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[NETFILTER]: Extend netfilter logging API

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This patch is in preparation to nfnetlink_log:
- loggers now have to register struct nf_logger instead of nf_logfn
- nf_log_unregister() replaced by nf_log_unregister_pf() and
  nf_log_unregister_logger()
- add comment to ip[6]t_LOG.h to assure nobody redefines flags
- add /proc/net/netfilter/nf_log to tell user which logger is currently
  registered for which address family
- if user has configured logging, but no logging backend (logger) is
  available, always spit a message to syslog, not just the first time.
- split ip[6]t_LOG.c into two parts:
  Backend: Always try to register as logger for the respective address family
  Frontend: Always log via nf_log_packet() API
- modify all users of nf_log_packet() to accomodate additional argument

Signed-off-by: Harald Welte <laforge@netfilter.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Harald Welte 2005-08-09 19:58:27 -07:00 committed by David S. Miller
parent 838ab63649
commit 608c8e4f7b
10 changed files with 299 additions and 125 deletions
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48
include/linux/netfilter.h
View File

@ -114,15 +114,51 @@ void nf_unregister_sockopt(struct nf_sockopt_ops *reg);
extern struct list_head nf_hooks[NPROTO][NF_MAX_HOOKS];
typedef void nf_logfn(unsigned int hooknum,
/* those NF_LOG_* defines and struct nf_loginfo are legacy definitios that will
* disappear once iptables is replaced with pkttables. Please DO NOT use them
* for any new code! */
#define NF_LOG_TCPSEQ 0x01 /* Log TCP sequence numbers */
#define NF_LOG_TCPOPT 0x02 /* Log TCP options */
#define NF_LOG_IPOPT 0x04 /* Log IP options */
#define NF_LOG_UID 0x08 /* Log UID owning local socket */
#define NF_LOG_MASK 0x0f
#define NF_LOG_TYPE_LOG 0x01
#define NF_LOG_TYPE_ULOG 0x02
struct nf_loginfo {
u_int8_t type;
union {
struct {
u_int32_t copy_len;
u_int16_t group;
u_int16_t qthreshold;
} ulog;
struct {
u_int8_t level;
u_int8_t logflags;
} log;
} u;
};
typedef void nf_logfn(unsigned int pf,
unsigned int hooknum,
const struct sk_buff *skb,
const struct net_device *in,
const struct net_device *out,
const struct nf_loginfo *li,
const char *prefix);
struct nf_logger {
struct module *me;
nf_logfn *logfn;
char *name;
};
/* Function to register/unregister log function. */
int nf_log_register(int pf, nf_logfn *logfn);
void nf_log_unregister(int pf, nf_logfn *logfn);
int nf_log_register(int pf, struct nf_logger *logger);
void nf_log_unregister_pf(int pf);
void nf_log_unregister_logger(struct nf_logger *logger);
/* Calls the registered backend logging function */
void nf_log_packet(int pf,
@ -130,6 +166,7 @@ void nf_log_packet(int pf,
const struct sk_buff *skb,
const struct net_device *in,
const struct net_device *out,
struct nf_loginfo *li,
const char *fmt, ...);
/* Activate hook; either okfn or kfree_skb called, unless a hook
@ -221,6 +258,11 @@ struct nf_queue_rerouter {
extern int nf_register_queue_rerouter(int pf, struct nf_queue_rerouter *rer);
extern int nf_unregister_queue_rerouter(int pf);
#ifdef CONFIG_PROC_FS
#include <linux/proc_fs.h>
extern struct proc_dir_entry *proc_net_netfilter;
#endif
#else /* !CONFIG_NETFILTER */
#define NF_HOOK(pf, hook, skb, indev, outdev, okfn) (okfn)(skb)
static inline void nf_ct_attach(struct sk_buff *new, struct sk_buff *skb) {}

1
include/linux/netfilter_ipv4/ipt_LOG.h
View File

@ -1,6 +1,7 @@
#ifndef _IPT_LOG_H
#define _IPT_LOG_H
/* make sure not to change this without changing netfilter.h:NF_LOG_* (!) */
#define IPT_LOG_TCPSEQ 0x01 /* Log TCP sequence numbers */
#define IPT_LOG_TCPOPT 0x02 /* Log TCP options */
#define IPT_LOG_IPOPT 0x04 /* Log IP options */

