From 3fb0d0cca62248ffd0964638a29faf2ab5af1d1e Mon Sep 17 00:00:00 2001 From: Thomas Jarosch Date: Mon, 8 May 2006 12:16:28 +0000 Subject: [PATCH 1/1] ipt_ACCOUNT: (tomj) ported to 2.6 ATTENTION: Don't push out for Intranator --- linux-2.6.16.patch | 54 ++ linux-2.6.patch | 27 + linux-2.6/net/ipv4/netfilter/Kconfig.ladd | 21 + linux-2.6/net/ipv4/netfilter/Makefile.ladd | 2 + linux-2.6/net/ipv4/netfilter/ipt_ACCOUNT.c | 1103 ++++++++++++++++++++++++++++ 5 files changed, 1207 insertions(+), 0 deletions(-) create mode 100644 linux-2.6.16.patch create mode 100644 linux-2.6.patch create mode 100644 linux-2.6/net/ipv4/netfilter/Kconfig.ladd create mode 100644 linux-2.6/net/ipv4/netfilter/Makefile.ladd create mode 100644 linux-2.6/net/ipv4/netfilter/ipt_ACCOUNT.c diff --git a/linux-2.6.16.patch b/linux-2.6.16.patch new file mode 100644 index 0000000..113ad57 --- /dev/null +++ b/linux-2.6.16.patch @@ -0,0 +1,54 @@ +diff -u -r linux-2.6.16.14/include/linux/netfilter/x_tables.h linux-2.6.16.14.ipt_ACCOUNT/include/linux/netfilter/x_tables.h +--- linux-2.6.16.14/include/linux/netfilter/x_tables.h 2006-05-05 02:03:45.000000000 +0200 ++++ linux-2.6.16.14.ipt_ACCOUNT/include/linux/netfilter/x_tables.h 2006-05-06 13:45:18.000000000 +0200 +@@ -50,12 +50,23 @@ + #define XT_SO_SET_ADD_COUNTERS (XT_BASE_CTL + 1) + #define XT_SO_SET_MAX XT_SO_SET_ADD_COUNTERS + ++#define XT_SO_SET_ACCOUNT_HANDLE_FREE (XT_BASE_CTL + 2) ++#define XT_SO_SET_ACCOUNT_HANDLE_FREE_ALL (XT_BASE_CTL + 3) ++#define XT_SO_SET_ACCOUNT_MAX XT_SO_SET_ACCOUNT_HANDLE_FREE_ALL ++ + #define XT_SO_GET_INFO (XT_BASE_CTL) + #define XT_SO_GET_ENTRIES (XT_BASE_CTL + 1) + #define XT_SO_GET_REVISION_MATCH (XT_BASE_CTL + 2) + #define XT_SO_GET_REVISION_TARGET (XT_BASE_CTL + 3) + #define XT_SO_GET_MAX XT_SO_GET_REVISION_TARGET + ++#define XT_SO_GET_ACCOUNT_PREPARE_READ (XT_BASE_CTL + 4) ++#define XT_SO_GET_ACCOUNT_PREPARE_READ_FLUSH (XT_BASE_CTL + 5) ++#define XT_SO_GET_ACCOUNT_GET_DATA (XT_BASE_CTL + 6) ++#define XT_SO_GET_ACCOUNT_GET_HANDLE_USAGE (XT_BASE_CTL + 7) ++#define XT_SO_GET_ACCOUNT_GET_TABLE_NAMES (XT_BASE_CTL + 8) ++#define XT_SO_GET_ACCOUNT_MAX XT_SO_GET_ACCOUNT_GET_TABLE_NAMES ++ + #define SET_COUNTER(c,b,p) do { (c).bcnt = (b); (c).pcnt = (p); } while(0) + #define ADD_COUNTER(c,b,p) do { (c).bcnt += (b); (c).pcnt += (p); } while(0) + +diff -u -r linux-2.6.16.14/include/linux/netfilter_ipv4/ip_tables.h linux-2.6.16.14.ipt_ACCOUNT/include/linux/netfilter_ipv4/ip_tables.h +--- linux-2.6.16.14/include/linux/netfilter_ipv4/ip_tables.h 2006-05-05 02:03:45.000000000 +0200 ++++ linux-2.6.16.14.ipt_ACCOUNT/include/linux/netfilter_ipv4/ip_tables.h 2006-05-06 13:44:43.181915139 +0200 +@@ -160,12 +160,23 @@ + #define IPT_SO_SET_ADD_COUNTERS XT_SO_SET_ADD_COUNTERS + #define IPT_SO_SET_MAX XT_SO_SET_MAX + ++#define IPT_SO_SET_ACCOUNT_HANDLE_FREE XT_SO_SET_ACCOUNT_HANDLE_FREE ++#define IPT_SO_SET_ACCOUNT_HANDLE_FREE_ALL XT_SO_SET_ACCOUNT_HANDLE_FREE_ALL ++#define IPT_SO_SET_ACCOUNT_MAX XT_SO_SET_ACCOUNT_MAX ++ + #define IPT_SO_GET_INFO XT_SO_GET_INFO + #define IPT_SO_GET_ENTRIES XT_SO_GET_ENTRIES + #define IPT_SO_GET_REVISION_MATCH XT_SO_GET_REVISION_MATCH + #define IPT_SO_GET_REVISION_TARGET XT_SO_GET_REVISION_TARGET + #define IPT_SO_GET_MAX XT_SO_GET_REVISION_TARGET + ++#define IPT_SO_GET_ACCOUNT_PREPARE_READ XT_SO_GET_ACCOUNT_PREPARE_READ ++#define IPT_SO_GET_ACCOUNT_PREPARE_READ_FLUSH XT_SO_GET_ACCOUNT_PREPARE_READ_FLUSH ++#define IPT_SO_GET_ACCOUNT_GET_DATA XT_SO_GET_ACCOUNT_GET_DATA ++#define IPT_SO_GET_ACCOUNT_GET_HANDLE_USAGE XT_SO_GET_ACCOUNT_GET_HANDLE_USAGE ++#define IPT_SO_GET_ACCOUNT_GET_TABLE_NAMES XT_SO_GET_ACCOUNT_GET_TABLE_NAMES ++#define IPT_SO_GET_ACCOUNT_MAX XT_SO_GET_ACCOUNT_MAX ++ + #define IPT_CONTINUE XT_CONTINUE + #define IPT_RETURN XT_RETURN + diff --git a/linux-2.6.patch b/linux-2.6.patch new file mode 100644 index 0000000..b818296 --- /dev/null +++ b/linux-2.6.patch @@ -0,0 +1,27 @@ +diff -u -r -p --new-file linux-2.6.13/include/linux/netfilter_ipv4/ip_tables.h linux-2.6.13.ipt_ACCOUNT/include/linux/netfilter_ipv4/ip_tables.h +--- linux-2.6.13/include/linux/netfilter_ipv4/ip_tables.h 2005-08-29 01:41:01.000000000 +0200 ++++ linux-2.6.13.ipt_ACCOUNT/include/linux/netfilter_ipv4/ip_tables.h 2006-05-06 11:51:59.000000000 +0200 +@@ -156,12 +156,23 @@ struct ipt_entry + #define IPT_SO_SET_ADD_COUNTERS (IPT_BASE_CTL + 1) + #define IPT_SO_SET_MAX IPT_SO_SET_ADD_COUNTERS + ++#define IPT_SO_SET_ACCOUNT_HANDLE_FREE (IPT_BASE_CTL + 3) ++#define IPT_SO_SET_ACCOUNT_HANDLE_FREE_ALL (IPT_BASE_CTL + 4) ++#define IPT_SO_SET_ACCOUNT_MAX IPT_SO_SET_ACCOUNT_HANDLE_FREE_ALL ++ + #define IPT_SO_GET_INFO (IPT_BASE_CTL) + #define IPT_SO_GET_ENTRIES (IPT_BASE_CTL + 1) + #define IPT_SO_GET_REVISION_MATCH (IPT_BASE_CTL + 2) + #define IPT_SO_GET_REVISION_TARGET (IPT_BASE_CTL + 3) + #define IPT_SO_GET_MAX IPT_SO_GET_REVISION_TARGET + ++#define IPT_SO_GET_ACCOUNT_PREPARE_READ (IPT_BASE_CTL + 4) ++#define IPT_SO_GET_ACCOUNT_PREPARE_READ_FLUSH (IPT_BASE_CTL + 5) ++#define IPT_SO_GET_ACCOUNT_GET_DATA (IPT_BASE_CTL + 6) ++#define IPT_SO_GET_ACCOUNT_GET_HANDLE_USAGE (IPT_BASE_CTL + 7) ++#define IPT_SO_GET_ACCOUNT_GET_TABLE_NAMES (IPT_BASE_CTL + 8) ++#define IPT_SO_GET_ACCOUNT_MAX IPT_SO_GET_ACCOUNT_GET_TABLE_NAMES ++ + /* CONTINUE verdict for targets */ + #define IPT_CONTINUE 0xFFFFFFFF + diff --git a/linux-2.6/net/ipv4/netfilter/Kconfig.ladd b/linux-2.6/net/ipv4/netfilter/Kconfig.ladd new file mode 100644 index 0000000..bbd438b --- /dev/null +++ b/linux-2.6/net/ipv4/netfilter/Kconfig.ladd @@ -0,0 +1,21 @@ +config IP_NF_TARGET_ACCOUNT + tristate "ACCOUNT target support" + depends on IP_NF_IPTABLES + ---help--- + The ACCOUNT target is a high performance accounting system for local networks. + It takes two parameters: --addr network/netmask and --tname NAME. + + --addr is the subnet which is accounted for + --tname is the table name where the information is stored + + The data can be queried later using the libipt_ACCOUNT userspace library + or by the "iptaccount" tool which is part of the libipt_ACCOUNT package. + + A special subnet is "0.0.0.0/0": All data is stored in the src_bytes + and src_packets structure of slot "0". This is useful if you want + to account the overall traffic to/from your internet provider. + + For more information go to: + http://www.intra2net.com/de/produkte/opensource/ipt_account/ + + To compile it as a module, choose M here. If unsure, say N. diff --git a/linux-2.6/net/ipv4/netfilter/Makefile.ladd b/linux-2.6/net/ipv4/netfilter/Makefile.ladd new file mode 100644 index 0000000..90d67c1 --- /dev/null +++ b/linux-2.6/net/ipv4/netfilter/Makefile.ladd @@ -0,0 +1,2 @@ +obj-$(CONFIG_IP_NF_TARGET_REJECT) += ipt_REJECT.o +obj-$(CONFIG_IP_NF_TARGET_ACCOUNT) += ipt_ACCOUNT.o diff --git a/linux-2.6/net/ipv4/netfilter/ipt_ACCOUNT.c b/linux-2.6/net/ipv4/netfilter/ipt_ACCOUNT.c new file mode 100644 index 0000000..0431024 --- /dev/null +++ b/linux-2.6/net/ipv4/netfilter/ipt_ACCOUNT.c @@ -0,0 +1,1103 @@ +/*************************************************************************** + * This is a module which is used for counting packets. * + * See http://www.intra2net.com/opensource/ipt_account * + * for further information * + * * + * Copyright (C) 2004-2006 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 +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include + +#if 0 +#define DEBUGP printk +#else +#define DEBUGP(format, args...) +#endif + +#if (PAGE_SIZE < 4096) +#error "ipt_ACCOUNT needs at least a PAGE_SIZE of 4096" +#endif + +static struct ipt_acc_table *ipt_acc_tables = NULL; +static struct ipt_acc_handle *ipt_acc_handles = NULL; +static void *ipt_acc_tmpbuf = NULL; + +/* Spinlock used for manipulating the current accounting tables/data */ +static DEFINE_SPINLOCK(ipt_acc_lock); +/* Mutex (semaphore) used for manipulating userspace handles/snapshot data */ +static struct semaphore ipt_acc_userspace_mutex; + + +/* Recursive free of all data structures */ +static void ipt_acc_data_free(void *data, unsigned char depth) +{ + /* Empty data set */ + if (!data) + return; + + /* Free for 