-/*
- * This is a module which is used for counting packets.
- */
+/***************************************************************************
+ * This is a module which is used for counting packets. *
+ * See http://www.intra2net.com/opensource/ipt_account *
+ * for further information *
+ * *
+ * Copyright (C) 2004 by Intra2net AG *
+ * opensource@intra2net.com *
+ * *
+ * This program is free software; you can redistribute it and/or modify *
+ * it under the terms of the GNU General Public License *
+ * version 2 as published by the Free Software Foundation; *
+ * *
+ ***************************************************************************/
+
#include <linux/module.h>
#include <linux/skbuff.h>
#include <linux/ip.h>
#include <net/route.h>
#include <linux/netfilter_ipv4/ipt_ACCOUNT.h>
-//#if 0
+#if 0
#define DEBUGP printk
-//#else
-//#define DEBUGP(format, args...)
-//#endif
+#else
+#define DEBUGP(format, args...)
+#endif
struct ipt_account_table *ipt_account_tables = NULL;
struct ipt_account_handle *ipt_account_handles = NULL;
+void *ipt_account_tmpbuf = NULL;
+// Spinlock used for manipulating the current accounting tables/data
static spinlock_t ipt_account_lock = SPIN_LOCK_UNLOCKED;
+// Spinlock used for manipulating userspace handles/snapshot data
+static spinlock_t ipt_account_userspace_lock = SPIN_LOCK_UNLOCKED;
-static unsigned int
-ipt_account_target(struct sk_buff **pskb,
- unsigned int hooknum,
- const struct net_device *in,
- const struct net_device *out,
- const void *targinfo,
- void *userinfo)
-{
- spin_lock_bh(&ipt_account_lock);
- spin_unlock_bh(&ipt_account_lock);
-
- return IPT_CONTINUE;
-}
/* Recursive free of all data structures */
-void ipt_account_data_free(void *data, unsigned char netsize)
+void ipt_account_data_free(void *data, unsigned char depth)
{
// Empty data set
if (!data)
return;
- // Free for 8 bit network. Special: 0.0.0.0/0
- if (netsize >= 24 || netsize == 0)
+ // Free for 8 bit network
+ if (depth == 0)
{
- kfree(data);
+ free_page((unsigned long)data);
data = NULL;
return;
}
// Free for 16 bit network
- if (netsize >= 16)
+ if (depth == 1)
{
struct ipt_account_mask_16 *mask_16 = (struct ipt_account_mask_16 *)data;
- unsigned char b;
- for (b=0; b < 255; b++)
+ unsigned int b;
+ for (b=0; b <= 255; b++)
{
if (mask_16->mask_24[b] != 0)
{
- kfree(mask_16->mask_24[b]);
+ free_page((unsigned long)mask_16->mask_24[b]);
mask_16->mask_24[b] = NULL;
}
}
- kfree(data);
+ free_page((unsigned long)data);
data = NULL;
return;
}
// Free for 24 bit network
- if (netsize >= 8)
+ if (depth == 3)
{
- unsigned char a, b;
- for (a=0; a < 255; a++)
+ unsigned int a, b;
+ for (a=0; a <= 255; a++)
{
if (((struct ipt_account_mask_8 *)data)->mask_16[a])
{
struct ipt_account_mask_16 *mask_16 = (struct ipt_account_mask_16*)((struct ipt_account_mask_8 *)data)->mask_16[a];
- for (b=0; b < 255; b++)
+ for (b=0; b <= 255; b++)
{
if (mask_16->mask_24[b]) {
- kfree(mask_16->mask_24[b]);
+ free_page((unsigned long)mask_16->mask_24[b]);
mask_16->mask_24[b] = NULL;
}
}
- kfree(mask_16);
+ free_page((unsigned long)mask_16);
mask_16 = NULL;
}
}
- kfree(data);
+ free_page((unsigned long)data);
data = NULL;
return;
}
- printk("ACCOUNT: ipt_account_data_free called with broken netsize: %d\n", netsize);
+ printk("ACCOUNT: ipt_account_data_free called with unknown depth: %d\n", depth);
return;
}
{
unsigned int i;
- DEBUGP("ACCOUNT: ipt_account_table_insert: %s, %u/%u\n", name, ip, netmask);
+ DEBUGP("ACCOUNT: ipt_account_table_insert: %s, %u.%u.%u.%u/%u.%u.%u.%u\n", name, NIPQUAD(ip), NIPQUAD(netmask));
// Look for existing table
for (i = 0; i < ACCOUNT_MAX_TABLES; i++)
{
- if (strcmp(ipt_account_tables[i].name, name) == 0)
+ if (strncmp(ipt_account_tables[i].name, name, ACCOUNT_TABLE_NAME_LEN) == 0)
{
- DEBUGP("ACCOUT: Found existing slot: %d - %u/%u\n", i, ipt_account_tables[i].ip, ipt_account_tables[i].netmask);
+ DEBUGP("ACCOUNT: Found existing slot: %d - %u.%u.%u.%u/%u.%u.%u.%u\n", i,