1
include/linux/netfilter_ipv6/ip6t_LOG.h
View File

@ -1,6 +1,7 @@
#ifndef _IP6T_LOG_H
#define _IP6T_LOG_H
/* make sure not to change this without changing netfilter.h:NF_LOG_* (!) */
#define IP6T_LOG_TCPSEQ 0x01 /* Log TCP sequence numbers */
#define IP6T_LOG_TCPOPT 0x02 /* Log TCP options */
#define IP6T_LOG_IPOPT 0x04 /* Log IP options */

127
net/core/netfilter.c
View File

@ -22,6 +22,7 @@
#include <linux/if.h>
#include <linux/netdevice.h>
#include <linux/inetdevice.h>
#include <linux/proc_fs.h>
#include <net/sock.h>
/* In this code, we can be waiting indefinitely for userspace to
@ -535,11 +536,10 @@ EXPORT_SYMBOL(skb_make_writable);
#define NF_LOG_PREFIXLEN 128
static nf_logfn *nf_logging[NPROTO]; /* = NULL */
static int reported = 0;
static struct nf_logger *nf_logging[NPROTO]; /* = NULL */
static DEFINE_SPINLOCK(nf_log_lock);
int nf_log_register(int pf, nf_logfn *logfn)
int nf_log_register(int pf, struct nf_logger *logger)
{
int ret = -EBUSY;
@ -547,54 +547,134 @@ int nf_log_register(int pf, nf_logfn *logfn)
* substituting pointer. */
spin_lock(&nf_log_lock);
if (!nf_logging[pf]) {
rcu_assign_pointer(nf_logging[pf], logfn);
rcu_assign_pointer(nf_logging[pf], logger);
ret = 0;
}
spin_unlock(&nf_log_lock);
return ret;
}
void nf_log_unregister(int pf, nf_logfn *logfn)
void nf_log_unregister_pf(int pf)
{
spin_lock(&nf_log_lock);
if (nf_logging[pf] == logfn)
nf_logging[pf] = NULL;
nf_logging[pf] = NULL;
spin_unlock(&nf_log_lock);
/* Give time to concurrent readers. */
synchronize_net();
}
}
void nf_log_unregister_logger(struct nf_logger *logger)
{
int i;
spin_lock(&nf_log_lock);
for (i = 0; i < NPROTO; i++) {
if (nf_logging[i] == logger)
nf_logging[i] = NULL;
}
spin_unlock(&nf_log_lock);
synchronize_net();
}
void nf_log_packet(int pf,
unsigned int hooknum,
const struct sk_buff *skb,
const struct net_device *in,
const struct net_device *out,
struct nf_loginfo *loginfo,
const char *fmt, ...)
{
va_list args;
char prefix[NF_LOG_PREFIXLEN];
nf_logfn *logfn;
struct nf_logger *logger;
rcu_read_lock();
logfn = rcu_dereference(nf_logging[pf]);
if (logfn) {
logger = rcu_dereference(nf_logging[pf]);
if (logger) {
va_start(args, fmt);
vsnprintf(prefix, sizeof(prefix), fmt, args);
va_end(args);
/* We must read logging before nf_logfn[pf] */
logfn(hooknum, skb, in, out, prefix);
} else if (!reported) {
printk(KERN_WARNING "nf_log_packet: can\'t log yet, "
"no backend logging module loaded in!\n");
reported++;
logger->logfn(pf, hooknum, skb, in, out, loginfo, prefix);
} else if (net_ratelimit()) {
printk(KERN_WARNING "nf_log_packet: can\'t log since "
"no backend logging module loaded in! Please either "
"load one, or disable logging explicitly\n");
}
rcu_read_unlock();
}
EXPORT_SYMBOL(nf_log_register);
EXPORT_SYMBOL(nf_log_unregister);
EXPORT_SYMBOL(nf_log_unregister_pf);
EXPORT_SYMBOL(nf_log_unregister_logger);
EXPORT_SYMBOL(nf_log_packet);
#ifdef CONFIG_PROC_FS
struct proc_dir_entry *proc_net_netfilter;
EXPORT_SYMBOL(proc_net_netfilter);
static void *seq_start(struct seq_file *seq, loff_t *pos)
{
rcu_read_lock();
if (*pos >= NPROTO)
return NULL;
return pos;
}
static void *seq_next(struct seq_file *s, void *v, loff_t *pos)
{
(*pos)++;
if (*pos >= NPROTO)
return NULL;
return pos;
}
static void seq_stop(struct seq_file *s, void *v)
{
rcu_read_unlock();
}
static int seq_show(struct seq_file *s, void *v)
{
loff_t *pos = v;
const struct nf_logger *logger;
logger = rcu_dereference(nf_logging[*pos]);
if (!logger)
return seq_printf(s, "%2lld NONE\n", *pos);
return seq_printf(s, "%2lld %s\n", *pos, logger->name);
}
static struct seq_operations nflog_seq_ops = {
.start = seq_start,
.next = seq_next,
.stop = seq_stop,
.show = seq_show,
};
static int nflog_open(struct inode *inode, struct file *file)
{
return seq_open(file, &nflog_seq_ops);
}
static struct file_operations nflog_file_ops = {
.owner = THIS_MODULE,
.open = nflog_open,
.read = seq_read,
.llseek = seq_lseek,
.release = seq_release,
};
#endif /* PROC_FS */
/* This does not belong here, but locally generated errors need it if connection
tracking in use: without this, connection may not be in hash table, and hence
manufactured ICMP or RST packets will not be associated with it. */
@ -613,6 +693,9 @@ void nf_ct_attach(struct sk_buff *new, struct sk_buff *skb)
void __init netfilter_init(void)
{
int i, h;
#ifdef CONFIG_PROC_FS
struct proc_dir_entry *pde;
#endif
queue_rerouter = kmalloc(NPROTO * sizeof(struct nf_queue_rerouter),
GFP_KERNEL);
@ -624,6 +707,16 @@ void __init netfilter_init(void)
for (h = 0; h < NF_MAX_HOOKS; h++)
INIT_LIST_HEAD(&nf_hooks[i][h]);
}
#ifdef CONFIG_PROC_FS
proc_net_netfilter = proc_mkdir("netfilter", proc_net);
if (!proc_net_netfilter)
panic("cannot create netfilter proc entry");
pde = create_proc_entry("nf_log", S_IRUGO, proc_net_netfilter);
if (!pde)
panic("cannot create /proc/net/netfilter/nf_log");
pde->proc_fops = &nflog_file_ops;
#endif
}
EXPORT_SYMBOL(ip_ct_attach);