8 bit network */ + if (depth == 0) { + free_page((unsigned long)data); + return; + } + + /* Free for 16 bit network */ + if (depth == 1) { + struct ipt_acc_mask_16 *mask_16 = (struct ipt_acc_mask_16 *)data; + u_int32_t b; + for (b=0; b <= 255; b++) { + if (mask_16->mask_24[b] != 0) { + free_page((unsigned long)mask_16->mask_24[b]); + } + } + free_page((unsigned long)data); + return; + } + + /* Free for 24 bit network */ + if (depth == 2) { + u_int32_t a, b; + for (a=0; a <= 255; a++) { + if (((struct ipt_acc_mask_8 *)data)->mask_16[a]) { + struct ipt_acc_mask_16 *mask_16 = (struct ipt_acc_mask_16*) + ((struct ipt_acc_mask_8 *)data)->mask_16[a]; + + for (b=0; b <= 255; b++) { + if (mask_16->mask_24[b]) { + free_page((unsigned long)mask_16->mask_24[b]); + } + } + free_page((unsigned long)mask_16); + } + } + free_page((unsigned long)data); + return; + } + + printk("ACCOUNT: ipt_acc_data_free called with unknown depth: %d\n", + depth); + return; +} + +/* Look for existing table / insert new one. + Return internal ID or -1 on error */ +static int ipt_acc_table_insert(char *name, u_int32_t ip, u_int32_t netmask) +{ + u_int32_t i; + + DEBUGP("ACCOUNT: ipt_acc_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 (strncmp(ipt_acc_tables[i].name, name, + ACCOUNT_TABLE_NAME_LEN) == 0) { + DEBUGP("ACCOUNT: Found existing slot: %d - " + "%u.%u.%u.%u/%u.%u.%u.%u\n", i, + NIPQUAD(ipt_acc_tables[i].ip), + NIPQUAD(ipt_acc_tables[i].netmask)); + + if (ipt_acc_tables[i].ip != ip + || ipt_acc_tables[i].netmask != 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_acc_tables[i].ip), + NIPQUAD(ipt_acc_tables[i].netmask)); + return -1; + } + + ipt_acc_tables[i].refcount++; + DEBUGP("ACCOUNT: Refcount: %d\n", ipt_acc_tables[i].refcount); + return i; + } + } + + /* Insert new table */ + for (i = 0; i < ACCOUNT_MAX_TABLES; i++) { + /* Found free slot */ + if (ipt_acc_tables[i].name[0] == 0) { + u_int32_t calc_mask, netsize=0; + int j; /* needs to be signed, otherwise we risk endless loop */ + + DEBUGP("ACCOUNT: Found free slot: %d\n", i); + strncpy (ipt_acc_tables[i].name, name, ACCOUNT_TABLE_NAME_LEN-1); + + ipt_acc_tables[i].ip = ip; + ipt_acc_tables[i].netmask = netmask; + + /* Calculate netsize */ + calc_mask = htonl(netmask); + for (j = 31; j >= 0; j--) { + if (calc_mask&(1<= 24) + ipt_acc_tables[i].depth = 0; + else if (netsize >= 16) + ipt_acc_tables[i].depth = 1; + else if(netsize >= 8) + ipt_acc_tables[i].depth = 2; + + DEBUGP("ACCOUNT: calculated netsize: %u -> " + "ipt_acc_table depth %u\n", netsize, + ipt_acc_tables[i].depth); + + ipt_acc_tables[i].refcount++; + if ((ipt_acc_tables[i].data + = (void *)get_zeroed_page(GFP_ATOMIC)) == NULL) { + printk("ACCOUNT: out of memory for data of table: %s\n", name); + memset(&ipt_acc_tables[i], 0, + sizeof(struct ipt_acc_table)); + return -1; + } + + return i; + } + } + + /* No free slot found */ + printk("ACCOUNT: No free table slot found (max: %d). " + "Please increase ACCOUNT_MAX_TABLES.\n", ACCOUNT_MAX_TABLES); + return -1; +} + +static int ipt_acc_checkentry(const char *tablename, + const struct ipt_entry *e, + void *targinfo, + unsigned int targinfosize, + unsigned int hook_mask) +{ + struct ipt_acc_info *info = targinfo; + int table_nr; + + if (targinfosize != IPT_ALIGN(sizeof(struct ipt_acc_info))) { + DEBUGP("ACCOUNT: targinfosize %u != %u\n", + targinfosize, IPT_ALIGN(sizeof(struct ipt_acc_info))); + return 0; + } + + spin_lock_bh(&ipt_acc_lock); + table_nr = ipt_acc_table_insert(info->table_name, info->net_ip, + info->net_mask); + spin_unlock_bh(&ipt_acc_lock); + + if (table_nr == -1) { + printk("ACCOUNT: Table insert problem. Aborting\n"); + return 0; + } + /* Table nr caching so we don't have to do an extra string compare + for every packet */ + info->table_nr = table_nr; + + return 1; +} + +static void ipt_acc_deleteentry(void *targinfo, unsigned int targinfosize) +{ + u_int32_t i; + struct ipt_acc_info *info = targinfo; + + if (targinfosize != IPT_ALIGN(sizeof(struct ipt_acc_info))) { + DEBUGP("ACCOUNT: targinfosize %u != %u\n", + targinfosize, IPT_ALIGN(sizeof(struct ipt_acc_info))); + } + + spin_lock_bh(&ipt_acc_lock); + + DEBUGP("ACCOUNT: ipt_acc_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_acc_tables[i].name, info->table_name, + ACCOUNT_TABLE_NAME_LEN) == 0) { + DEBUGP("ACCOUNT: Found table at slot: %d\n", i); + + ipt_acc_tables[i].refcount--; + DEBUGP("ACCOUNT: Refcount left: %d\n", + ipt_acc_tables[i].refcount); + + /* Table not needed anymore? */ + if (ipt_acc_tables[i].refcount == 0) { + DEBUGP("ACCOUNT: Destroying table at slot: %d\n", i); + ipt_acc_data_free(ipt_acc_tables[i].data, + ipt_acc_tables[i].depth); + memset(&ipt_acc_tables[i], 0, + sizeof(struct ipt_acc_table)); + } + + spin_unlock_bh(&ipt_acc_lock); + return; + } + } + + /* Table not found */ + printk("ACCOUNT: Table %s not found for destroy\n", info->table_name); + spin_unlock_bh(&ipt_acc_lock); +} + +static void ipt_acc_depth0_insert(struct ipt_acc_mask_24 *mask_24, + u_int32_t net_ip, u_int32_t netmask, + u_int32_t src_ip, u_int32_t dst_ip, + u_int32_t size, u_int32_t *itemcount) +{ + unsigned char is_src = 0, is_dst = 0, src_slot, dst_slot; + char is_src_new_ip = 0, is_dst_new_ip = 0; /* Check if this entry is new */ + + DEBUGP("ACCOUNT: ipt_acc_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; + } + + /* Calculate array positions */ + src_slot = (unsigned char)((src_ip&0xFF000000) >> 24); + 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); +} + +static void ipt_acc_depth1_insert(struct ipt_acc_mask_16 *mask_16, + u_int32_t net_ip, u_int32_t netmask, + u_int32_t src_ip, u_int32_t dst_ip, + u_int32_t size, u_int32_t *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_ATOMIC)) == NULL) { + printk("ACCOUNT: Can't process packet because out of memory!\n"); + return; + } + + ipt_acc_depth0_insert((struct ipt_acc_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_ATOMIC)) == NULL) { + printk("ACCOUT: Can't process packet because out of memory!\n"); + return; + } + + ipt_acc_depth0_insert((struct ipt_acc_mask_24 *)mask_16->mask_24[slot], + net_ip, netmask, 0, dst_ip, size, itemcount); + } +} + +static void ipt_acc_depth2_insert(struct ipt_acc_mask_8 *mask_8, + u_int32_t net_ip, u_int32_t netmask, + u_int32_t src_ip, u_int32_t dst_ip, + u_int32_t size, u_int32_t *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_ATOMIC)) == NULL) { + printk("ACCOUNT: Can't process packet because out of memory!\n"); + return; + } + + ipt_acc_depth1_insert((struct ipt_acc_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_ATOMIC)) == NULL) { + printk("ACCOUNT: Can't process packet because out of memory!\n"); + return; + } + + ipt_acc_depth1_insert((struct ipt_acc_mask_16 *)mask_8->mask_16[slot], + net_ip, netmask, 0, dst_ip, size, itemcount); + } +} + +static unsigned int ipt_acc_target(struct sk_buff **pskb, + const struct net_device *in, + const struct net_device *out, + unsigned int hooknum, + const void *targinfo, + void *userinfo) +{ + const struct ipt_acc_info *info = + (const struct ipt_acc_info *)targinfo; + u_int32_t src_ip = (*pskb)->nh.iph->saddr; + u_int32_t dst_ip = (*pskb)->nh.iph->daddr; + u_int32_t size = ntohs((*pskb)->nh.iph->tot_len); + + spin_lock_bh(&ipt_acc_lock); + + if (ipt_acc_tables[info->table_nr].name[0] == 0) { + printk("ACCOUNT: ipt_acc_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_acc_lock); + return IPT_CONTINUE; + } + + /* 8 bit network or "any" network */ + if (ipt_acc_tables[info->table_nr].depth == 0) { + /* Count packet and check if the IP is new */ + ipt_acc_depth0_insert( + (struct ipt_acc_mask_24 *)ipt_acc_tables[info->table_nr].data, + ipt_acc_tables[info->table_nr].ip, + ipt_acc_tables[info->table_nr].netmask, + src_ip, dst_ip, size, &ipt_acc_tables[info->table_nr].itemcount); + spin_unlock_bh(&ipt_acc_lock); + return IPT_CONTINUE; + } + + /* 16 bit network */ + if (ipt_acc_tables[info->table_nr].depth == 1) { + ipt_acc_depth1_insert( + (struct ipt_acc_mask_16 *)ipt_acc_tables[info->table_nr].data, + ipt_acc_tables[info->table_nr].ip, + ipt_acc_tables[info->table_nr].netmask, + src_ip, dst_ip, size, &ipt_acc_tables[info->table_nr].itemcount); + spin_unlock_bh(&ipt_acc_lock); + return IPT_CONTINUE; + } + + /* 24 bit network */ + if (ipt_acc_tables[info->table_nr].depth == 2) { + ipt_acc_depth2_insert( + (struct ipt_acc_mask_8 *)ipt_acc_tables[info->table_nr].data, + ipt_acc_tables[info->table_nr].ip, + ipt_acc_tables[info->table_nr].netmask, + src_ip, dst_ip, size, &ipt_acc_tables[info->table_nr].itemcount); + spin_unlock_bh(&ipt_acc_lock); + return IPT_CONTINUE; + } + + printk("ACCOUNT: ipt_acc_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_acc_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. +*/ +static int ipt_acc_handle_find_slot(void) +{ + u_int32_t i; + /* Insert new table */ + for (i = 0; i < ACCOUNT_MAX_HANDLES; i++) { + /* Found free slot */ + if (ipt_acc_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; +} + +static int ipt_acc_handle_free(u_int32_t handle) +{ + if (handle >= ACCOUNT_MAX_HANDLES) { + printk("ACCOUNT: Invalid handle for ipt_acc_handle_free() specified:" + " %u\n", handle); + return -EINVAL; + } + + ipt_acc_data_free(ipt_acc_handles[handle].data, + ipt_acc_handles[handle].depth); + memset (&ipt_acc_handles[handle], 0, sizeof (struct ipt_acc_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 */ +static int ipt_acc_handle_prepare_read(char *tablename, + struct ipt_acc_handle *dest, u_int32_t *count) +{ + int table_nr=-1; + unsigned char depth; + + for (table_nr = 0; table_nr < ACCOUNT_MAX_TABLES; table_nr++) + if (strncmp(ipt_acc_tables[table_nr].name, tablename, + ACCOUNT_TABLE_NAME_LEN) == 0) + break; + + if (table_nr == ACCOUNT_MAX_TABLES) { + printk("ACCOUNT: ipt_acc_handle_prepare_read(): " + "Table %s not found\n", tablename); + return -1; + } + + /* Fill up handle structure */ + dest->ip = ipt_acc_tables[table_nr].ip; + dest->depth = ipt_acc_tables[table_nr].depth; + dest->itemcount = ipt_acc_tables[table_nr].itemcount; + + /* allocate "root" table */ + if ((dest->data = (void*)get_zeroed_page(GFP_ATOMIC)) == NULL) { + printk("ACCOUNT: out of memory for root table " + "in ipt_acc_handle_prepare_read()\n"); + return -1; + } + + /* Recursive copy of complete data structure */ + depth = dest->depth; + if (depth == 0) { + memcpy(dest->data, + ipt_acc_tables[table_nr].data, + sizeof(struct ipt_acc_mask_24)); + } else if (depth == 1) { + struct ipt_acc_mask_16 *src_16 = + (struct ipt_acc_mask_16 *)ipt_acc_tables[table_nr].data; + struct ipt_acc_mask_16 *network_16 = + (struct ipt_acc_mask_16 *)dest->data; + u_int32_t b; + + for (b = 0; b <= 255; b++) { + if (src_16->mask_24[b]) { + if ((network_16->mask_24[b] = + (void*)get_zeroed_page(GFP_ATOMIC)) == NULL) { + printk("ACCOUNT: out of memory during copy of 16 bit " + "network in ipt_acc_handle_prepare_read()\n"); + ipt_acc_data_free(dest->data, depth); + return -1; + } + + memcpy(network_16->mask_24[b], src_16->mask_24[b], + sizeof(struct ipt_acc_mask_24)); + } + } + } else if(depth == 2) { + struct ipt_acc_mask_8 *src_8 = + (struct ipt_acc_mask_8 *)ipt_acc_tables[table_nr].data; + struct ipt_acc_mask_8 *network_8 = + (struct ipt_acc_mask_8 *)dest->data; + struct ipt_acc_mask_16 *src_16, *network_16; + u_int32_t a, b; + + for (a = 0; a <= 255; a++) { + if (src_8->mask_16[a]) { + if ((network_8->mask_16[a] = + (void*)get_zeroed_page(GFP_ATOMIC)) == NULL) { + printk("ACCOUNT: out of memory during copy of 24 bit network" + " in ipt_acc_handle_prepare_read()\n"); + ipt_acc_data_free(dest->data, depth); + return -1; + } + + memcpy(network_8->mask_16[a], src_8->mask_16[a], + sizeof(struct ipt_acc_mask_16)); + + src_16 = src_8->mask_16[a]; + network_16 = network_8->mask_16[a]; + + for (b = 0; b <= 255; b++) { + if (src_16->mask_24[b]) { + if ((network_16->mask_24[b] = + (void*)get_zeroed_page(GFP_ATOMIC)) == NULL) { + printk("ACCOUNT: out of memory during copy of 16 bit" + " network in ipt_acc_handle_prepare_read()\n"); + ipt_acc_data_free(dest->data, depth); + return -1; + } + + memcpy(network_16->mask_24[b], src_16->mask_24[b], + sizeof(struct