+ NIPQUAD(ipt_account_tables[i].ip), NIPQUAD(ipt_account_tables[i].netmask));
if (ipt_account_tables[i].ip != ip || ipt_account_tables[i].netmask != netmask)
{
- printk("ACCOUNT: Table %s found, but IP/netmask mismatch. IP/netmask found: %u/%u\n",
- name, ipt_account_tables[i].ip, ipt_account_tables[i].netmask);
+ printk("ACCOUNT: Table %s found, but IP/netmask mismatch. IP/netmask found: %u.%u.%u.%u/%u.%u.%u.%u\n",
+ name, NIPQUAD(ipt_account_tables[i].ip), NIPQUAD(ipt_account_tables[i].netmask));
return -1;
}
ipt_account_tables[i].ip = ip;
ipt_account_tables[i].netmask = netmask;
- // calculate netsize
- unsigned int j, calc_mask;
+ // Calculate netsize
+ unsigned int j, calc_mask, netsize=0;
calc_mask = htonl(netmask);
for (j = 31; j > 0; j--)
{
if (calc_mask&(1<<j))
- ipt_account_tables[i].netsize++;
+ netsize++;
else
break;
}
- printk("ACCOUNT: calculated netsize: %u\n", ipt_account_tables[i].netsize);
+
+ // Calculate depth from netsize
+ if (netsize >= 24)
+ ipt_account_tables[i].depth = 0;
+ else if (netsize >= 16)
+ ipt_account_tables[i].depth = 1;
+ else if(netsize >= 8)
+ ipt_account_tables[i].depth = 2;
+
+ printk("ACCOUNT: calculated netsize: %u -> ipt_account_table depth %u\n", netsize, ipt_account_tables[i].depth);
ipt_account_tables[i].refcount++;
- if (!(ipt_account_tables[i].data = (void *)get_zeroed_page(GFP_KERNEL)))
+ if ((ipt_account_tables[i].data = (void *)get_zeroed_page(GFP_KERNEL)) == NULL)
{
- printk("ACCOUNT: Out of memory for data of table: %s\n", name);
+ printk("ACCOUNT: out of memory for data of table: %s\n", name);
memset(&ipt_account_tables[i], 0, sizeof(struct ipt_account_table));
return -1;
}
+
return i;
}
}
return 0;
}
+ spin_lock_bh(&ipt_account_lock);
int table_nr = ipt_account_table_insert(info->table_name, info->net_ip, info->net_mask);
if (table_nr == -1)
{
printk("ACCOUNT: Table insert problem. Aborting\n");
+ spin_unlock_bh(&ipt_account_lock);
return 0;
}
-
// Table nr caching so we don't have to do an extra string compare for every packet
info->table_nr = table_nr;
+ spin_unlock_bh(&ipt_account_lock);
+
return 1;
}
+void ipt_account_deleteentry(void *targinfo, unsigned int targinfosize)
+{
+ unsigned int i;
+ struct ipt_account_info *info = targinfo;
+
+ if (targinfosize != IPT_ALIGN(sizeof(struct ipt_account_info))) {
+ DEBUGP("ACCOUNT: targinfosize %u != %u\n",
+ targinfosize, IPT_ALIGN(sizeof(struct ipt_account_info)));
+ }
+
+ spin_lock_bh(&ipt_account_lock);
+
+ DEBUGP("ACCOUNT: ipt_account_deleteentry called for table: %s (#%d)\n", info->table_name, info->table_nr);
+
+ info->table_nr = -1; // Set back to original state
+
+ // Look for table
+ for (i = 0; i < ACCOUNT_MAX_TABLES; i++)
+ {
+ if (strncmp(ipt_account_tables[i].name, info->table_name, ACCOUNT_TABLE_NAME_LEN) == 0)
+ {
+ DEBUGP("ACCOUNT: Found table at slot: %d\n", i);
+
+ ipt_account_tables[i].refcount--;
+ DEBUGP("ACCOUNT: Refcount left: %d\n", ipt_account_tables[i].refcount);
+
+ // Table not needed anymore?
+ if (ipt_account_tables[i].refcount == 0)
+ {
+ DEBUGP("ACCOUNT: Destroying table at slot: %d\n", i);
+ ipt_account_data_free(ipt_account_tables[i].data, ipt_account_tables[i].depth);
+ memset(&ipt_account_tables[i], 0, sizeof(struct ipt_account_table));
+ }
+
+ spin_unlock_bh(&ipt_account_lock);
+ return;
+ }
+ }
+
+ // Table not found
+ printk("ACCOUNT: Table %s not found for destroy\n", info->table_name);
+ spin_unlock_bh(&ipt_account_lock);
+}
+
+void ipt_account_depth0_insert(struct ipt_account_mask_24 *mask_24, unsigned int net_ip, unsigned int netmask,
+ unsigned int src_ip, unsigned int dst_ip, unsigned int size, unsigned int *itemcount)
+{
+ unsigned char is_src = 0, is_dst = 0;
+
+ DEBUGP("ACCOUNT: ipt_account_depth0_insert: %u.%u.%u.%u/%u.%u.%u.%u for net %u.%u.%u.%u/%u.%u.%u.%u, size: %u\n",
+ NIPQUAD(src_ip), NIPQUAD(dst_ip), NIPQUAD(net_ip), NIPQUAD(netmask), size);
+
+ // Check if src/dst is inside our network.