8
net/ipv4/netfilter/ip_conntrack_proto_icmp.c
View File

@ -217,7 +217,7 @@ icmp_error(struct sk_buff *skb, enum ip_conntrack_info *ctinfo,
icmph = skb_header_pointer(skb, skb->nh.iph->ihl*4, sizeof(_ih), &_ih);
if (icmph == NULL) {
if (LOG_INVALID(IPPROTO_ICMP))
nf_log_packet(PF_INET, 0, skb, NULL, NULL,
nf_log_packet(PF_INET, 0, skb, NULL, NULL, NULL,
"ip_ct_icmp: short packet ");
return -NF_ACCEPT;
}
@ -231,13 +231,13 @@ icmp_error(struct sk_buff *skb, enum ip_conntrack_info *ctinfo,
if (!(u16)csum_fold(skb->csum))
break;
if (LOG_INVALID(IPPROTO_ICMP))
nf_log_packet(PF_INET, 0, skb, NULL, NULL,
nf_log_packet(PF_INET, 0, skb, NULL, NULL, NULL,
"ip_ct_icmp: bad HW ICMP checksum ");
return -NF_ACCEPT;
case CHECKSUM_NONE:
if ((u16)csum_fold(skb_checksum(skb, 0, skb->len, 0))) {
if (LOG_INVALID(IPPROTO_ICMP))
nf_log_packet(PF_INET, 0, skb, NULL, NULL,
nf_log_packet(PF_INET, 0, skb, NULL, NULL, NULL,
"ip_ct_icmp: bad ICMP checksum ");
return -NF_ACCEPT;
}
@ -254,7 +254,7 @@ icmp_error(struct sk_buff *skb, enum ip_conntrack_info *ctinfo,
*/
if (icmph->type > NR_ICMP_TYPES) {
if (LOG_INVALID(IPPROTO_ICMP))
nf_log_packet(PF_INET, 0, skb, NULL, NULL,
nf_log_packet(PF_INET, 0, skb, NULL, NULL, NULL,
"ip_ct_icmp: invalid ICMP type ");
return -NF_ACCEPT;
}

