[NETFILTER]: nf_nat: pass manip type instead of hook to nf_nat_setup_info
[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
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>
16 #include <linux/ip.h>
17 #include <linux/in.h>
18 #include <linux/if_arp.h>
19 #include <linux/spinlock.h>
20
21 static DEFINE_SPINLOCK(ebt_log_lock);
22
23 static int ebt_log_check(const char *tablename, unsigned int hookmask,
24    const struct ebt_entry *e, void *data, unsigned int datalen)
25 {
26         struct ebt_log_info *info = (struct ebt_log_info *)data;
27
28         if (datalen != EBT_ALIGN(sizeof(struct ebt_log_info)))
29                 return -EINVAL;
30         if (info->bitmask & ~EBT_LOG_MASK)
31                 return -EINVAL;
32         if (info->loglevel >= 8)
33                 return -EINVAL;
34         info->prefix[EBT_LOG_PREFIX_SIZE - 1] = '\0';
35         return 0;
36 }
37
38 struct tcpudphdr
39 {
40         __be16 src;
41         __be16 dst;
42 };
43
44 struct arppayload
45 {
46         unsigned char mac_src[ETH_ALEN];
47         unsigned char ip_src[4];
48         unsigned char mac_dst[ETH_ALEN];
49         unsigned char ip_dst[4];
50 };
51
52 static void print_MAC(unsigned char *p)
53 {
54         int i;
55
56         for (i = 0; i < ETH_ALEN; i++, p++)
57                 printk("%02x%c", *p, i == ETH_ALEN - 1 ? ' ':':');
58 }
59
60 #define myNIPQUAD(a) a[0], a[1], a[2], a[3]
61 static void
62 ebt_log_packet(unsigned int pf, unsigned int hooknum,
63    const struct sk_buff *skb, const struct net_device *in,
64    const struct net_device *out, const struct nf_loginfo *loginfo,
65    const char *prefix)
66 {
67         unsigned int bitmask;
68
69         spin_lock_bh(&ebt_log_lock);
70         printk("<%c>%s IN=%s OUT=%s MAC source = ", '0' + loginfo->u.log.level,
71                prefix, in ? in->name : "", out ? out->name : "");
72
73         print_MAC(eth_hdr(skb)->h_source);
74         printk("MAC dest = ");
75         print_MAC(eth_hdr(skb)->h_dest);
76
77         printk("proto = 0x%04x", ntohs(eth_hdr(skb)->h_proto));
78
79         if (loginfo->type == NF_LOG_TYPE_LOG)
80                 bitmask = loginfo->u.log.logflags;
81         else
82                 bitmask = NF_LOG_MASK;
83
84         if ((bitmask & EBT_LOG_IP) && eth_hdr(skb)->h_proto ==
85            htons(ETH_P_IP)){
86                 struct iphdr _iph, *ih;
87
88                 ih = skb_header_pointer(skb, 0, sizeof(_iph), &_iph);
89                 if (ih == NULL) {
90                         printk(" INCOMPLETE IP header");
91                         goto out;
92                 }
93                 printk(" IP SRC=%u.%u.%u.%u IP DST=%u.%u.%u.%u, IP "
94                        "tos=0x%02X, IP proto=%d", NIPQUAD(ih->saddr),
95                        NIPQUAD(ih->daddr), ih->tos, ih->protocol);
96                 if (ih->protocol == IPPROTO_TCP ||
97                     ih->protocol == IPPROTO_UDP ||
98                     ih->protocol == IPPROTO_UDPLITE ||
99                     ih->protocol == IPPROTO_SCTP ||
100                     ih->protocol == IPPROTO_DCCP) {
101                         struct tcpudphdr _ports, *pptr;
102
103                         pptr = skb_header_pointer(skb, ih->ihl*4,
104                                                   sizeof(_ports), &_ports);
105                         if (pptr == NULL) {
106                                 printk(" INCOMPLETE TCP/UDP header");
107                                 goto out;
108                         }
109                         printk(" SPT=%u DPT=%u", ntohs(pptr->src),
110                            ntohs(pptr->dst));