+ // Special: net_ip = 0.0.0.0/0 gets stored as src in slot 0
+ if (!netmask)
+ src_ip = 0;
+ if ((net_ip&netmask) == (src_ip&netmask))
+ is_src = 1;
+ if ((net_ip&netmask) == (dst_ip&netmask) && netmask)
+ is_dst = 1;
+
+ if (!is_src && !is_dst)
+ {
+ DEBUGP("ACCOUNT: Skipping packet %u.%u.%u.%u/%u.%u.%u.%u for net %u.%u.%u.%u/%u.%u.%u.%u\n",
+ NIPQUAD(src_ip), NIPQUAD(dst_ip), NIPQUAD(net_ip), NIPQUAD(netmask));
+ return;
+ }
+
+ // Check if this entry is new
+ char is_src_new_ip = 0, is_dst_new_ip = 0;
+
+ // Calculate array positions
+ unsigned char src_slot = (unsigned char)((src_ip&0xFF000000) >> 24);
+ unsigned char dst_slot = (unsigned char)((dst_ip&0xFF000000) >> 24);
+
+ // Increase size counters
+ if (is_src)
+ {
+ // Calculate network slot
+ DEBUGP("ACCOUNT: Calculated SRC 8 bit network slot: %d\n", src_slot);
+ if (!mask_24->ip[src_slot].src_packets && !mask_24->ip[src_slot].dst_packets)
+ is_src_new_ip = 1;
+
+ mask_24->ip[src_slot].src_packets++;
+ mask_24->ip[src_slot].src_bytes+=size;
+ }
+ if (is_dst)
+ {
+ DEBUGP("ACCOUNT: Calculated DST 8 bit network slot: %d\n", dst_slot);
+ if (!mask_24->ip[dst_slot].src_packets && !mask_24->ip[dst_slot].dst_packets)
+ is_dst_new_ip = 1;
+
+ mask_24->ip[dst_slot].dst_packets++;
+ mask_24->ip[dst_slot].dst_bytes+=size;
+ }
+
+ // Increase itemcounter
+ DEBUGP("ACCOUNT: Itemcounter before: %d\n", *itemcount);
+ if (src_slot == dst_slot)
+ {
+ if (is_src_new_ip || is_dst_new_ip) {
+ DEBUGP("ACCOUNT: src_slot == dst_slot: %d, %d\n", is_src_new_ip, is_dst_new_ip);
+ (*itemcount)++;
+ }
+ } else {
+ if (is_src_new_ip) {
+ DEBUGP("ACCOUNT: New src_ip: %u.%u.%u.%u\n", NIPQUAD(src_ip));
+ (*itemcount)++;
+ }
+ if (is_dst_new_ip) {
+ DEBUGP("ACCOUNT: New dst_ip: %u.%u.%u.%u\n", NIPQUAD(dst_ip));
+ (*itemcount)++;
+ }
+ }
+ DEBUGP("ACCOUNT: Itemcounter after: %d\n", *itemcount);
+}
+
+void ipt_account_depth1_insert(struct ipt_account_mask_16 *mask_16, unsigned int net_ip, unsigned int netmask,
+ unsigned int src_ip, unsigned int dst_ip, unsigned int size, unsigned int *itemcount)
+{
+ // Do we need to process src IP?
+ if ((net_ip&netmask) == (src_ip&netmask))
+ {
+ unsigned char slot = (unsigned char)((src_ip&0x00FF0000) >> 16);
+ DEBUGP("ACCOUNT: Calculated SRC 16 bit network slot: %d\n", slot);
+
+ // Do we need to create a new mask_24 bucket?
+ if (!mask_16->mask_24[slot] && (mask_16->mask_24[slot] = (void *)get_zeroed_page(GFP_KERNEL)) == NULL)
+ {
+ printk("ACCOUNT: Can't process packet because out of memory!\n");
+ return;
+ }
+
+ ipt_account_depth0_insert((struct ipt_account_mask_24 *)mask_16->mask_24[slot], net_ip, netmask,
+ src_ip, 0, size, itemcount);
+ }
+
+ // Do we need to process dst IP?
+ if ((net_ip&netmask) == (dst_ip&netmask))
+ {
+ unsigned char slot = (unsigned char)((dst_ip&0x00FF0000) >> 16);
+ DEBUGP("ACCOUNT: Calculated DST 16 bit network slot: %d\n", slot);
+
+ // Do we need to create a new mask_24 bucket?
+ if (!mask_16->mask_24[slot] && (mask_16->mask_24[slot] = (void *)get_zeroed_page(GFP_KERNEL)) == NULL)
+ {
+ printk("ACCOUT: Can't process packet because out of memory!\n");
+ return;
+ }
+
+ ipt_account_depth0_insert((struct ipt_account_mask_24 *)mask_16->mask_24[slot], net_ip, netmask,
+ 0, dst_ip, size, itemcount);
+ }
+}
+
+void ipt_account_depth2_insert(struct ipt_account_mask_8 *mask_8, unsigned int net_ip, unsigned int netmask,
+ unsigned int src_ip, unsigned int dst_ip, unsigned int size, unsigned int *itemcount)
+{
+ // Do we need to process src IP?
+ if ((net_ip&netmask) == (src_ip&netmask))
+ {
+ unsigned char slot = (unsigned char)((src_ip&0x0000FF00) >> 8);
+ DEBUGP("ACCOUNT: Calculated SRC 24 bit network slot: %d\n", slot);
+
+ // Do we need to create a new mask_24 bucket?
+ if (!mask_8->mask_16[slot] && (mask_8->mask_16[slot] = (void *)get_zeroed_page(GFP_KERNEL)) == NULL)
+ {
+ printk("ACCOUNT: Can't process packet because out of memory!\n");
+ return;
+ }
+
+ ipt_account_depth1_insert((struct ipt_account_mask_16 *)mask_8->mask_16[slot], net_ip, netmask,
+ src_ip, 0, size, itemcount);
+ }
+
+ // Do we need to process dst IP?
+ if ((net_ip&netmask) == (dst_ip&netmask))
+ {
+ unsigned char slot = (unsigned char)((dst_ip&0x0000FF00) >> 8);
+ DEBUGP("ACCOUNT: Calculated DST 24 bit network slot: %d\n", slot);
+
+ // Do we need to create a new mask_24 bucket?