21
net/ipv4/netfilter/ip_conntrack_proto_tcp.c
View File

@ -716,7 +716,7 @@ static int tcp_in_window(struct ip_ct_tcp *state,
res = 1;
} else {
if (LOG_INVALID(IPPROTO_TCP))
nf_log_packet(PF_INET, 0, skb, NULL, NULL,
nf_log_packet(PF_INET, 0, skb, NULL, NULL, NULL,
"ip_ct_tcp: %s ",
before(seq, sender->td_maxend + 1) ?
after(end, sender->td_end - receiver->td_maxwin - 1) ?
@ -815,7 +815,7 @@ static int tcp_error(struct sk_buff *skb,
sizeof(_tcph), &_tcph);
if (th == NULL) {
if (LOG_INVALID(IPPROTO_TCP))
nf_log_packet(PF_INET, 0, skb, NULL, NULL,
nf_log_packet(PF_INET, 0, skb, NULL, NULL, NULL,
"ip_ct_tcp: short packet ");
return -NF_ACCEPT;
}
@ -823,7 +823,7 @@ static int tcp_error(struct sk_buff *skb,
/* Not whole TCP header or malformed packet */
if (th->doff*4 < sizeof(struct tcphdr) || tcplen < th->doff*4) {
if (LOG_INVALID(IPPROTO_TCP))
nf_log_packet(PF_INET, 0, skb, NULL, NULL,
nf_log_packet(PF_INET, 0, skb, NULL, NULL, NULL,
"ip_ct_tcp: truncated/malformed packet ");
return -NF_ACCEPT;
}
@ -840,7 +840,7 @@ static int tcp_error(struct sk_buff *skb,
skb->ip_summed == CHECKSUM_HW ? skb->csum
: skb_checksum(skb, iph->ihl*4, tcplen, 0))) {
if (LOG_INVALID(IPPROTO_TCP))
nf_log_packet(PF_INET, 0, skb, NULL, NULL,
nf_log_packet(PF_INET, 0, skb, NULL, NULL, NULL,
"ip_ct_tcp: bad TCP checksum ");
return -NF_ACCEPT;
}
@ -849,7 +849,7 @@ static int tcp_error(struct sk_buff *skb,
tcpflags = (((u_int8_t *)th)[13] & ~(TH_ECE|TH_CWR));
if (!tcp_valid_flags[tcpflags]) {
if (LOG_INVALID(IPPROTO_TCP))
nf_log_packet(PF_INET, 0, skb, NULL, NULL,
nf_log_packet(PF_INET, 0, skb, NULL, NULL, NULL,
"ip_ct_tcp: invalid TCP flag combination ");
return -NF_ACCEPT;
}
@ -897,8 +897,9 @@ static int tcp_packet(struct ip_conntrack *conntrack,
*/
write_unlock_bh(&tcp_lock);
if (LOG_INVALID(IPPROTO_TCP))
nf_log_packet(PF_INET, 0, skb, NULL, NULL,
"ip_ct_tcp: killing out of sync session ");
nf_log_packet(PF_INET, 0, skb, NULL, NULL,
NULL, "ip_ct_tcp: "
"killing out of sync session ");
if (del_timer(&conntrack->timeout))
conntrack->timeout.function((unsigned long)
conntrack);
@ -912,7 +913,7 @@ static int tcp_packet(struct ip_conntrack *conntrack,
write_unlock_bh(&tcp_lock);
if (LOG_INVALID(IPPROTO_TCP))
nf_log_packet(PF_INET, 0, skb, NULL, NULL,
nf_log_packet(PF_INET, 0, skb, NULL, NULL, NULL,
"ip_ct_tcp: invalid packet ignored ");
return NF_ACCEPT;
case TCP_CONNTRACK_MAX:
@ -922,7 +923,7 @@ static int tcp_packet(struct ip_conntrack *conntrack,
old_state);
write_unlock_bh(&tcp_lock);
if (LOG_INVALID(IPPROTO_TCP))
nf_log_packet(PF_INET, 0, skb, NULL, NULL,
nf_log_packet(PF_INET, 0, skb, NULL, NULL, NULL,
"ip_ct_tcp: invalid state ");
return -NF_ACCEPT;
case TCP_CONNTRACK_SYN_SENT:
@ -943,7 +944,7 @@ static int tcp_packet(struct ip_conntrack *conntrack,
write_unlock_bh(&tcp_lock);
if (LOG_INVALID(IPPROTO_TCP))
nf_log_packet(PF_INET, 0, skb, NULL, NULL,
"ip_ct_tcp: invalid SYN");
NULL, "ip_ct_tcp: invalid SYN");
return -NF_ACCEPT;
}
case TCP_CONNTRACK_CLOSE:

6
net/ipv4/netfilter/ip_conntrack_proto_udp.c
View File

@ -98,7 +98,7 @@ static int udp_error(struct sk_buff *skb, enum ip_conntrack_info *ctinfo,
hdr = skb_header_pointer(skb, iph->ihl*4, sizeof(_hdr), &_hdr);
if (hdr == NULL) {
if (LOG_INVALID(IPPROTO_UDP))
nf_log_packet(PF_INET, 0, skb, NULL, NULL,
nf_log_packet(PF_INET, 0, skb, NULL, NULL, NULL,
"ip_ct_udp: short packet ");
return -NF_ACCEPT;
}
@ -106,7 +106,7 @@ static int udp_error(struct sk_buff *skb, enum ip_conntrack_info *ctinfo,
/* Truncated/malformed packets */
if (ntohs(hdr->len) > udplen || ntohs(hdr->len) < sizeof(*hdr)) {
if (LOG_INVALID(IPPROTO_UDP))
nf_log_packet(PF_INET, 0, skb, NULL, NULL,
nf_log_packet(PF_INET, 0, skb, NULL, NULL, NULL,
"ip_ct_udp: truncated/malformed packet ");
return -NF_ACCEPT;
}
@ -126,7 +126,7 @@ static int udp_error(struct sk_buff *skb, enum ip_conntrack_info *ctinfo,
skb->ip_summed == CHECKSUM_HW ? skb->csum
: skb_checksum(skb, iph->ihl*4, udplen, 0))) {
if (LOG_INVALID(IPPROTO_UDP))
nf_log_packet(PF_INET, 0, skb, NULL, NULL,
nf_log_packet(PF_INET, 0, skb, NULL, NULL, NULL,
"ip_ct_udp: bad UDP checksum ");
return -NF_ACCEPT;
}

