netfilter: ebtables: Use %pM conversion specifier
[linux-2.6.git] / net / bridge / netfilter / ebt_log.c
1 /*
2  *  ebt_log
3  *
4  *      Authors:
5  *      Bart De Schuymer <bdschuym@pandora.be>
6  *      Harald Welte <laforge@netfilter.org>
7  *
8  *  April, 2002
9  *
10  */
11 #include <linux/module.h>
12 #include <linux/ip.h>
13 #include <linux/in.h>
14 #include <linux/if_arp.h>
15 #include <linux/spinlock.h>
16 #include <net/netfilter/nf_log.h>
17 #include <linux/ipv6.h>
18 #include <net/ipv6.h>
19 #include <linux/in6.h>
20 #include <linux/netfilter/x_tables.h>
21 #include <linux/netfilter_bridge/ebtables.h>
22 #include <linux/netfilter_bridge/ebt_log.h>
23 #include <linux/netfilter.h>
24
25 static DEFINE_SPINLOCK(ebt_log_lock);
26
27 static bool ebt_log_tg_check(const struct xt_tgchk_param *par)
28 {
29         struct ebt_log_info *info = par->targinfo;
30
31         if (info->bitmask & ~EBT_LOG_MASK)
32                 return false;
33         if (info->loglevel >= 8)
34                 return false;
35         info->prefix[EBT_LOG_PREFIX_SIZE - 1] = '\0';
36         return true;
37 }
38
39 struct tcpudphdr
40 {
41         __be16 src;
42         __be16 dst;
43 };
44
45 struct arppayload
46 {
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];
51 };
52
53 static void
54 print_ports(const struct sk_buff *skb, uint8_t protocol, int offset)
55 {
56         if (protocol == IPPROTO_TCP ||
57             protocol == IPPROTO_UDP ||
58             protocol == IPPROTO_UDPLITE ||
59             protocol == IPPROTO_SCTP ||
60             protocol == IPPROTO_DCCP) {
61                 const struct tcpudphdr *pptr;
62                 struct tcpudphdr _ports;
63
64                 pptr = skb_header_pointer(skb, offset,
65                                           sizeof(_ports), &_ports);
66                 if (pptr == NULL) {
67                         printk(" INCOMPLETE TCP/UDP header");
68                         return;
69                 }
70                 printk(" SPT=%u DPT=%u", ntohs(pptr->src), ntohs(pptr->dst));
71         }
72 }
73
74 static void
75 ebt_log_packet(u_int8_t pf, unsigned int hooknum,
76    const struct sk_buff *skb, const struct net_device *in,
77    const struct net_device *out, const struct nf_loginfo *loginfo,
78    const char *prefix)
79 {
80         unsigned int bitmask;
81
82         spin_lock_bh(&ebt_log_lock);
83         printk("<%c>%s IN=%s OUT=%s MAC source = %pM MAC dest = %pM proto = 0x%04x",
84                '0' + loginfo->u.log.level, prefix,
85                in ? in->name : "", out ? out->name : "",
86                eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
87                ntohs(eth_hdr(skb)->h_proto));
88
89         if (loginfo->type == NF_LOG_TYPE_LOG)
90                 bitmask = loginfo->u.log.logflags;
91         else
92                 bitmask = NF_LOG_MASK;
93
94         if ((bitmask & EBT_LOG_IP) && eth_hdr(skb)->h_proto ==
95            htons(ETH_P_IP)){
96                 const struct iphdr *ih;
97                 struct iphdr _iph;
98
99                 ih = skb_header_pointer(skb, 0, sizeof(_iph), &_iph);
100                 if (ih == NULL) {
101                         printk(" INCOMPLETE IP header");
102                         goto out;
103                 }
104                 printk(" IP SRC=%pI4 IP DST=%pI4, IP tos=0x%02X, IP proto=%d",
105                        &ih->saddr, &ih->daddr, ih->tos, ih->protocol);
106                 print_ports(skb, ih->protocol, ih->ihl*4);
107                 goto out;
108         }
109
110 #if defined(CONFIG_BRIDGE_EBT_IP6) || defined(CONFIG_BRIDGE_EBT_IP6_MODULE)
111         if ((bitmask & EBT_LOG_IP6) && eth_hdr(skb)->h_proto ==
112            htons(ETH_P_IPV6)) {
113                 const struct ipv6hdr *ih;
114                 struct ipv6hdr _iph;
115                 uint8_t nexthdr;
116                 int offset_ph;
117
118                 ih = skb_header_pointer(skb, 0, sizeof(_iph), &_iph);
119                 if (ih == NULL) {
120                         printk(" INCOMPLETE IPv6 header");
121                         goto out;
122                 }