+ if (!mask_8->mask_16[slot] && (mask_8->mask_16[slot] = (void *)get_zeroed_page(GFP_KERNEL)) == NULL)
+ {
+ printk("ACCOUNT: Can't process packet because out of memory!\n");
+ return;
+ }
+
+ ipt_account_depth1_insert((struct ipt_account_mask_16 *)mask_8->mask_16[slot], net_ip, netmask,
+ 0, dst_ip, size, itemcount);
+ }
+}
+
+static unsigned int ipt_account_target(struct sk_buff **pskb,
+ unsigned int hooknum,
+ const struct net_device *in,
+ const struct net_device *out,
+ const void *targinfo,
+ void *userinfo)
+{
+ const struct ipt_account_info *info = (const struct ipt_account_info *)targinfo;
+ unsigned int src_ip = (*pskb)->nh.iph->saddr;
+ unsigned int dst_ip = (*pskb)->nh.iph->daddr;
+ unsigned int size = ntohs((*pskb)->nh.iph->tot_len);
+
+ spin_lock_bh(&ipt_account_lock);
+
+ if (ipt_account_tables[info->table_nr].name[0] == 0)
+ {
+ printk("ACCOUNT: ipt_account_target: Invalid table id %u. IPs %u.%u.%u.%u/%u.%u.%u.%u\n",
+ info->table_nr, NIPQUAD(src_ip), NIPQUAD(dst_ip));
+ spin_unlock_bh(&ipt_account_lock);
+ return IPT_CONTINUE;
+ }
+
+ // 8 bit network or "any" network
+ if (ipt_account_tables[info->table_nr].depth == 0)
+ {
+ // Count packet and check if the IP is new
+ ipt_account_depth0_insert((struct ipt_account_mask_24 *)ipt_account_tables[info->table_nr].data,
+ ipt_account_tables[info->table_nr].ip, ipt_account_tables[info->table_nr].netmask,
+ src_ip, dst_ip, size, &ipt_account_tables[info->table_nr].itemcount);
+ spin_unlock_bh(&ipt_account_lock);
+ return IPT_CONTINUE;
+ }
+
+ // 16 bit network
+ if (ipt_account_tables[info->table_nr].depth == 1)
+ {
+ ipt_account_depth1_insert((struct ipt_account_mask_16 *)ipt_account_tables[info->table_nr].data,
+ ipt_account_tables[info->table_nr].ip, ipt_account_tables[info->table_nr].netmask,
+ src_ip, dst_ip, size, &ipt_account_tables[info->table_nr].itemcount);
+ spin_unlock_bh(&ipt_account_lock);
+ return IPT_CONTINUE;
+ }
+
+ // 24 bit network
+ if (ipt_account_tables[info->table_nr].depth == 2)
+ {
+ ipt_account_depth2_insert((struct ipt_account_mask_8 *)ipt_account_tables[info->table_nr].data,
+ ipt_account_tables[info->table_nr].ip, ipt_account_tables[info->table_nr].netmask,
+ src_ip, dst_ip, size, &ipt_account_tables[info->table_nr].itemcount);
+ spin_unlock_bh(&ipt_account_lock);
+ return IPT_CONTINUE;
+ }
+
+ printk("ACCOUNT: ipt_account_target: Unable to process packet. Table id %u. IPs %u.%u.%u.%u/%u.%u.%u.%u\n",
+ info->table_nr, NIPQUAD(src_ip), NIPQUAD(dst_ip));
+
+ spin_unlock_bh(&ipt_account_lock);
+ return IPT_CONTINUE;
+}
+
+/*
+ Functions dealing with "handles":
+ Handles are snapshots of a accounting state.
+
+ read snapshots are only for debugging the code
+ and are very expensive concerning speed/memory
+ compared to read_and_flush.
+
+ The functions aren't protected by spinlocks themselves
+ as this is done in the ioctl part of the code.
+*/
+
+/*
+ Find a free handle slot. Normally only one should be used,
+ but there could be two or more applications accessing the data
+ at the same time.
+*/
+int ipt_account_handle_find_slot(void)
+{
+ unsigned int i;
+ // Insert new table
+ for (i = 0; i < ACCOUNT_MAX_HANDLES; i++)
+ {
+ // Found free slot
+ if (ipt_account_handles[i].data == NULL)
+ {
+ // Don't "mark" data as used as we are protected by a spinlock by the calling function.
+ // handle_find_slot() is only a function to prevent code duplication.
+ return i;
+ }
+ }
+
+ // No free slot found
+ printk("ACCOUNT: No free handle slot found (max: %u). Please increase ACCOUNT_MAX_HANDLES.\n", ACCOUNT_MAX_HANDLES);
+ return -1;
+}
+
+int ipt_account_handle_free(unsigned int handle)
+{
+ if (handle >= ACCOUNT_MAX_HANDLES)
+ {
+ printk("ACCOUNT: Invalid handle for ipt_account_handle_free() specified: %u\n", handle);
+ return -EINVAL;
+ }
+
+ ipt_account_data_free(ipt_account_handles[handle].data, ipt_account_handles[handle].depth);
+ memset (&ipt_account_handles[handle], 0, sizeof (struct ipt_account_handle));
+ return 0;
+}
+
+/* Prepare data for read without flush. Use only for debugging!
+ Real applications should use read&flush as it's way more efficent */
+int ipt_account_handle_prepare_read(char *tablename, unsigned int *count)
+{
+ int handle, i, table_nr=-1;
+
+ for (i = 0; i < ACCOUNT_MAX_TABLES; i++)
+ if (strncmp(ipt_account_tables[i].name, tablename, ACCOUNT_TABLE_NAME_LEN) == 0)
+ {
+ table_nr = i;
+ break;
+ }
+
+ if (table_nr == -1)
+ {
+ printk("ACCOUNT: ipt_account_handle_prepare_read(): Table %s not found\n", tablename);
+ return -1;
+ }
+
+ // Can't find a free handle slot?
