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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/in.h> | |
13 | #include <linux/netfilter_bridge/ebtables.h> | |
14 | #include <linux/netfilter_bridge/ebt_log.h> | |
15 | #include <linux/netfilter.h> | |
16 | #include <linux/module.h> | |
17 | #include <linux/ip.h> | |
18 | #include <linux/in.h> | |
19 | #include <linux/if_arp.h> | |
20 | #include <linux/spinlock.h> | |
21 | ||
22 | static DEFINE_SPINLOCK(ebt_log_lock); | |
23 | ||
24 | static int ebt_log_check(const char *tablename, unsigned int hookmask, | |
25 | const struct ebt_entry *e, void *data, unsigned int datalen) | |
26 | { | |
27 | struct ebt_log_info *info = (struct ebt_log_info *)data; | |
28 | ||
29 | if (datalen != EBT_ALIGN(sizeof(struct ebt_log_info))) | |
30 | return -EINVAL; | |
31 | if (info->bitmask & ~EBT_LOG_MASK) | |
32 | return -EINVAL; | |
33 | if (info->loglevel >= 8) | |
34 | return -EINVAL; | |
35 | info->prefix[EBT_LOG_PREFIX_SIZE - 1] = '\0'; | |
36 | return 0; | |
37 | } | |
38 | ||
39 | struct tcpudphdr | |
40 | { | |
41 | uint16_t src; | |
42 | uint16_t 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 print_MAC(unsigned char *p) | |
54 | { | |
55 | int i; | |
56 | ||
57 | for (i = 0; i < ETH_ALEN; i++, p++) | |
58 | printk("%02x%c", *p, i == ETH_ALEN - 1 ? ' ':':'); | |
59 | } | |
60 | ||
61 | #define myNIPQUAD(a) a[0], a[1], a[2], a[3] | |
62 | static void | |
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, | |
66 | const char *prefix) | |
67 | { | |
68 | unsigned int bitmask; | |
69 | ||
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 : ""); | |
73 | ||
74 | print_MAC(eth_hdr(skb)->h_source); | |
75 | printk("MAC dest = "); | |
76 | print_MAC(eth_hdr(skb)->h_dest); | |
77 | ||
78 | printk("proto = 0x%04x", ntohs(eth_hdr(skb)->h_proto)); | |
79 | ||
80 | if (loginfo->type == NF_LOG_TYPE_LOG) | |
81 | bitmask = loginfo->u.log.logflags; | |
82 | else | |
83 | bitmask = NF_LOG_MASK; | |
84 | ||
85 | if ((bitmask & EBT_LOG_IP) && eth_hdr(skb)->h_proto == | |
86 | htons(ETH_P_IP)){ | |
87 | struct iphdr _iph, *ih; | |
88 | ||
89 | ih = skb_header_pointer(skb, 0, sizeof(_iph), &_iph); | |
90 | if (ih == NULL) { | |
91 | printk(" INCOMPLETE IP header"); | |
92 | goto out; | |
93 | } | |
94 | printk(" IP SRC=%u.%u.%u.%u IP DST=%u.%u.%u.%u, IP " | |
95 | "tos=0x%02X, IP proto=%d", NIPQUAD(ih->saddr), | |
96 | NIPQUAD(ih->daddr), ih->tos, ih->protocol); | |
97 | if (ih->protocol == IPPROTO_TCP || | |
98 | ih->protocol == IPPROTO_UDP || | |
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(uint32_t)) { | |
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 | 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 | if (nf_log_register(PF_BRIDGE, &ebt_log_logger) < 0) { | |
199 | printk(KERN_WARNING "ebt_log: not logging via system console " | |
200 | "since somebody else already registered for PF_INET\n"); | |
201 | /* we cannot make module load fail here, since otherwise | |
202 | * ebtables userspace would abort */ | |
203 | } | |
204 | ||
205 | return 0; | |
206 | } | |
207 | ||
208 | static void __exit ebt_log_fini(void) | |
209 | { | |
210 | nf_log_unregister_logger(&ebt_log_logger); | |
211 | ebt_unregister_watcher(&log); | |
212 | } | |
213 | ||
214 | module_init(ebt_log_init); | |
215 | module_exit(ebt_log_fini); | |
216 | MODULE_LICENSE("GPL"); |