
*
* Distributed under the terms of the GNU GPL version 2.
* Copyright (c) Nikolay Aleksandrov (nik@BlackWall.org) 2012
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/netdevice.h>
#include <linux/rcupdate.h>
#include <linux/rtnetlink.h>
#include <linux/inetdevice.h>
#include <linux/if_vlan.h>
#if defined(CONFIG_IPV6) || (defined(CONFIG_IPV6_MODULE) && defined(MODULE))
#include <net/if_inet6.h>
#include <net/addrconf.h>
#endif
#ifdef NETDEV_CHANGEINFODATA
#define ND_END NETDEV_CHANGEINFODATA
#elif defined(NETDEV_PRECHANGEMTU)
#define ND_END NETDEV_PRECHANGEMTU
#else
#define ND_END NETDEV_JOIN
#endif
/* Taken from include/linux/netdevice.h */
static const char *ND_EVENTS[] = {
"",
"UP",
"DOWN",
"REBOOT",
"CHANGE",
"REGISTER",
"UNREGISTER",
"CHANGEMTU",
"CHANGEADDR",
"GOING_DOWN",
"CHANGENAME",
"FEAT_CHANGE",
"BONDING_FAILOVER",
"PRE_UP",
"PRE_TYPE_CHANGE",
"POST_TYPE_CHANGE",
"POST_INIT",
"UNREGISTER_FINAL",
"RELEASE",
"NOTIFY_PEERS",
"JOIN",
#ifdef NETDEV_PRECHANGEMTU
"CHANGEUPPER",
"RESEND_IGMP",
"PRECHANGEMTU",
#endif
#ifdef NETDEV_CHANGEINFODATA
"CHANGEINFODATA",
#endif
NULL
};
/* Taken from net/core/ethtool.c and include/linux/netdev_features.h */
static const char *netdev_features_strings[] = {
"tx-scatter-gather",
"tx-checksum-ipv4",
"UNUSED_NETIF_F_1",
"tx-checksum-ip-generic",
"tx-checksum-ipv6",
"highdma",
"tx-scatter-gather-fraglist",
"tx-vlan-hw-insert",
"rx-vlan-hw-parse",
"rx-vlan-filter",
"vlan-challenged",
"tx-generic-segmentation",
"tx-lockless",
"netns-local",
"rx-gro",
"rx-lro",
"tx-tcp-segmentation",
"tx-udp-fragmentation",
"tx-gso-robust",
"tx-tcp-ecn-segmentation",
"tx-tcp6-segmentation",
"tx-fcoe-segmentation",
"GSO_RESERVED1",
"GSO_RESERVED2",
"tx-checksum-fcoe-crc",
"tx-checksum-sctp",
"fcoe-mtu",
"rx-ntuple-filter",
"rx-hashing",
"rx-checksum",
"tx-nocache-copy",
"loopback",
"rx-fcs",
"rx-all",
"tx-vlan-stag-hw-insert",
"rx-vlan-stag-hw-parse",
"rx-vlan-stag-filter",
"l2-fwd-offload",
"busy-poll",
NULL
};
/* Taken from uapi/linux/if.h */
static const char *netdev_flags[] =
{
"IFF_UP",
"IFF_BROADCAST",
"IFF_DEBUG",
"IFF_LOOPBACK",
"IFF_POINTOPOINT",
"IFF_NOTRAILERS",
"IFF_RUNNING",
"IFF_NOARP",
"IFF_PROMISC",
"IFF_ALLMULTI",
"IFF_MASTER",
"IFF_SLAVE",
"IFF_MULTICAST",
"IFF_PORTSEL",
"IFF_AUTOMEDIA",
"IFF_DYNAMIC",
"IFF_LOWER_UP",
"IFF_DORMANT",
"IFF_ECHO",
NULL
};
/* Not yet
static const char *netdev_priv_flags[] =
{
"IFF_802_1Q_VLAN",
"IFF_EBRIDGE",
"IFF_SLAVE_INACTIVE",
"IFF_MASTER_8023AD",
"IFF_MASTER_ALB",
"IFF_BONDING",
"IFF_SLAVE_NEEDARP",
"IFF_ISATAP",
"IFF_MASTER_ARPMON",
"IFF_WAN_HDLC",
"IFF_XMIT_DST_RELEASE",
"IFF_DONT_BRIDGE",
"IFF_DISABLE_NETPOLL",
"IFF_MACVLAN_PORT",
"IFF_BRIDGE_PORT",
"IFF_OVS_DATAPATH",
"IFF_TX_SKB_SHARING",
"IFF_UNICAST_FLT",
"IFF_TEAM_PORT",
"IFF_SUPP_NOFCS",
"IFF_LIVE_ADDR_CHANGE",
NULL
};
*/
void cdbg_get_strings(unsigned long long bits, int bitlen,
const char *strings[], char *buf, int buflen)
{
int i;
for(i = 0; i < bitlen % ((sizeof(unsigned long long) * 8) + 1); i++) {
if (strings[i] == NULL)
return;
if ((bits>>i) & 0x1)
/* Apparently such call to sprintf should not be defined
* but in all implementations I've seen this works
* except for GNU libc. Since this module is for the
* Linux kernel and such a call works there...