+ if ((handle = ipt_account_handle_find_slot()) == -1)
+ return -1;
+
+ // Fill up handle structure
+ ipt_account_handles[handle].ip = ipt_account_tables[table_nr].ip;
+ ipt_account_handles[handle].depth = ipt_account_tables[table_nr].depth;
+ ipt_account_handles[handle].itemcount = ipt_account_tables[table_nr].itemcount;
+
+ // allocate "root" table
+ if ((ipt_account_handles[handle].data = (void*)get_zeroed_page(GFP_KERNEL)) == NULL)
+ {
+ printk("ACCOUNT: out of memory for root table in ipt_account_handle_prepare_read()\n");
+ memset (&ipt_account_handles[handle], 0, sizeof(struct ipt_account_handle));
+ return -1;
+ }
+
+ // Recursive copy of complete data structure
+ unsigned int depth = ipt_account_handles[handle].depth;
+ if (depth == 0)
+ {
+ memcpy(ipt_account_handles[handle].data, ipt_account_tables[table_nr].data, sizeof(struct ipt_account_mask_24));
+ } else if (depth == 1) {
+ struct ipt_account_mask_16 *src_16 = (struct ipt_account_mask_16 *)ipt_account_tables[table_nr].data;
+ struct ipt_account_mask_16 *network_16 = (struct ipt_account_mask_16 *)ipt_account_handles[handle].data;
+ unsigned int b;
+
+ for (b = 0; b <= 255; b++)
+ {
+ if (src_16->mask_24[b])
+ {
+ if ((network_16->mask_24[b] = (void*)get_zeroed_page(GFP_KERNEL)) == NULL)
+ {
+ printk("ACCOUNT: out of memory during copy of 16 bit network in ipt_account_handle_prepare_read()\n");
+ ipt_account_data_free(ipt_account_handles[handle].data, depth);
+ memset (&ipt_account_handles[handle], 0, sizeof(struct ipt_account_handle));
+ return -1;
+ }
+
+ memcpy(network_16->mask_24[b], src_16->mask_24[b], sizeof(struct ipt_account_mask_24));
+ }
+ }
+ } else if(depth == 2) {
+ struct ipt_account_mask_8 *src_8 = (struct ipt_account_mask_8 *)ipt_account_tables[table_nr].data;
+ struct ipt_account_mask_8 *network_8 = (struct ipt_account_mask_8 *)ipt_account_handles[handle].data;
+ unsigned int a;
+
+ for (a = 0; a <= 255; a++)
+ {
+ if (src_8->mask_16[a])
+ {
+ if ((network_8->mask_16[a] = (void*)get_zeroed_page(GFP_KERNEL)) == NULL)
+ {
+ printk("ACCOUNT: out of memory during copy of 24 bit network in ipt_account_handle_prepare_read()\n");
+ ipt_account_data_free(ipt_account_handles[handle].data, depth);
+ memset (&ipt_account_handles[handle], 0, sizeof(struct ipt_account_handle));
+ return -1;
+ }
+
+ memcpy(network_8->mask_16[a], src_8->mask_16[a], sizeof(struct ipt_account_mask_16));
+
+ struct ipt_account_mask_16 *src_16 = src_8->mask_16[a];
+ struct ipt_account_mask_16 *network_16 = network_8->mask_16[a];
+ unsigned int b;
+
+ for (b = 0; b <= 255; b++)
+ {
+ if (src_16->mask_24[b])
+ {
+ if ((network_16->mask_24[b] = (void*)get_zeroed_page(GFP_KERNEL)) == NULL)
+ {
+ printk("ACCOUNT: out of memory during copy of 16 bit network in ipt_account_handle_prepare_read()\n");
+ ipt_account_data_free(ipt_account_handles[handle].data, depth);
+ memset (&ipt_account_handles[handle], 0, sizeof(struct ipt_account_handle));
+ return -1;
+ }
+
+ memcpy(network_16->mask_24[b], src_16->mask_24[b], sizeof(struct ipt_account_mask_24));
+ }
+ }
+ }
+ }
+ }
+
+ *count = ipt_account_tables[table_nr].itemcount;
+ return handle;
+}
+
+/* Prepare data for read and flush it */
+int ipt_account_handle_prepare_read_flush(char *tablename, unsigned int *count)
+{
+ int handle, i, table_nr=-1;
+
+ for (i = 0; i < ACCOUNT_MAX_TABLES; i++)
+ if (strncmp(ipt_account_tables[i].name, tablename, ACCOUNT_TABLE_NAME_LEN) == 0)
+ {
+ table_nr = i;
+ break;
+ }
+
+ if (table_nr == -1)
+ {
+ printk("ACCOUNT: ipt_account_handle_prepare_read_flush(): Table %s not found\n", tablename);
+ return -1;
+ }
+
+ // Can't find a free handle slot?
+ if ((handle = ipt_account_handle_find_slot()) == -1)
+ return -1;
+
+ // Fill up handle structure
+ ipt_account_handles[handle].ip = ipt_account_tables[table_nr].ip;
+ ipt_account_handles[handle].depth = ipt_account_tables[table_nr].depth;
+ ipt_account_handles[handle].itemcount = ipt_account_tables[table_nr].itemcount;
+ ipt_account_handles[handle].data = ipt_account_tables[table_nr].data;
+ *count = ipt_account_tables[table_nr].itemcount;
+
+ // "Flush" table data
+ ipt_account_tables[table_nr].data = (void*)get_zeroed_page(GFP_KERNEL);
+ ipt_account_tables[table_nr].itemcount = 0;
+
+ return handle;
+}
+
+/* Copy the actual that into a prepared buffer.
+ We only copy entries != 0 to increase performance.
+ The memory gets freed again in ipt_account_handle_free().
