5 * Bart De Schuymer <bdschuym@pandora.be>
6 * Harald Welte <laforge@netfilter.org>
11 #include <linux/module.h>
14 #include <linux/if_arp.h>
15 #include <linux/spinlock.h>
16 #include <net/netfilter/nf_log.h>
17 #include <linux/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>
25 static DEFINE_SPINLOCK(ebt_log_lock);
27 static bool ebt_log_tg_check(const struct xt_tgchk_param *par)
29 struct ebt_log_info *info = par->targinfo;
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 ? ' ':':');
62 print_ports(const struct sk_buff *skb, uint8_t protocol, int offset)
64 if (protocol == IPPROTO_TCP ||
65 protocol == IPPROTO_UDP ||
66 protocol == IPPROTO_UDPLITE ||
67 protocol == IPPROTO_SCTP ||
68 protocol == IPPROTO_DCCP) {
69 const struct tcpudphdr *pptr;
70 struct tcpudphdr _ports;
72 pptr = skb_header_pointer(skb, offset,
73 sizeof(_ports), &_ports);
75 printk(" INCOMPLETE TCP/UDP header");
78 printk(" SPT=%u DPT=%u", ntohs(pptr->src), ntohs(pptr->dst));
82 #define myNIPQUAD(a) a[0], a[1], a[2], a[3]
84 ebt_log_packet(u_int8_t pf, unsigned int hooknum,
85 const struct sk_buff *skb, const struct net_device *in,
86 const struct net_device *out, const struct nf_loginfo *loginfo,
91 spin_lock_bh(&ebt_log_lock);
92 printk("<%c>%s IN=%s OUT=%s MAC source = ", '0' + loginfo->u.log.level,
93 prefix, in ? in->name : "", out ? out->name : "");
95 print_MAC(eth_hdr(skb)->h_source);
96 printk("MAC dest = ");
97 print_MAC(eth_hdr(skb)->h_dest);
99 printk("proto = 0x%04x", ntohs(eth_hdr(skb)->h_proto));
101 if (loginfo->type == NF_LOG_TYPE_LOG)
102 bitmask = loginfo->u.log.logflags;
104 bitmask = NF_LOG_MASK;
106 if ((bitmask & EBT_LOG_IP) && eth_hdr(skb)->h_proto ==
108 const struct iphdr *ih;
111 ih = skb_header_pointer(skb, 0, sizeof(_iph), &_iph);
113 printk(" INCOMPLETE IP header");
116 printk(" IP SRC=%u.%u.%u.%u IP DST=%u.%u.%u.%u, IP "
117 "tos=0x%02X, IP proto=%d", NIPQUAD(ih->saddr),
118 NIPQUAD(ih->daddr), ih->tos, ih->protocol);
119 print_ports(skb, ih->protocol, ih->ihl*4);
123 #if defined(CONFIG_BRIDGE_EBT_IP6) || defined(CONFIG_BRIDGE_EBT_IP6_MODULE)
124 if ((bitmask & EBT_LOG_IP6) && eth_hdr(skb)->h_proto ==
126 const struct ipv6hdr *ih;
131 ih = skb_header_pointer(skb, 0, sizeof(_iph), &_iph);
133 printk(" INCOMPLETE IPv6 header");
136 printk(" IPv6 SRC=%pI6 IPv6 DST=%pI6, IPv6 priority=0x%01X, Next Header=%d",
137 &ih->saddr, &ih->daddr, ih->priority, ih->nexthdr);
138 nexthdr = ih->nexthdr;
139 offset_ph = ipv6_skip_exthdr(skb, sizeof(_iph), &nexthdr);
142 print_ports(skb, nexthdr, offset_ph);
147 if ((bitmask & EBT_LOG_ARP) &&
148 ((eth_hdr(skb)->h_proto == htons(ETH_P_ARP)) ||
149 (eth_hdr(skb)->h_proto == htons(ETH_P_RARP)))) {
150 const struct arphdr *ah;
153 ah = skb_header_pointer(skb, 0, sizeof(_arph), &_arph);
155 printk(" INCOMPLETE ARP header");
158 printk(" ARP HTYPE=%d, PTYPE=0x%04x, OPCODE=%d",
159 ntohs(ah->ar_hrd), ntohs(ah->ar_pro),
162 /* If it's for Ethernet and the lengths are OK,
163 * then log the ARP payload */
164 if (ah->ar_hrd == htons(1) &&
165 ah->ar_hln == ETH_ALEN &&
166 ah->ar_pln == sizeof(__be32)) {
167 const struct arppayload *ap;
168 struct arppayload _arpp;
170 ap = skb_header_pointer(skb, sizeof(_arph),
171 sizeof(_arpp), &_arpp);
173 printk(" INCOMPLETE ARP payload");
176 printk(" ARP MAC SRC=");
177 print_MAC(ap->mac_src);
178 printk(" ARP IP SRC=%u.%u.%u.%u",
179 myNIPQUAD(ap->ip_src));
180 printk(" ARP MAC DST=");
181 print_MAC(ap->mac_dst);
182 printk(" ARP IP DST=%u.%u.%u.%u",
183 myNIPQUAD(ap->ip_dst));
188 spin_unlock_bh(&ebt_log_lock);
193 ebt_log_tg(struct sk_buff *skb, const struct xt_target_param *par)
195 const struct ebt_log_info *info = par->targinfo;
196 struct nf_loginfo li;
198 li.type = NF_LOG_TYPE_LOG;
199 li.u.log.level = info->loglevel;
200 li.u.log.logflags = info->bitmask;
202 if (info->bitmask & EBT_LOG_NFLOG)
203 nf_log_packet(NFPROTO_BRIDGE, par->hooknum, skb, par->in,
204 par->out, &li, "%s", info->prefix);
206 ebt_log_packet(NFPROTO_BRIDGE, par->hooknum, skb, par->in,
207 par->out, &li, info->prefix);
211 static struct xt_target ebt_log_tg_reg __read_mostly = {
214 .family = NFPROTO_BRIDGE,
215 .target = ebt_log_tg,
216 .checkentry = ebt_log_tg_check,
217 .targetsize = XT_ALIGN(sizeof(struct ebt_log_info)),
221 static const struct nf_logger ebt_log_logger = {
223 .logfn = &ebt_log_packet,
227 static int __init ebt_log_init(void)
231 ret = xt_register_target(&ebt_log_tg_reg);
234 nf_log_register(NFPROTO_BRIDGE, &ebt_log_logger);
238 static void __exit ebt_log_fini(void)
240 nf_log_unregister(&ebt_log_logger);
241 xt_unregister_target(&ebt_log_tg_reg);
244 module_init(ebt_log_init);
245 module_exit(ebt_log_fini);
246 MODULE_DESCRIPTION("Ebtables: Packet logging to syslog");
247 MODULE_LICENSE("GPL");