ipt_acc_mask_24)); + } + } + } + } + } + + *count = ipt_acc_tables[table_nr].itemcount; + + return 0; +} + +/* Prepare data for read and flush it */ +static int ipt_acc_handle_prepare_read_flush(char *tablename, + struct ipt_acc_handle *dest, u_int32_t *count) +{ + int table_nr; + void *new_data_page; + + for (table_nr = 0; table_nr < ACCOUNT_MAX_TABLES; table_nr++) + if (strncmp(ipt_acc_tables[table_nr].name, tablename, + ACCOUNT_TABLE_NAME_LEN) == 0) + break; + + if (table_nr == ACCOUNT_MAX_TABLES) { + printk("ACCOUNT: ipt_acc_handle_prepare_read_flush(): " + "Table %s not found\n", tablename); + return -1; + } + + /* Try to allocate memory */ + if (!(new_data_page = (void*)get_zeroed_page(GFP_ATOMIC))) { + printk("ACCOUNT: ipt_acc_handle_prepare_read_flush(): " + "Out of memory!\n"); + return -1; + } + + /* Fill up handle structure */ + dest->ip = ipt_acc_tables[table_nr].ip; + dest->depth = ipt_acc_tables[table_nr].depth; + dest->itemcount = ipt_acc_tables[table_nr].itemcount; + dest->data = ipt_acc_tables[table_nr].data; + *count = ipt_acc_tables[table_nr].itemcount; + + /* "Flush" table data */ + ipt_acc_tables[table_nr].data = new_data_page; + ipt_acc_tables[table_nr].itemcount = 0; + + return 0; +} + +/* Copy 8 bit network data into a prepared buffer. + We only copy entries != 0 to increase performance. +*/ +static int ipt_acc_handle_copy_data(void *to_user, u_int32_t *to_user_pos, + u_int32_t *tmpbuf_pos, + struct ipt_acc_mask_24 *data, + u_int32_t net_ip, u_int32_t net_OR_mask) +{ + struct ipt_acc_handle_ip handle_ip; + u_int32_t handle_ip_size = sizeof (struct ipt_acc_handle_ip); + u_int32_t i; + + for (i = 0; i <= 255; i++) { + if (data->ip[i].src_packets || data->ip[i].dst_packets) { + handle_ip.ip = net_ip | net_OR_mask | (i<<24); + + handle_ip.src_packets = data->ip[i].src_packets; + handle_ip.src_bytes = data->ip[i].src_bytes; + handle_ip.dst_packets = data->ip[i].dst_packets; + handle_ip.dst_bytes = data->ip[i].dst_bytes; + + /* Temporary buffer full? Flush to userspace */ + if (*tmpbuf_pos+handle_ip_size >= PAGE_SIZE) { + if (copy_to_user(to_user + *to_user_pos, ipt_acc_tmpbuf, + *tmpbuf_pos)) + return -EFAULT; + *to_user_pos = *to_user_pos + *tmpbuf_pos; + *tmpbuf_pos = 0; + } + memcpy(ipt_acc_tmpbuf+*tmpbuf_pos, &handle_ip, handle_ip_size); + *tmpbuf_pos += handle_ip_size; + } + } + + return 0; +} + +/* Copy the data from our internal structure + We only copy entries != 0 to increase performance. + Overwrites ipt_acc_tmpbuf. +*/ +static int ipt_acc_handle_get_data(u_int32_t handle, void *to_user) +{ + u_int32_t to_user_pos=0, tmpbuf_pos=0, net_ip; + unsigned char depth; + + if (handle >= ACCOUNT_MAX_HANDLES) { + printk("ACCOUNT: invalid handle for ipt_acc_handle_get_data() " + "specified: %u\n", handle); + return -1; + } + + if (ipt_acc_handles[handle].data == NULL) { + printk("ACCOUNT: handle %u is BROKEN: Contains no data\n", handle); + return -1; + } + + net_ip = ipt_acc_handles[handle].ip; + depth = ipt_acc_handles[handle].depth; + + /* 8 bit network */ + if (depth == 0) { + struct ipt_acc_mask_24 *network = + (struct ipt_acc_mask_24*)ipt_acc_handles[handle].data; + if (ipt_acc_handle_copy_data(to_user, &to_user_pos, &tmpbuf_pos, + network, net_ip, 0)) + return -1; + + /* Flush remaining data to userspace */ + if (tmpbuf_pos) + if (copy_to_user(to_user+to_user_pos, ipt_acc_tmpbuf, tmpbuf_pos)) + return -1; + + return 0; + } + + /* 16 bit network */ + if (depth == 1) { + struct ipt_acc_mask_16 *network_16 = + (struct ipt_acc_mask_16*)ipt_acc_handles[handle].data; + u_int32_t b; + for (b = 0; b <= 255; b++) { + if (network_16->mask_24[b]) { + struct ipt_acc_mask_24 *network = + (struct ipt_acc_mask_24*)network_16->mask_24[b]; + if (ipt_acc_handle_copy_data(to_user, &to_user_pos, + &tmpbuf_pos, network, net_ip, (b << 16))) + return -1; + } + } + + /* Flush remaining data to userspace */ + if (tmpbuf_pos) + if (copy_to_user(to_user+to_user_pos, ipt_acc_tmpbuf, tmpbuf_pos)) + return -1; + + return 0; + } + + /* 24 bit network */ + if (depth == 2) { + struct ipt_acc_mask_8 *network_8 = + (struct ipt_acc_mask_8*)ipt_acc_handles[handle].data; + u_int32_t a, b; + for (a = 0; a <= 255; a++) { + if (network_8->mask_16[a]) { + struct ipt_acc_mask_16 *network_16 = + (struct ipt_acc_mask_16*)network_8->mask_16[a]; + for (b = 0; b <= 255; b++) { + if (network_16->mask_24[b]) { + struct ipt_acc_mask_24 *network = + (struct ipt_acc_mask_24*)network_16->mask_24[b]; + if (ipt_acc_handle_copy_data(to_user, + &to_user_pos, &tmpbuf_pos, + network, net_ip, (a << 8) | (b << 16))) + return -1; + } + } + } + } + + /* Flush remaining data to userspace */ + if (tmpbuf_pos) + if (copy_to_user(to_user+to_user_pos, ipt_acc_tmpbuf, tmpbuf_pos)) + return -1; + + return 0; + } + + return -1; +} + +static int ipt_acc_set_ctl(struct sock *sk, int cmd, + void *user, u_int32_t len) +{ + struct ipt_acc_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_acc_handle_sockopt)) { + printk("ACCOUNT: ipt_acc_set_ctl: wrong data size (%u != %u) " + "for IPT_SO_SET_HANDLE_FREE\n", + len, sizeof(struct ipt_acc_handle_sockopt)); + break; + } + + if (copy_from_user (&handle, user, len)) { + printk("ACCOUNT: ipt_acc_set_ctl: copy_from_user failed for " + "IPT_SO_SET_HANDLE_FREE\n"); + break; + } + + down(&ipt_acc_userspace_mutex); + ret = ipt_acc_handle_free(handle.handle_nr); + up(&ipt_acc_userspace_mutex); + break; + case IPT_SO_SET_ACCOUNT_HANDLE_FREE_ALL: { + u_int32_t i; + down(&ipt_acc_userspace_mutex); + for (i = 0; i < ACCOUNT_MAX_HANDLES; i++) + ipt_acc_handle_free(i); + up(&ipt_acc_userspace_mutex); + ret = 0; + break; + } + default: + printk("ACCOUNT: ipt_acc_set_ctl: unknown request %i\n", cmd); + } + + return ret; +} + +static int ipt_acc_get_ctl(struct sock *sk, int cmd, void *user, int *len) +{ + struct ipt_acc_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: { + struct ipt_acc_handle dest; + + if (*len < sizeof(struct ipt_acc_handle_sockopt)) { + printk("ACCOUNT: ipt_acc_get_ctl: wrong data size (%u != %u) " + "for IPT_SO_GET_ACCOUNT_PREPARE_READ/READ_FLUSH\n", + *len, sizeof(struct ipt_acc_handle_sockopt)); + break; + } + + if (copy_from_user (&handle, user, + sizeof(struct ipt_acc_handle_sockopt))) { + return -EFAULT; + break; + } + + spin_lock_bh(&ipt_acc_lock); + if (cmd == IPT_SO_GET_ACCOUNT_PREPARE_READ_FLUSH) + ret = ipt_acc_handle_prepare_read_flush( + handle.name, &dest, &handle.itemcount); + else + ret = ipt_acc_handle_prepare_read( + handle.name, &dest, &handle.itemcount); + spin_unlock_bh(&ipt_acc_lock); + // Error occured during prepare_read? + if (ret == -1) + return -EINVAL; + + /* Allocate a userspace handle */ + down(&ipt_acc_userspace_mutex); + if ((handle.handle_nr = ipt_acc_handle_find_slot()) == -1) { + ipt_acc_data_free(dest.data, dest.depth); + up(&ipt_acc_userspace_mutex); + return -EINVAL; + } + memcpy(&ipt_acc_handles[handle.handle_nr], &dest, + sizeof(struct ipt_acc_handle)); + up(&ipt_acc_userspace_mutex); + + if (copy_to_user(user, &handle, + sizeof(struct ipt_acc_handle_sockopt))) { + return -EFAULT; + break; + } + ret = 0; + break; + } + case IPT_SO_GET_ACCOUNT_GET_DATA: + if (*len < sizeof(struct ipt_acc_handle_sockopt)) { + printk("ACCOUNT: ipt_acc_get_ctl: wrong data size (%u != %u)" + " for IPT_SO_GET_ACCOUNT_PREPARE_READ/READ_FLUSH\n", + *len, sizeof(struct ipt_acc_handle_sockopt)); + break; + } + + if (copy_from_user (&handle, user, + sizeof(struct ipt_acc_handle_sockopt))) { + return -EFAULT; + break; + } + + if (handle.handle_nr >= ACCOUNT_MAX_HANDLES) { + return -EINVAL; + break; + } + + if (*len < ipt_acc_handles[handle.handle_nr].itemcount + * sizeof(struct ipt_acc_handle_ip)) { + printk("ACCOUNT: ipt_acc_get_ctl: not enough space (%u < %u)" + " to store data from IPT_SO_GET_ACCOUNT_GET_DATA\n", + *len, ipt_acc_handles[handle.handle_nr].itemcount + * sizeof(struct ipt_acc_handle_ip)); + ret = -ENOMEM; + break; + } + + down(&ipt_acc_userspace_mutex); + ret = ipt_acc_handle_get_data(handle.handle_nr, user); + up(&ipt_acc_userspace_mutex); + if (ret) { + printk("ACCOUNT: ipt_acc_get_ctl: ipt_acc_handle_get_data" + " failed for handle %u\n", handle.handle_nr); + break; + } + + ret = 0; + break; + case IPT_SO_GET_ACCOUNT_GET_HANDLE_USAGE: { + u_int32_t i; + if (*len < sizeof(struct ipt_acc_handle_sockopt)) { + printk("ACCOUNT: ipt_acc_get_ctl: wrong data size (%u != %u)" + " for IPT_SO_GET_ACCOUNT_GET_HANDLE_USAGE\n", + *len, sizeof(struct ipt_acc_handle_sockopt)); + break; + } + + /* Find out how many handles are in use */ + handle.itemcount = 0; + down(&ipt_acc_userspace_mutex); + for (i = 0; i < ACCOUNT_MAX_HANDLES; i++) + if (ipt_acc_handles[i].data) + handle.itemcount++; + up(&ipt_acc_userspace_mutex); + + if (copy_to_user(user, &handle, + sizeof(struct ipt_acc_handle_sockopt))) { + return -EFAULT; + break; + } + ret = 0; + break; + } + case IPT_SO_GET_ACCOUNT_GET_TABLE_NAMES: { + u_int32_t size = 0, i, name_len; + char *tnames; + + spin_lock_bh(&ipt_acc_lock); + + /* Determine size of table names */ + for (i = 0; i < ACCOUNT_MAX_TABLES; i++) { + if (ipt_acc_tables[i].name[0] != 0) + size += strlen (ipt_acc_tables[i].name) + 1; + } + size += 1; /* Terminating NULL character */ + + if (*len < size || size > PAGE_SIZE) { + spin_unlock_bh(&ipt_acc_lock); + printk("ACCOUNT: ipt_acc_get_ctl: not enough space (%u < %u < %lu)" + " to store table names\n", *len, size, PAGE_SIZE); + ret = -ENOMEM; + break; + } + /* Copy table names to userspace */ + tnames = ipt_acc_tmpbuf; + for (i = 0; i < ACCOUNT_MAX_TABLES; i++) { + if (ipt_acc_tables[i].name[0] != 0) { + name_len = strlen (ipt_acc_tables[i].name) + 1; + memcpy(tnames, ipt_acc_tables[i].name, name_len); + tnames += name_len; + } + } + spin_unlock_bh(&ipt_acc_lock); + + /* Terminating NULL character */ + *tnames = 0; + + /* Transfer to userspace */ + if (copy_to_user(user, ipt_acc_tmpbuf, size)) + return -EFAULT; + + ret = 0; + break; + } + default: + printk("ACCOUNT: ipt_acc_get_ctl: unknown request %i\n", cmd); + } + + return ret; +} + +static struct ipt_target ipt_acc_reg = { + .name = "ACCOUNT", + .target = ipt_acc_target, + .checkentry = ipt_acc_checkentry, + .destroy = ipt_acc_deleteentry, + .me = THIS_MODULE +}; + +static struct nf_sockopt_ops ipt_acc_sockopts = { + .pf = PF_INET, + .set_optmin = IPT_SO_SET_ACCOUNT_HANDLE_FREE, + .set_optmax = IPT_SO_SET_ACCOUNT_MAX+1, + .set = ipt_acc_set_ctl, + .get_optmin = IPT_SO_GET_ACCOUNT_PREPARE_READ, + .get_optmax = IPT_SO_GET_ACCOUNT_MAX+1, + .get = ipt_acc_get_ctl +}; + +static int __init init(void) +{ + init_MUTEX(&ipt_acc_userspace_mutex); + + if ((ipt_acc_tables = + kmalloc(ACCOUNT_MAX_TABLES * + sizeof(struct ipt_acc_table), GFP_KERNEL)) == NULL) { + printk("ACCOUNT: Out of memory allocating account_tables structure"); + goto error_cleanup; + } + memset(ipt_acc_tables, 0, + ACCOUNT_MAX_TABLES * sizeof(struct ipt_acc_table)); + + if ((ipt_acc_handles = + kmalloc(ACCOUNT_MAX_HANDLES * + sizeof(struct ipt_acc_handle), GFP_KERNEL)) == NULL) { + printk("ACCOUNT: Out of memory allocating account_handles structure"); + goto error_cleanup; + } + memset(ipt_acc_handles, 0, + ACCOUNT_MAX_HANDLES * sizeof(struct ipt_acc_handle)); + + /* Allocate one page as temporary storage */ + if ((ipt_acc_tmpbuf = (void*)__get_free_page(GFP_KERNEL)) == NULL) { + printk("ACCOUNT: Out of memory for temporary buffer page\n"); + goto error_cleanup; + } + + /* Register setsockopt */ + if (nf_register_sockopt(&ipt_acc_sockopts) < 0) { + printk("ACCOUNT: Can't register sockopts. Aborting\n"); + goto error_cleanup; + } + + if (ipt_register_target(&ipt_acc_reg)) + goto error_cleanup; + + return 0; + +error_cleanup: + if(ipt_acc_tables) + kfree(ipt_acc_tables); + if(ipt_acc_handles) + kfree(ipt_acc_handles); + if (ipt_acc_tmpbuf) + free_page((unsigned long)ipt_acc_tmpbuf); + + return -EINVAL; +} + +static void __exit fini(void) +{ + ipt_unregister_target(&ipt_acc_reg); + + nf_unregister_sockopt(&ipt_acc_sockopts); + + kfree(ipt_acc_tables); + kfree(ipt_acc_handles); + free_page((unsigned long)ipt_acc_tmpbuf); +} + +module_init(init); +module_exit(fini); +MODULE_LICENSE("GPL"); -- 1.7.1