+*/
+int ipt_account_handle_get_data(unsigned int handle, void *buffer)
+{
+ struct ipt_account_handle_ip handle_ip;
+ unsigned int handle_ip_size = sizeof (struct ipt_account_handle_ip);
+ unsigned int i, tmpbuf_pos=0;
+
+ if (handle >= ACCOUNT_MAX_HANDLES)
+ {
+ printk("ACCOUNT: invalid handle for ipt_account_handle_get_data() specified: %u\n", handle);
+ return -1;
+ }
+
+ if (ipt_account_handles[handle].data == NULL)
+ {
+ printk("ACCOUNT: handle %u is BROKEN: Contains no data\n", handle);
+ return -1;
+ }
+
+ unsigned int net_ip = ipt_account_handles[handle].ip;
+ unsigned int depth = ipt_account_handles[handle].depth;
+
+ // 8 bit network
+ if (depth == 0)
+ {
+ struct ipt_account_mask_24 *network = (struct ipt_account_mask_24*)ipt_account_handles[handle].data;
+ for (i = 0; i <= 255; i++)
+ {
+ if (network->ip[i].src_packets || network->ip[i].dst_packets)
+ {
+ handle_ip.ip = net_ip | (i<<24);
+ handle_ip.src_packets = network->ip[i].src_packets;
+ handle_ip.src_bytes = network->ip[i].src_bytes;
+ handle_ip.dst_packets = network->ip[i].dst_packets;
+ handle_ip.dst_bytes = network->ip[i].dst_bytes;
+
+ // Temporary buffer full? Flush to userspace
+ if (tmpbuf_pos+handle_ip_size >= PAGE_SIZE)
+ {
+ copy_to_user(buffer, ipt_account_tmpbuf, tmpbuf_pos);
+ tmpbuf_pos = 0;
+ }
+ memcpy(ipt_account_tmpbuf+tmpbuf_pos, &handle_ip, handle_ip_size);
+ tmpbuf_pos += handle_ip_size;
+ }
+ }
+
+ // Flush remaining data to userspace
+ if (tmpbuf_pos)
+ copy_to_user(buffer, ipt_account_tmpbuf, tmpbuf_pos);
+
+ return 0;
+ }
+
+ // 16 bit network
+ if (depth == 1)
+ {
+ struct ipt_account_mask_16 *network_16 = (struct ipt_account_mask_16*)ipt_account_handles[handle].data;
+ unsigned int b;
+ for (b = 0; b <= 255; b++)
+ {
+ if (network_16->mask_24[b])
+ {
+ struct ipt_account_mask_24 *network = (struct ipt_account_mask_24*)network_16->mask_24[b];
+ for (i = 0; i <= 255; i++)
+ {
+ if (network->ip[i].src_packets || network->ip[i].dst_packets)
+ {
+ handle_ip.ip = net_ip | (b << 16) | (i<<24);
+ handle_ip.src_packets = network->ip[i].src_packets;
+ handle_ip.src_bytes = network->ip[i].src_bytes;
+ handle_ip.dst_packets = network->ip[i].dst_packets;
+ handle_ip.dst_bytes = network->ip[i].dst_bytes;
+
+ // Temporary buffer full? Flush to userspace
+ if (tmpbuf_pos+handle_ip_size >= PAGE_SIZE)
+ {
+ copy_to_user(buffer, ipt_account_tmpbuf, tmpbuf_pos);
+ tmpbuf_pos = 0;
+ }
+ memcpy(ipt_account_tmpbuf+tmpbuf_pos, &handle_ip, handle_ip_size);
+ tmpbuf_pos += handle_ip_size;
+ }
+ }
+ }
+ }
+
+ // Flush remaining data to userspace
+ if (tmpbuf_pos)
+ copy_to_user(buffer, ipt_account_tmpbuf, tmpbuf_pos);
+
+ return 0;
+ }
+
+ // 24 bit network
+ if (depth == 2)
+ {
+ struct ipt_account_mask_8 *network_8 = (struct ipt_account_mask_8*)ipt_account_handles[handle].data;
+ unsigned int a, b;
+ for (a = 0; a <= 255; a++)
+ {
+ if (network_8->mask_16[a])
+ {
+ struct ipt_account_mask_16 *network_16 = (struct ipt_account_mask_16*)network_8->mask_16[a];
+ for (b = 0; b <= 255; b++)
+ {
+ if (network_16->mask_24[b])
+ {
+ struct ipt_account_mask_24 *network = (struct ipt_account_mask_24*)network_16->mask_24[b];
+ for (i = 0; i <= 255; i++)
+ {
+ if (network->ip[i].src_packets || network->ip[i].dst_packets)
+ {
+ handle_ip.ip = net_ip | (a << 8) | (b << 16) | (i<<24);
+ handle_ip.src_packets = network->ip[i].src_packets;
+ handle_ip.src_bytes = network->ip[i].src_bytes;
+ handle_ip.dst_packets = network->ip[i].dst_packets;
+ handle_ip.dst_bytes = network->ip[i].dst_bytes;
+
+ // Temporary buffer full? Flush to userspace
+ if (tmpbuf_pos+handle_ip_size >= PAGE_SIZE)
+ {
+ copy_to_user(buffer, ipt_account_tmpbuf, tmpbuf_pos);
+ tmpbuf_pos = 0;
+ }
+ memcpy(ipt_account_tmpbuf+tmpbuf_pos, &handle_ip, handle_ip_size);
+ tmpbuf_pos += handle_ip_size;
+ }
+ }
+ }
+ }
+ }
+ }
+
+ // Flush remaining data to userspace
+ if (tmpbuf_pos)
+ copy_to_user(buffer, ipt_account_tmpbuf, tmpbuf_pos);
+
+ return 0;
+ }
+
+ return -1;
+}
+
+static int ipt_account_set_ctl(struct sock *sk, int cmd, void *user, unsigned int len)
+{
+ struct ipt_account_handle_sockopt handle;
+ int ret = -EINVAL;
+
+ if (!capable(CAP_NET_ADMIN))
+ return -EPERM;
+
+ switch (cmd)
+ {
+ case IPT_SO_SET_ACCOUNT_HANDLE_FREE:
+ if (len != sizeof(struct ipt_account_handle_sockopt))
