5 * Bart De Schuymer <bdschuym@pandora.be>
6 * Harald Welte <laforge@netfilter.org>
12 #include <linux/netfilter_bridge/ebtables.h>
13 #include <linux/netfilter_bridge/ebt_log.h>
14 #include <linux/netfilter.h>
15 #include <linux/module.h>
18 #include <linux/if_arp.h>
19 #include <linux/spinlock.h>
20 #include <net/netfilter/nf_log.h>
22 static DEFINE_SPINLOCK(ebt_log_lock
);
24 static int ebt_log_check(const char *tablename
, unsigned int hookmask
,
25 const struct ebt_entry
*e
, void *data
, unsigned int datalen
)
27 struct ebt_log_info
*info
= data
;
29 if (datalen
!= EBT_ALIGN(sizeof(struct ebt_log_info
)))
31 if (info
->bitmask
& ~EBT_LOG_MASK
)
33 if (info
->loglevel
>= 8)
35 info
->prefix
[EBT_LOG_PREFIX_SIZE
- 1] = '\0';
47 unsigned char mac_src
[ETH_ALEN
];
48 unsigned char ip_src
[4];
49 unsigned char mac_dst
[ETH_ALEN
];
50 unsigned char ip_dst
[4];
53 static void print_MAC(const unsigned char *p
)
57 for (i
= 0; i
< ETH_ALEN
; i
++, p
++)
58 printk("%02x%c", *p
, i
== ETH_ALEN
- 1 ? ' ':':');
61 #define myNIPQUAD(a) a[0], a[1], a[2], a[3]
63 ebt_log_packet(unsigned int pf
, unsigned int hooknum
,
64 const struct sk_buff
*skb
, const struct net_device
*in
,
65 const struct net_device
*out
, const struct nf_loginfo
*loginfo
,
70 spin_lock_bh(&ebt_log_lock
);
71 printk("<%c>%s IN=%s OUT=%s MAC source = ", '0' + loginfo
->u
.log
.level
,
72 prefix
, in
? in
->name
: "", out
? out
->name
: "");
74 print_MAC(eth_hdr(skb
)->h_source
);
75 printk("MAC dest = ");
76 print_MAC(eth_hdr(skb
)->h_dest
);
78 printk("proto = 0x%04x", ntohs(eth_hdr(skb
)->h_proto
));
80 if (loginfo
->type
== NF_LOG_TYPE_LOG
)
81 bitmask
= loginfo
->u
.log
.logflags
;
83 bitmask
= NF_LOG_MASK
;
85 if ((bitmask
& EBT_LOG_IP
) && eth_hdr(skb
)->h_proto
==
87 const struct iphdr
*ih
;
90 ih
= skb_header_pointer(skb
, 0, sizeof(_iph
), &_iph
);
92 printk(" INCOMPLETE IP header");
95 printk(" IP SRC=%u.%u.%u.%u IP DST=%u.%u.%u.%u, IP "
96 "tos=0x%02X, IP proto=%d", NIPQUAD(ih
->saddr
),
97 NIPQUAD(ih
->daddr
), ih
->tos
, ih
->protocol
);
98 if (ih
->protocol
== IPPROTO_TCP
||
99 ih
->protocol
== IPPROTO_UDP
||
100 ih
->protocol
== IPPROTO_UDPLITE
||
101 ih
->protocol
== IPPROTO_SCTP
||
102 ih
->protocol
== IPPROTO_DCCP
) {
103 const struct tcpudphdr
*pptr
;
104 struct tcpudphdr _ports
;
106 pptr
= skb_header_pointer(skb
, ih
->ihl
*4,
107 sizeof(_ports
), &_ports
);
109 printk(" INCOMPLETE TCP/UDP header");
112 printk(" SPT=%u DPT=%u", ntohs(pptr
->src
),
118 if ((bitmask
& EBT_LOG_ARP
) &&
119 ((eth_hdr(skb
)->h_proto
== htons(ETH_P_ARP
)) ||
120 (eth_hdr(skb
)->h_proto
== htons(ETH_P_RARP
)))) {
121 const struct arphdr
*ah
;
124 ah
= skb_header_pointer(skb
, 0, sizeof(_arph
), &_arph
);
126 printk(" INCOMPLETE ARP header");
129 printk(" ARP HTYPE=%d, PTYPE=0x%04x, OPCODE=%d",
130 ntohs(ah
->ar_hrd
), ntohs(ah
->ar_pro
),
133 /* If it's for Ethernet and the lengths are OK,
134 * then log the ARP payload */
135 if (ah
->ar_hrd
== htons(1) &&
136 ah
->ar_hln
== ETH_ALEN
&&
137 ah
->ar_pln
== sizeof(__be32
)) {
138 const struct arppayload
*ap
;
139 struct arppayload _arpp
;
141 ap
= skb_header_pointer(skb
, sizeof(_arph
),
142 sizeof(_arpp
), &_arpp
);
144 printk(" INCOMPLETE ARP payload");
147 printk(" ARP MAC SRC=");
148 print_MAC(ap
->mac_src
);
149 printk(" ARP IP SRC=%u.%u.%u.%u",
150 myNIPQUAD(ap
->ip_src
));
151 printk(" ARP MAC DST=");
152 print_MAC(ap
->mac_dst
);
153 printk(" ARP IP DST=%u.%u.%u.%u",
154 myNIPQUAD(ap
->ip_dst
));
159 spin_unlock_bh(&ebt_log_lock
);
163 static void ebt_log(const struct sk_buff
*skb
, unsigned int hooknr
,
164 const struct net_device
*in
, const struct net_device
*out
,
165 const void *data
, unsigned int datalen
)
167 const struct ebt_log_info
*info
= data
;
168 struct nf_loginfo li
;
170 li
.type
= NF_LOG_TYPE_LOG
;
171 li
.u
.log
.level
= info
->loglevel
;
172 li
.u
.log
.logflags
= info
->bitmask
;
174 if (info
->bitmask
& EBT_LOG_NFLOG
)
175 nf_log_packet(PF_BRIDGE
, hooknr
, skb
, in
, out
, &li
,
178 ebt_log_packet(PF_BRIDGE
, hooknr
, skb
, in
, out
, &li
,
182 static struct ebt_watcher log
=
184 .name
= EBT_LOG_WATCHER
,
186 .check
= ebt_log_check
,
190 static const struct nf_logger ebt_log_logger
= {
192 .logfn
= &ebt_log_packet
,
196 static int __init
ebt_log_init(void)
200 ret
= ebt_register_watcher(&log
);
203 nf_log_register(PF_BRIDGE
, &ebt_log_logger
);
207 static void __exit
ebt_log_fini(void)
209 nf_log_unregister(&ebt_log_logger
);
210 ebt_unregister_watcher(&log
);
213 module_init(ebt_log_init
);
214 module_exit(ebt_log_fini
);
215 MODULE_DESCRIPTION("Ebtables: Packet logging to syslog");
216 MODULE_LICENSE("GPL");