123                 printk(" IPv6 SRC=%pI6 IPv6 DST=%pI6, IPv6 priority=0x%01X, Next Header=%d",
124                        &ih->saddr, &ih->daddr, ih->priority, ih->nexthdr);
125                 nexthdr = ih->nexthdr;
126                 offset_ph = ipv6_skip_exthdr(skb, sizeof(_iph), &nexthdr);
127                 if (offset_ph == -1)
128                         goto out;
129                 print_ports(skb, nexthdr, offset_ph);
130                 goto out;
131         }
132 #endif
133
134         if ((bitmask & EBT_LOG_ARP) &&
135             ((eth_hdr(skb)->h_proto == htons(ETH_P_ARP)) ||
136              (eth_hdr(skb)->h_proto == htons(ETH_P_RARP)))) {
137                 const struct arphdr *ah;
138                 struct arphdr _arph;
139
140                 ah = skb_header_pointer(skb, 0, sizeof(_arph), &_arph);
141                 if (ah == NULL) {
142                         printk(" INCOMPLETE ARP header");
143                         goto out;
144                 }
145                 printk(" ARP HTYPE=%d, PTYPE=0x%04x, OPCODE=%d",
146                        ntohs(ah->ar_hrd), ntohs(ah->ar_pro),
147                        ntohs(ah->ar_op));
148
149                 /* If it's for Ethernet and the lengths are OK,
150                  * then log the ARP payload */
151                 if (ah->ar_hrd == htons(1) &&
152                     ah->ar_hln == ETH_ALEN &&
153                     ah->ar_pln == sizeof(__be32)) {
154                         const struct arppayload *ap;
155                         struct arppayload _arpp;
156
157                         ap = skb_header_pointer(skb, sizeof(_arph),
158                                                 sizeof(_arpp), &_arpp);
159                         if (ap == NULL) {
160                                 printk(" INCOMPLETE ARP payload");
161                                 goto out;
162                         }
163                         printk(" ARP MAC SRC=%pM ARP IP SRC=%pI4 ARP MAC DST=%pM ARP IP DST=%pI4",
164                                         ap->mac_src, ap->ip_src, ap->mac_dst, ap->ip_dst);
165                 }
166         }
167 out:
168         printk("\n");
169         spin_unlock_bh(&ebt_log_lock);
170
171 }
172
173 static unsigned int
174 ebt_log_tg(struct sk_buff *skb, const struct xt_target_param *par)
175 {
176         const struct ebt_log_info *info = par->targinfo;
177         struct nf_loginfo li;
178
179         li.type = NF_LOG_TYPE_LOG;
180         li.u.log.level = info->loglevel;
181         li.u.log.logflags = info->bitmask;
182
183         if (info->bitmask & EBT_LOG_NFLOG)
184                 nf_log_packet(NFPROTO_BRIDGE, par->hooknum, skb, par->in,
185                               par->out, &li, "%s", info->prefix);
186         else
187                 ebt_log_packet(NFPROTO_BRIDGE, par->hooknum, skb, par->in,
188                                par->out, &li, info->prefix);
189         return EBT_CONTINUE;
190 }
191
192 static struct xt_target ebt_log_tg_reg __read_mostly = {
193         .name           = "log",
194         .revision       = 0,
195         .family         = NFPROTO_BRIDGE,
196         .target         = ebt_log_tg,
197         .checkentry     = ebt_log_tg_check,
198         .targetsize     = XT_ALIGN(sizeof(struct ebt_log_info)),
199         .me             = THIS_MODULE,
200 };
201
202 static struct nf_logger ebt_log_logger __read_mostly = {
203         .name           = "ebt_log",
204         .logfn          = &ebt_log_packet,
205         .me             = THIS_MODULE,
206 };
207
208 static int __init ebt_log_init(void)
209 {
210         int ret;
211
212         ret = xt_register_target(&ebt_log_tg_reg);
213         if (ret < 0)
214                 return ret;
215         nf_log_register(NFPROTO_BRIDGE, &ebt_log_logger);
216         return 0;
217 }
218
219 static void __exit ebt_log_fini(void)
220 {
221         nf_log_unregister(&ebt_log_logger);
222         xt_unregister_target(&ebt_log_tg_reg);
223 }
224
225 module_init(ebt_log_init);
226 module_exit(ebt_log_fini);
227 MODULE_DESCRIPTION("Ebtables: Packet logging to syslog");
228 MODULE_LICENSE("GPL");