+ {
+ printk("ACCOUNT: ipt_account_set_ctl: wrong data size (%u != %u) for IPT_SO_SET_HANDLE_FREE\n", len, sizeof(struct ipt_account_handle_sockopt));
+ break;
+ }
+
+ if (copy_from_user (&handle, user, len))
+ {
+ printk("ACCOUNT: ipt_account_set_ctl: copy_from_user failed for IPT_SO_SET_HANDLE_FREE\n");
+ break;
+ }
+
+ spin_lock_bh(&ipt_account_userspace_lock);
+ ret = ipt_account_handle_free(handle.handle_nr);
+ spin_unlock_bh(&ipt_account_userspace_lock);
+ break;
+ case IPT_SO_SET_ACCOUNT_HANDLE_FREE_ALL:
+ {
+ unsigned int i;
+ spin_lock_bh(&ipt_account_userspace_lock);
+ for (i = 0; i < ACCOUNT_MAX_HANDLES; i++)
+ ipt_account_handle_free(i);
+ spin_unlock_bh(&ipt_account_userspace_lock);
+ ret = 0;
+ break;
+ }
+ default:
+ printk("ACCOUNT: ipt_account_set_ctl: unknown request %i\n", cmd);
+ }
+
+ return ret;
+}
+
+static int ipt_account_get_ctl(struct sock *sk, int cmd, void *user, int *len)
+{
+ struct ipt_account_handle_sockopt handle;
+ int ret = -EINVAL;
+
+ if (!capable(CAP_NET_ADMIN))
+ return -EPERM;
+
+ switch (cmd)
+ {
+ case IPT_SO_GET_ACCOUNT_PREPARE_READ_FLUSH:
+ case IPT_SO_GET_ACCOUNT_PREPARE_READ:
+ if (*len < sizeof(struct ipt_account_handle_sockopt))
+ {
+ printk("ACCOUNT: ipt_account_get_ctl: wrong data size (%u != %u) for IPT_SO_GET_ACCOUNT_PREPARE_READ/READ_FLUSH\n",
+ *len, sizeof(struct ipt_account_handle_sockopt));
+ break;
+ }
+
+ if (copy_from_user (&handle, user, sizeof(struct ipt_account_handle_sockopt)))
+ {
+ printk("ACCOUNT: ipt_account_get_ctl: copy_from_user failed for IPT_SO_GET_ACCOUNT_PREPARE_READ/READ_FLUSH\n");
+ break;
+ }
+
+ spin_lock_bh(&ipt_account_lock);
+ spin_lock_bh(&ipt_account_userspace_lock);
+ if (cmd == IPT_SO_GET_ACCOUNT_PREPARE_READ_FLUSH)
+ handle.handle_nr = ipt_account_handle_prepare_read_flush(handle.name, &handle.itemcount);
+ else
+ handle.handle_nr = ipt_account_handle_prepare_read(handle.name, &handle.itemcount);
+ spin_unlock_bh(&ipt_account_userspace_lock);
+ spin_unlock_bh(&ipt_account_lock);
+
+ if (handle.handle_nr == -1)
+ {
+ printk("ACCOUNT: ipt_account_get_ctl: ipt_account_handle_prepare_read failed\n");
+ break;
+ }
+
+ if (copy_to_user(user, &handle, sizeof(struct ipt_account_handle_sockopt)))
+ {
+ printk("ACCOUNT: ipt_account_set_ctl: copy_to_user failed for IPT_SO_GET_ACCOUNT_PREPARE_READ/READ_FLUSH\n");
+ break;
+ }
+ ret = 0;
+ break;
+ case IPT_SO_GET_ACCOUNT_GET_DATA:
+ if (*len < sizeof(struct ipt_account_handle_sockopt))
+ {
+ printk("ACCOUNT: ipt_account_get_ctl: wrong data size (%u != %u) for IPT_SO_GET_ACCOUNT_PREPARE_READ/READ_FLUSH\n",
+ *len, sizeof(struct ipt_account_handle_sockopt));
+ break;
+ }
+
+ if (copy_from_user (&handle, user, sizeof(struct ipt_account_handle_sockopt)))
+ {
+ printk("ACCOUNT: ipt_account_get_ctl: copy_from_user failed for IPT_SO_GET_ACCOUNT_PREPARE_READ/READ_FLUSH\n");
+ break;
+ }
+
+ if (handle.handle_nr >= ACCOUNT_MAX_HANDLES)
+ {
+ printk("ACCOUNT: Invalid handle for IPT_SO_GET_ACCOUNT_GET_DATA: %u\n", handle.handle_nr);
+ break;
+ }
+
+ if (*len < ipt_account_handles[handle.handle_nr].itemcount*sizeof(struct ipt_account_handle_ip))
+ {
+ printk("ACCOUNT: ipt_account_get_ctl: not enough space (%u < %u) to store data from IPT_SO_GET_ACCOUNT_GET_DATA\n",
+ *len, ipt_account_handles[handle.handle_nr].itemcount*sizeof(struct ipt_account_handle_ip));
+ ret = -ENOMEM;
+ break;
+ }
+
+ spin_lock_bh(&ipt_account_userspace_lock);
+ ret = ipt_account_handle_get_data(handle.handle_nr, user);
+ spin_unlock_bh(&ipt_account_userspace_lock);
+ if (ret)
+ {
+ printk("ACCOUNT: ipt_account_get_ctl: ipt_account_handle_get_data failed for handle %u\n", handle.handle_nr);
+ break;
+ }
+
+ ret = 0;
+ break;
+ case IPT_SO_GET_ACCOUNT_GET_HANDLE_USAGE:
+ {
+ if (*len < sizeof(struct ipt_account_handle_sockopt))
+ {
+ printk("ACCOUNT: ipt_account_get_ctl: wrong data size (%u != %u) for IPT_SO_GET_ACCOUNT_GET_HANDLE_USAGE\n",
+ *len, sizeof(struct ipt_account_handle_sockopt));
+ break;
+ }
+
+ // Find out how many handles are in use
+ unsigned int i;
+ handle.itemcount = 0;
+ spin_lock_bh(&ipt_account_userspace_lock);
+ for (i = 0; i < ACCOUNT_MAX_HANDLES; i++)
+ if (ipt_account_handles[i].data)
+ handle.itemcount++;
+ spin_unlock_bh(&ipt_account_userspace_lock);
+
+ if (copy_to_user(user, &handle, sizeof(struct ipt_account_handle_sockopt)))