*/
snprintf(buf, buflen, "%s %s", buf, strings[i]);
}
}
#ifdef CONFIG_INET
static int cdbg_netdev_event(struct notifier_block *this,
unsigned long event, void *ptr)
{
int buflen = 128 + ((sizeof(netdev_features_strings)/sizeof(char*))*32);
struct net_device *dev = netdev_notifier_info_to_dev(ptr);
char *nd_buf;
nd_buf = kzalloc(buflen, GFP_KERNEL);
if (nd_buf == NULL)
return NOTIFY_DONE;
snprintf(nd_buf, buflen, "C: NETDEV DEV: %s EVENT: NETDEV_%s (0x%lx)",
dev->name, event > ND_END ? "" : ND_EVENTS[event], event);
switch (event) {
case NETDEV_CHANGEADDR:
snprintf(nd_buf, buflen, "%s MAC: %pM", nd_buf, dev->dev_addr);
break;
#ifdef NETDEV_PRECHANGEMTU
case NETDEV_PRECHANGEMTU:
#endif
case NETDEV_CHANGEMTU:
snprintf(nd_buf, buflen, "%s %s MTU: %d",
nd_buf, event == NETDEV_CHANGEMTU ? "NEW" : "OLD",
dev->mtu);
break;
case NETDEV_PRE_TYPE_CHANGE:
case NETDEV_POST_TYPE_CHANGE:
snprintf(nd_buf, buflen, "%s %s TYPE: 0x%x",
nd_buf, event == NETDEV_POST_TYPE_CHANGE ? "NEW" :
"OLD",
dev->type);
break;
case NETDEV_CHANGE:
snprintf(nd_buf, buflen, "%s FLAGS: (0x%x)", nd_buf, dev->flags);
cdbg_get_strings(dev->flags, sizeof(dev->flags) * 8,
netdev_flags, nd_buf, buflen);
break;
case NETDEV_FEAT_CHANGE:
snprintf(nd_buf, buflen, "%s FEATURES: (0x%llx)", nd_buf, (unsigned long long)(dev->features));
cdbg_get_strings((unsigned long long)dev->features,
NETDEV_FEATURE_COUNT, netdev_features_strings,
nd_buf, buflen);
break;
default:
break;
}
pr_info("%s\n", nd_buf);
kfree(nd_buf);
return NOTIFY_DONE;
}
static int cdbg_inetaddr_event(struct notifier_block *this,
unsigned long event, void *ptr)
{
struct in_ifaddr *ifa = (struct in_ifaddr *)ptr;
struct net_device *dev;
dev = ifa->ifa_dev ? ifa->ifa_dev->dev : NULL;
if (dev == NULL)
return NOTIFY_DONE;
printk(KERN_INFO "C: INETADDR DEV: %s EVENT: NETDEV_%s (0x%lx) ADDR: %pI4\n",
dev->name, event > ND_END ? "" : ND_EVENTS[event], event,
&ifa->ifa_address);
return NOTIFY_DONE;
}
static struct notifier_block cdbg_netdev_cb = {
.notifier_call = cdbg_netdev_event,
};
static struct notifier_block cdbg_inetaddr_cb = {
.notifier_call = cdbg_inetaddr_event,
};
#endif /* CONFIG_INET */
#if defined(CONFIG_IPV6) || (defined(CONFIG_IPV6_MODULE) && defined(MODULE))
static int cdbg_inet6addr_event(struct notifier_block *this,
unsigned long event, void *ptr)
{
struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)ptr;
struct net_device *dev;
dev = ifa->idev ? ifa->idev->dev : NULL;
if (dev == NULL)
return NOTIFY_DONE;
printk(KERN_INFO "C: INET6ADDR DEV: %s EVENT: NETDEV_%s (0x%lx) ADDR: %pI6\n",
dev->name, event > ND_END ? "" : ND_EVENTS[event], event,
&ifa->addr);
return NOTIFY_DONE;
}
static struct notifier_block cdbg_inet6addr_cb = {
.notifier_call = cdbg_inet6addr_event,
};
#endif /* IPV6 */
static int __init cdbg_init(void)
{
printk(KERN_INFO "CHAINDBG loading\n");
#ifdef CONFIG_INET
register_netdevice_notifier(&cdbg_netdev_cb);
register_inetaddr_notifier(&cdbg_inetaddr_cb);
#endif
#if defined(CONFIG_IPV6) || (defined(CONFIG_IPV6_MODULE) && defined(MODULE))
register_inet6addr_notifier(&cdbg_inet6addr_cb);
#endif
return 0;
}
static void __exit cdbg_exit(void)
{
printk(KERN_INFO "CHAINDBG unloading\n");
#ifdef CONFIG_INET
unregister_netdevice_notifier(&cdbg_netdev_cb);
unregister_inetaddr_notifier(&cdbg_inetaddr_cb);
#endif
#if defined(CONFIG_IPV6) || (defined(CONFIG_IPV6_MODULE) && defined(MODULE))
unregister_inet6addr_notifier(&cdbg_inet6addr_cb);
#endif
}
module_init(cdbg_init);
module_exit(cdbg_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Nikolay Aleksandrov <nik@BlackWall.org>");