86
net/ipv4/netfilter/ipt_LOG.c
View File

@ -27,10 +27,6 @@ MODULE_LICENSE("GPL");
MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
MODULE_DESCRIPTION("iptables syslog logging module");
static unsigned int nflog = 1;
module_param(nflog, int, 0400);
MODULE_PARM_DESC(nflog, "register as internal netfilter logging module");
#if 0
#define DEBUGP printk
#else
@ -41,11 +37,17 @@ MODULE_PARM_DESC(nflog, "register as internal netfilter logging module");
static DEFINE_SPINLOCK(log_lock);
/* One level of recursion won't kill us */
static void dump_packet(const struct ipt_log_info *info,
static void dump_packet(const struct nf_loginfo *info,
const struct sk_buff *skb,
unsigned int iphoff)
{
struct iphdr _iph, *ih;
unsigned int logflags;
if (info->type == NF_LOG_TYPE_LOG)
logflags = info->u.log.logflags;
else
logflags = NF_LOG_MASK;
ih = skb_header_pointer(skb, iphoff, sizeof(_iph), &_iph);
if (ih == NULL) {
@ -76,7 +78,7 @@ static void dump_packet(const struct ipt_log_info *info,
if (ntohs(ih->frag_off) & IP_OFFSET)
printk("FRAG:%u ", ntohs(ih->frag_off) & IP_OFFSET);
if ((info->logflags & IPT_LOG_IPOPT)
if ((logflags & IPT_LOG_IPOPT)
&& ih->ihl * 4 > sizeof(struct iphdr)) {
unsigned char _opt[4 * 15 - sizeof(struct iphdr)], *op;
unsigned int i, optsize;
@ -119,7 +121,7 @@ static void dump_packet(const struct ipt_log_info *info,
printk("SPT=%u DPT=%u ",
ntohs(th->source), ntohs(th->dest));
/* Max length: 30 "SEQ=4294967295 ACK=4294967295 " */
if (info->logflags & IPT_LOG_TCPSEQ)
if (logflags & IPT_LOG_TCPSEQ)
printk("SEQ=%u ACK=%u ",
ntohl(th->seq), ntohl(th->ack_seq));
/* Max length: 13 "WINDOW=65535 " */
@ -146,7 +148,7 @@ static void dump_packet(const struct ipt_log_info *info,
/* Max length: 11 "URGP=65535 " */
printk("URGP=%u ", ntohs(th->urg_ptr));
if ((info->logflags & IPT_LOG_TCPOPT)
if ((logflags & IPT_LOG_TCPOPT)
&& th->doff * 4 > sizeof(struct tcphdr)) {
unsigned char _opt[4 * 15 - sizeof(struct tcphdr)];
unsigned char *op;
@ -328,7 +330,7 @@ static void dump_packet(const struct ipt_log_info *info,
}
/* Max length: 15 "UID=4294967295 " */
if ((info->logflags & IPT_LOG_UID) && !iphoff && skb->sk) {
if ((logflags & IPT_LOG_UID) && !iphoff && skb->sk) {
read_lock_bh(&skb->sk->sk_callback_lock);
if (skb->sk->sk_socket && skb->sk->sk_socket->file)
printk("UID=%u ", skb->sk->sk_socket->file->f_uid);
@ -349,19 +351,31 @@ static void dump_packet(const struct ipt_log_info *info,
/* maxlen = 230+ 91 + 230 + 252 = 803 */
}
struct nf_loginfo default_loginfo = {
.type = NF_LOG_TYPE_LOG,
.u = {
.log = {
.level = 0,
.logflags = NF_LOG_MASK,
},
},
};
static void
ipt_log_packet(unsigned int hooknum,
ipt_log_packet(unsigned int pf,
unsigned int hooknum,
const struct sk_buff *skb,
const struct net_device *in,
const struct net_device *out,
const struct ipt_log_info *loginfo,
const char *level_string,
const struct nf_loginfo *loginfo,
const char *prefix)
{
if (!loginfo)
loginfo = &default_loginfo;
spin_lock_bh(&log_lock);
printk(level_string);
printk("%sIN=%s OUT=%s ",
prefix == NULL ? loginfo->prefix : prefix,
printk("<%d>%sIN=%s OUT=%s ", loginfo->u.log.level,
prefix,
in ? in->name : "",
out ? out->name : "");
#ifdef CONFIG_BRIDGE_NETFILTER
@ -405,30 +419,17 @@ ipt_log_target(struct sk_buff **pskb,