+ {
+ printk("ACCOUNT: ipt_account_set_ctl: copy_to_user failed for IPT_SO_GET_ACCOUNT_GET_HANDLE_USAGE\n");
+ break;
+ }
+ ret = 0;
+ break;
+ }
+ case IPT_SO_GET_ACCOUNT_GET_TABLE_NAMES:
+ {
+ spin_lock_bh(&ipt_account_lock);
+
+ // Determine size of table names
+ unsigned int size = 0, i;
+ for (i = 0; i < ACCOUNT_MAX_TABLES; i++)
+ {
+ if (ipt_account_tables[i].name[0] != 0)
+ size += strlen (ipt_account_tables[i].name) + 1;
+ }
+ size += 1; // Terminating NULL character
+
+ if (*len < size)
+ {
+ spin_unlock_bh(&ipt_account_lock);
+ printk("ACCOUNT: ipt_account_get_ctl: not enough space (%u < %u) to store table names\n", *len, size);
+ ret = -ENOMEM;
+ break;
+ }
+ // Copy table names to userspace
+ char *tnames = user;
+ for (i = 0; i < ACCOUNT_MAX_TABLES; i++)
+ {
+ if (ipt_account_tables[i].name[0] != 0)
+ {
+ int len = strlen (ipt_account_tables[i].name) + 1;
+ copy_to_user(tnames, ipt_account_tables[i].name, len); // copy string + terminating zero
+ tnames += len;
+ }
+ }
+ // Append terminating zero
+ i = 0;
+ copy_to_user(tnames, &i, 1);
+ spin_unlock_bh(&ipt_account_lock);
+ ret = 0;
+ break;
+ }
+ default:
+ printk("ACCOUNT: ipt_account_get_ctl: unknown request %i\n", cmd);
+ }
+
+ return ret;
+}
+
static struct ipt_target ipt_account_reg
-= { { NULL, NULL }, "ACCOUNT", ipt_account_target, ipt_account_checkentry, NULL,
+= { { NULL, NULL }, "ACCOUNT", ipt_account_target, ipt_account_checkentry, ipt_account_deleteentry,
THIS_MODULE };
+static struct nf_sockopt_ops ipt_account_sockopts
+= { { NULL, NULL }, PF_INET, IPT_SO_SET_ACCOUNT_HANDLE_FREE, IPT_SO_SET_ACCOUNT_MAX+1, ipt_account_set_ctl,
+ IPT_SO_GET_ACCOUNT_PREPARE_READ, IPT_SO_GET_ACCOUNT_MAX+1, ipt_account_get_ctl, 0, NULL };
+
static int __init init(void)
{
- if (!(ipt_account_tables = kmalloc(ACCOUNT_MAX_TABLES, sizeof(struct ipt_account_table))))
+ if (PAGE_SIZE < 4096)
{
- printk("ACCOUNT: Out of memory allocating account_tables structure");
- return -EINVAL;
+ printk("ACCOUNT: Sorry we need at least a PAGE_SIZE of 4096. Found: %lu\n", PAGE_SIZE);
+ return -EINVAL;
}
- memset(ipt_account_tables, 0, sizeof(struct ipt_account_table));
+
+ if ((ipt_account_tables = kmalloc(ACCOUNT_MAX_TABLES*sizeof(struct ipt_account_table), GFP_KERNEL)) == NULL)
+ {
+ printk("ACCOUNT: Out of memory allocating account_tables structure");
+ return -EINVAL;
+ }
+ memset(ipt_account_tables, 0, ACCOUNT_MAX_TABLES*sizeof(struct ipt_account_table));
- if (!(ipt_account_handles = kmalloc(ACCOUNT_MAX_HANDLES, sizeof(struct ipt_account_handle))))
+ if ((ipt_account_handles = kmalloc(ACCOUNT_MAX_HANDLES*sizeof(struct ipt_account_handle), GFP_KERNEL)) == NULL)
{
- printk("ACCOUNT: Out of memory allocating account_handles structure");
- kfree (ipt_account_tables);
- ipt_account_tables = NULL;
- return -EINVAL;
+ printk("ACCOUNT: Out of memory allocating account_handles structure");
+ kfree (ipt_account_tables);
+ ipt_account_tables = NULL;
+ return -EINVAL;
+ }
+ memset(ipt_account_handles, 0, ACCOUNT_MAX_HANDLES*sizeof(struct ipt_account_handle));
+
+ // Allocate one page as temporary storage
+ if ((ipt_account_tmpbuf = (void*)__get_free_page(GFP_KERNEL)) == NULL)
+ {
+ printk("ACCOUNT: Out of memory for temporary buffer page\n");
+ kfree(ipt_account_tables);
+ kfree(ipt_account_handles);
+ ipt_account_tables = NULL;
+ ipt_account_handles = NULL;
+ return -EINVAL;
+ }
+
+ /* Register setsockopt */
+ if (nf_register_sockopt(&ipt_account_sockopts) < 0)
+ {
+ printk("ACCOUNT: Can't register sockopts. Aborting\n");
+
+ kfree(ipt_account_tables);
+ kfree(ipt_account_handles);
+ free_page((unsigned long)ipt_account_tmpbuf);
+ ipt_account_tables = NULL;
+ ipt_account_handles = NULL;
+ ipt_account_tmpbuf = NULL;
+
+ return -EINVAL;
}
- memset(ipt_account_handles, 0, sizeof(struct ipt_account_handle));
if (ipt_register_target(&ipt_account_reg))
return -EINVAL;
{
ipt_unregister_target(&ipt_account_reg);
+ nf_unregister_sockopt(&ipt_account_sockopts);
+
kfree(ipt_account_tables);
- ipt_account_tables = NULL;
-
kfree(ipt_account_handles);
+ free_page((unsigned long)ipt_account_tmpbuf);
+
+ ipt_account_tables = NULL;
ipt_account_handles = NULL;
+ ipt_account_tmpbuf = NULL;
}
module_init(init);
git://developer.intra2net.com / ipt_ACCOUNT / blobdiff