111                 }
112                 goto out;
113         }
114
115         if ((bitmask & EBT_LOG_ARP) &&
116             ((eth_hdr(skb)->h_proto == htons(ETH_P_ARP)) ||
117              (eth_hdr(skb)->h_proto == htons(ETH_P_RARP)))) {
118                 struct arphdr _arph, *ah;
119
120                 ah = skb_header_pointer(skb, 0, sizeof(_arph), &_arph);
121                 if (ah == NULL) {
122                         printk(" INCOMPLETE ARP header");
123                         goto out;
124                 }
125                 printk(" ARP HTYPE=%d, PTYPE=0x%04x, OPCODE=%d",
126                        ntohs(ah->ar_hrd), ntohs(ah->ar_pro),
127                        ntohs(ah->ar_op));
128
129                 /* If it's for Ethernet and the lengths are OK,
130                  * then log the ARP payload */
131                 if (ah->ar_hrd == htons(1) &&
132                     ah->ar_hln == ETH_ALEN &&
133                     ah->ar_pln == sizeof(__be32)) {
134                         struct arppayload _arpp, *ap;
135
136                         ap = skb_header_pointer(skb, sizeof(_arph),
137                                                 sizeof(_arpp), &_arpp);
138                         if (ap == NULL) {
139                                 printk(" INCOMPLETE ARP payload");
140                                 goto out;
141                         }
142                         printk(" ARP MAC SRC=");
143                         print_MAC(ap->mac_src);
144                         printk(" ARP IP SRC=%u.%u.%u.%u",
145                                myNIPQUAD(ap->ip_src));
146                         printk(" ARP MAC DST=");
147                         print_MAC(ap->mac_dst);
148                         printk(" ARP IP DST=%u.%u.%u.%u",
149                                myNIPQUAD(ap->ip_dst));
150                 }
151         }
152 out:
153         printk("\n");
154         spin_unlock_bh(&ebt_log_lock);
155
156 }
157
158 static void ebt_log(const struct sk_buff *skb, unsigned int hooknr,
159    const struct net_device *in, const struct net_device *out,
160    const void *data, unsigned int datalen)
161 {
162         struct ebt_log_info *info = (struct ebt_log_info *)data;
163         struct nf_loginfo li;
164
165         li.type = NF_LOG_TYPE_LOG;
166         li.u.log.level = info->loglevel;
167         li.u.log.logflags = info->bitmask;
168
169         if (info->bitmask & EBT_LOG_NFLOG)
170                 nf_log_packet(PF_BRIDGE, hooknr, skb, in, out, &li,
171                               "%s", info->prefix);
172         else
173                 ebt_log_packet(PF_BRIDGE, hooknr, skb, in, out, &li,
174                                info->prefix);
175 }
176
177 static struct ebt_watcher log =
178 {
179         .name           = EBT_LOG_WATCHER,
180         .watcher        = ebt_log,
181         .check          = ebt_log_check,
182         .me             = THIS_MODULE,
183 };
184
185 static struct nf_logger ebt_log_logger = {
186         .name           = "ebt_log",
187         .logfn          = &ebt_log_packet,
188         .me             = THIS_MODULE,
189 };
190
191 static int __init ebt_log_init(void)
192 {
193         int ret;
194
195         ret = ebt_register_watcher(&log);
196         if (ret < 0)
197                 return ret;
198         nf_log_register(PF_BRIDGE, &ebt_log_logger);
199         return 0;
200 }
201
202 static void __exit ebt_log_fini(void)
203 {
204         nf_log_unregister(&ebt_log_logger);
205         ebt_unregister_watcher(&log);
206 }
207
208 module_init(ebt_log_init);
209 module_exit(ebt_log_fini);
210 MODULE_LICENSE("GPL");