void *userinfo)
{
const struct ipt_log_info *loginfo = targinfo;
char level_string[4] = "< >";
struct nf_loginfo li;
level_string[1] = '0' + (loginfo->level % 8);
ipt_log_packet(hooknum, *pskb, in, out, loginfo, level_string, NULL);
li.type = NF_LOG_TYPE_LOG;
li.u.log.level = loginfo->level;
li.u.log.logflags = loginfo->logflags;
nf_log_packet(PF_INET, hooknum, *pskb, in, out, &li, loginfo->prefix);
return IPT_CONTINUE;
}
static void
ipt_logfn(unsigned int hooknum,
const struct sk_buff *skb,
const struct net_device *in,
const struct net_device *out,
const char *prefix)
{
struct ipt_log_info loginfo = {
.level = 0,
.logflags = IPT_LOG_MASK,
.prefix = ""
};
ipt_log_packet(hooknum, skb, in, out, &loginfo, KERN_WARNING, prefix);
}
static int ipt_log_checkentry(const char *tablename,
const struct ipt_entry *e,
void *targinfo,
@ -464,20 +465,29 @@ static struct ipt_target ipt_log_reg = {
.me = THIS_MODULE,
};
static struct nf_logger ipt_log_logger ={
.name = "ipt_LOG",
.logfn = &ipt_log_packet,
.me = THIS_MODULE,
};
static int __init init(void)
{
if (ipt_register_target(&ipt_log_reg))
return -EINVAL;
if (nflog)
nf_log_register(PF_INET, &ipt_logfn);
if (nf_log_register(PF_INET, &ipt_log_logger) < 0) {
printk(KERN_WARNING "ipt_LOG: not logging via system console "
"since somebody else already registered for PF_INET\n");
/* we cannot make module load fail here, since otherwise
* iptables userspace would abort */
}
return 0;
}
static void __exit fini(void)
{
if (nflog)
nf_log_unregister(PF_INET, &ipt_logfn);
nf_log_unregister_logger(&ipt_log_logger);
ipt_unregister_target(&ipt_log_reg);
}

33
net/ipv4/netfilter/ipt_ULOG.c
View File

@ -304,18 +304,27 @@ static unsigned int ipt_ulog_target(struct sk_buff **pskb,
return IPT_CONTINUE;
}
static void ipt_logfn(unsigned int hooknum,
static void ipt_logfn(unsigned int pf,
unsigned int hooknum,
const struct sk_buff *skb,
const struct net_device *in,
const struct net_device *out,
const struct nf_loginfo *li,
const char *prefix)
{
struct ipt_ulog_info loginfo = {
.nl_group = ULOG_DEFAULT_NLGROUP,
.copy_range = 0,
.qthreshold = ULOG_DEFAULT_QTHRESHOLD,
.prefix = ""
};
struct ipt_ulog_info loginfo;
if (!li || li->type != NF_LOG_TYPE_ULOG) {
loginfo.nl_group = ULOG_DEFAULT_NLGROUP;
loginfo.copy_range = 0;
loginfo.qthreshold = ULOG_DEFAULT_QTHRESHOLD;
loginfo.prefix[0] = '\0';
} else {
loginfo.nl_group = li->u.ulog.group;
loginfo.copy_range = li->u.ulog.copy_len;
loginfo.qthreshold = li->u.ulog.qthreshold;
strlcpy(loginfo.prefix, prefix, sizeof(loginfo.prefix));
}
ipt_ulog_packet(hooknum, skb, in, out, &loginfo, prefix);
}
@ -355,6 +364,12 @@ static struct ipt_target ipt_ulog_reg = {
.me = THIS_MODULE,
};
static struct nf_logger ipt_ulog_logger = {
.name = "ipt_ULOG",
.logfn = &ipt_logfn,
.me = THIS_MODULE,
};
static int __init init(void)
{
int i;
@ -382,7 +397,7 @@ static int __init init(void)
return -EINVAL;
}
if (nflog)
nf_log_register(PF_INET, &ipt_logfn);
nf_log_register(PF_INET, &ipt_ulog_logger);
return 0;
}
@ -395,7 +410,7 @@ static void __exit fini(void)
DEBUGP("ipt_ULOG: cleanup_module\n");
if (nflog)
nf_log_unregister(PF_INET, &ipt_logfn);
nf_log_unregister_logger(&ipt_ulog_logger);
ipt_unregister_target(&ipt_ulog_reg);
sock_release(nflognl->sk_socket);

