1 files changed, 111 insertions, 0 deletions
diff --git a/kernel/linux/net/bridge/netfilter/ebt_log.c b/kernel/linux/net/bridge/netfilter/ebt_log.c
new file mode 100644
index 0000000..e7f0506
--- /dev/null
+++ b/kernel/linux/net/bridge/netfilter/ebt_log.c
@@ -0,0 +1,111 @@
+/*
+ *  ebt_log
+ *
+ *	Authors:
+ *	Bart De Schuymer <bart.de.schuymer@pandora.be>
+ *
+ *  April, 2002
+ *
+ */
+
+#include <linux/netfilter_bridge/ebtables.h>
+#include <linux/netfilter_bridge/ebt_log.h>
+#include <linux/module.h>
+#include <linux/ip.h>
+#include <linux/if_arp.h>
+#include <linux/spinlock.h>
+
+static spinlock_t ebt_log_lock = SPIN_LOCK_UNLOCKED;
+
+static int ebt_log_check(const char *tablename, unsigned int hooknr,
+   const struct ebt_entry *e, void *data, unsigned int datalen)
+{
+	struct ebt_log_info *loginfo = (struct ebt_log_info *)data;
+
+	if (datalen != sizeof(struct ebt_log_info))
+		return -EINVAL;
+	if (loginfo->bitmask & ~EBT_LOG_MASK)
+		return -EINVAL;
+	if (loginfo->loglevel >= 8)
+		return -EINVAL;
+	loginfo->prefix[EBT_LOG_PREFIX_SIZE - 1] = '\0';
+	return 0;
+}
+
+static void ebt_log(const struct sk_buff *skb, const struct net_device *in,
+   const struct net_device *out, const void *data, unsigned int datalen,
+   const struct ebt_counter *c)
+{
+	struct ebt_log_info *loginfo = (struct ebt_log_info *)data;
+	char level_string[4] = "< >";
+	level_string[1] = '0' + loginfo->loglevel;
+
+	spin_lock_bh(&ebt_log_lock);
+	printk(level_string);
+	// max length: 29 + 10 + 2 * 16
+	printk("%s IN=%s OUT=%s ",
+	       loginfo->prefix,
+	       in ? in->name : "",
+	       out ? out->name : "");
+
+	if (skb->dev->hard_header_len) {
+		int i;
+		unsigned char *p = (skb->mac.ethernet)->h_source;
+		printk("MAC source = ");
+		for (i = 0; i < ETH_ALEN; i++,p++)
+			printk("%02x%c", *p,
+			       i == ETH_ALEN - 1
+			       ? ' ':':');// length: 31
+		printk("MAC dest = ");
+		p = (skb->mac.ethernet)->h_dest;
+		for (i = 0; i < ETH_ALEN; i++,p++)
+			printk("%02x%c", *p,
+			       i == ETH_ALEN - 1
+			       ? ' ':':');// length: 29
+	}
+	// length: 14
+	printk("proto = 0x%04x", ntohs(((*skb).mac.ethernet)->h_proto));
+
+	if ((loginfo->bitmask & EBT_LOG_IP) && skb->mac.ethernet->h_proto ==
+	   htons(ETH_P_IP)){
+		struct iphdr *iph = skb->nh.iph;
+		// max length: 46
+		printk(" IP SRC=%u.%u.%u.%u IP DST=%u.%u.%u.%u,",
+		   NIPQUAD(iph->saddr), NIPQUAD(iph->daddr));
+		// max length: 26
+		printk(" IP tos=0x%02X, IP proto=%d", iph->tos, iph->protocol);
+	}
+
+	if ((loginfo->bitmask & EBT_LOG_ARP) &&
+	    ((skb->mac.ethernet->h_proto == __constant_htons(ETH_P_ARP)) ||
+	    (skb->mac.ethernet->h_proto == __constant_htons(ETH_P_RARP)))) {
+		struct arphdr * arph = skb->nh.arph;
+		// max length: 40
+		printk(" ARP HTYPE=%d, PTYPE=0x%04x, OPCODE=%d",
+		   ntohs(arph->ar_hrd), ntohs(arph->ar_pro),
+		   ntohs(arph->ar_op));
+	}
+	printk("\n");
+	spin_unlock_bh(&ebt_log_lock);
+}
+
+struct ebt_watcher log =
+{
+	{NULL, NULL}, EBT_LOG_WATCHER, ebt_log, ebt_log_check, NULL,
+	THIS_MODULE
+};
+
+static int __init init(void)
+{
+	return ebt_register_watcher(&log);
+}
+
+static void __exit fini(void)
+{
+	ebt_unregister_watcher(&log);
+}
+
+module_init(init);
+module_exit(fini);
+EXPORT_NO_SYMBOLS;
+MODULE_LICENSE("GPL");