93
net/ipv6/netfilter/ip6t_LOG.c
View File

@ -26,10 +26,6 @@ MODULE_AUTHOR("Jan Rekorajski <baggins@pld.org.pl>");
MODULE_DESCRIPTION("IP6 tables LOG target module");
MODULE_LICENSE("GPL");
static unsigned int nflog = 1;
module_param(nflog, int, 0400);
MODULE_PARM_DESC(nflog, "register as internal netfilter logging module");
struct in_device;
#include <net/route.h>
#include <linux/netfilter_ipv6/ip6t_LOG.h>
@ -44,7 +40,7 @@ struct in_device;
static DEFINE_SPINLOCK(log_lock);
/* One level of recursion won't kill us */
static void dump_packet(const struct ip6t_log_info *info,
static void dump_packet(const struct nf_loginfo *info,
const struct sk_buff *skb, unsigned int ip6hoff,
int recurse)
{
@ -53,6 +49,12 @@ static void dump_packet(const struct ip6t_log_info *info,
struct ipv6hdr _ip6h, *ih;
unsigned int ptr;
unsigned int hdrlen = 0;
unsigned int logflags;
if (info->type == NF_LOG_TYPE_LOG)
logflags = info->u.log.logflags;
else
logflags = NF_LOG_MASK;
ih = skb_header_pointer(skb, ip6hoff, sizeof(_ip6h), &_ip6h);
if (ih == NULL) {
@ -84,7 +86,7 @@ static void dump_packet(const struct ip6t_log_info *info,
}
/* Max length: 48 "OPT (...) " */
if (info->logflags & IP6T_LOG_IPOPT)
if (logflags & IP6T_LOG_IPOPT)
printk("OPT ( ");
switch (currenthdr) {
@ -119,7 +121,7 @@ static void dump_packet(const struct ip6t_log_info *info,
case IPPROTO_ROUTING:
case IPPROTO_HOPOPTS:
if (fragment) {
if (info->logflags & IP6T_LOG_IPOPT)
if (logflags & IP6T_LOG_IPOPT)
printk(")");
return;
}
@ -127,7 +129,7 @@ static void dump_packet(const struct ip6t_log_info *info,
break;
/* Max Length */
case IPPROTO_AH:
if (info->logflags & IP6T_LOG_IPOPT) {
if (logflags & IP6T_LOG_IPOPT) {
struct ip_auth_hdr _ahdr, *ah;
/* Max length: 3 "AH " */
@ -158,7 +160,7 @@ static void dump_packet(const struct ip6t_log_info *info,
hdrlen = (hp->hdrlen+2)<<2;
break;
case IPPROTO_ESP:
if (info->logflags & IP6T_LOG_IPOPT) {
if (logflags & IP6T_LOG_IPOPT) {
struct ip_esp_hdr _esph, *eh;
/* Max length: 4 "ESP " */
@ -190,7 +192,7 @@ static void dump_packet(const struct ip6t_log_info *info,
printk("Unknown Ext Hdr %u", currenthdr);
return;
}
if (info->logflags & IP6T_LOG_IPOPT)
if (logflags & IP6T_LOG_IPOPT)
printk(") ");
currenthdr = hp->nexthdr;
@ -218,7 +220,7 @@ static void dump_packet(const struct ip6t_log_info *info,
printk("SPT=%u DPT=%u ",
ntohs(th->source), ntohs(th->dest));
/* Max length: 30 "SEQ=4294967295 ACK=4294967295 " */
if (info->logflags & IP6T_LOG_TCPSEQ)
if (logflags & IP6T_LOG_TCPSEQ)
printk("SEQ=%u ACK=%u ",
ntohl(th->seq), ntohl(th->ack_seq));
/* Max length: 13 "WINDOW=65535 " */
@ -245,7 +247,7 @@ static void dump_packet(const struct ip6t_log_info *info,
/* Max length: 11 "URGP=65535 " */
printk("URGP=%u ", ntohs(th->urg_ptr));
if ((info->logflags & IP6T_LOG_TCPOPT)
if ((logflags & IP6T_LOG_TCPOPT)
&& th->doff * 4 > sizeof(struct tcphdr)) {
u_int8_t _opt[60 - sizeof(struct tcphdr)], *op;
unsigned int i;
@ -349,7 +351,7 @@ static void dump_packet(const struct ip6t_log_info *info,
}
/* Max length: 15 "UID=4294967295 " */
if ((info->logflags & IP6T_LOG_UID) && recurse && skb->sk) {
if ((logflags & IP6T_LOG_UID) && recurse && skb->sk) {
read_lock_bh(&skb->sk->sk_callback_lock);
if (skb->sk->sk_socket && skb->sk->sk_socket->file)
printk("UID=%u ", skb->sk->sk_socket->file->f_uid);
@ -357,19 +359,31 @@ static void dump_packet(const struct ip6t_log_info *info,
}
}
static struct nf_loginfo default_loginfo = {
.type = NF_LOG_TYPE_LOG,
.u = {
.log = {
.level = 0,
.logflags = NF_LOG_MASK,
},
},
};
static void
ip6t_log_packet(unsigned int hooknum,
ip6t_log_packet(unsigned int pf,
unsigned int hooknum,
const struct sk_buff *skb,
const struct net_device *in,
const struct net_device *out,
const struct ip6t_log_info *loginfo,
const char *level_string,
const struct nf_loginfo *loginfo,
const char *prefix)
{
if (!loginfo)
loginfo = &default_loginfo;
spin_lock_bh(&log_lock);
printk(level_string);
printk("%sIN=%s OUT=%s ",
prefix == NULL ? loginfo->prefix : prefix,
printk("<%d>%sIN=%s OUT=%s ", loginfo->u.log.level,
prefix,
in ? in->name : "",
out ? out->name : "");
if (in && !out) {
@ -416,29 +430,17 @@ ip6t_log_target(struct sk_buff **pskb,
void *userinfo)
{
const struct ip6t_log_info *loginfo = targinfo;
char level_string[4] = "< >";
struct nf_loginfo li;
level_string[1] = '0' + (loginfo->level % 8);
ip6t_log_packet(hooknum, *pskb, in, out, loginfo, level_string, NULL);
li.type = NF_LOG_TYPE_LOG;
li.u.log.level = loginfo->level;
li.u.log.logflags = loginfo->logflags;
nf_log_packet(PF_INET6, hooknum, *pskb, in, out, &li, loginfo->prefix);
return IP6T_CONTINUE;
}
static void
ip6t_logfn(unsigned int hooknum,
const struct sk_buff *skb,
const struct net_device *in,
const struct net_device *out,
const char *prefix)
{
struct ip6t_log_info loginfo = {
.level = 0,
.logflags = IP6T_LOG_MASK,
.prefix = ""
};
ip6t_log_packet(hooknum, skb, in, out, &loginfo, KERN_WARNING, prefix);
}
static int ip6t_log_checkentry(const char *tablename,
const struct ip6t_entry *e,
@ -475,20 +477,29 @@ static struct ip6t_target ip6t_log_reg = {
.me = THIS_MODULE,
};
static struct nf_logger ip6t_logger = {
.name = "ip6t_LOG",
.logfn = &ip6t_log_packet,
.me = THIS_MODULE,
};
static int __init init(void)
{
if (ip6t_register_target(&ip6t_log_reg))
return -EINVAL;
if (nflog)
nf_log_register(PF_INET6, &ip6t_logfn);
if (nf_log_register(PF_INET6, &ip6t_logger) < 0) {
printk(KERN_WARNING "ip6t_LOG: not logging via system console "
"since somebody else already registered for PF_INET6\n");
/* we cannot make module load fail here, since otherwise
* ip6tables userspace would abort */
}
return 0;
}
static void __exit fini(void)
{
if (nflog)
nf_log_unregister(PF_INET6, &ip6t_logfn);
nf_log_unregister_logger(&ip6t_logger);
ip6t_unregister_target(&ip6t_log_reg);
}