diff options
Diffstat (limited to 'userspace/libebtc/src')
| -rw-r--r-- | userspace/libebtc/src/Makefile.am | 55 | ||||
| -rw-r--r-- | userspace/libebtc/src/Makefile.in | 502 | ||||
| -rw-r--r-- | userspace/libebtc/src/ebtc.c | 2157 |
3 files changed, 2714 insertions, 0 deletions
diff --git a/userspace/libebtc/src/Makefile.am b/userspace/libebtc/src/Makefile.am new file mode 100644 index 0000000..972a012 --- /dev/null +++ b/userspace/libebtc/src/Makefile.am @@ -0,0 +1,55 @@ +# +# ==[ Makefile ]================================================================ +# +# Project +# +# Library for ethernet bridge tables. +# +# +# Description +# +# Process this file with automake to create Makefile.in +# +# +# Copyright +# +# Copyright 2005 by Jens Götze +# All rights reserved. +# +# This program is free software; you can redistribute it and/or modify +# it under the terms of the GNU General Public License as published by +# the Free Software Foundation; either version 2 of the License, or +# (at your option) any later version. +# +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with this program; if not, write to the Free Software +# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, +# USA. +# +# +# ============================================================================== +# + + +LT_CUR = 1 +LT_REV = 0 +LT_AGE = 1 + +MAINTAINERCLEANFILES = Makefile.in + +AM_CFLAGS = @CFLAGS@ -I../include +AM_LDFLAGS = @LDFLAGS@ + +EXTRA_DIST = + +lib_LTLIBRARIES = libebtc.la + +libebtc_la_SOURCES = ebtc.c +libebtc_la_LDFLAGS = -version-info ${LT_CUR}:${LT_REV}:${LT_AGE} + + diff --git a/userspace/libebtc/src/Makefile.in b/userspace/libebtc/src/Makefile.in new file mode 100644 index 0000000..3327e83 --- /dev/null +++ b/userspace/libebtc/src/Makefile.in @@ -0,0 +1,502 @@ +# Makefile.in generated by automake 1.9.3 from Makefile.am. +# @configure_input@ + +# Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, +# 2003, 2004 Free Software Foundation, Inc. +# This Makefile.in is free software; the Free Software Foundation +# gives unlimited permission to copy and/or distribute it, +# with or without modifications, as long as this notice is preserved. + +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY, to the extent permitted by law; without +# even the implied warranty of MERCHANTABILITY or FITNESS FOR A +# PARTICULAR PURPOSE. + +@SET_MAKE@ + +# +# ==[ Makefile ]================================================================ +# +# Project +# +# Library for ethernet bridge tables. +# +# +# Description +# +# Process this file with automake to create Makefile.in +# +# +# Copyright +# +# Copyright 2005 by Jens Götze +# All rights reserved. +# +# This program is free software; you can redistribute it and/or modify +# it under the terms of the GNU General Public License as published by +# the Free Software Foundation; either version 2 of the License, or +# (at your option) any later version. +# +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with this program; if not, write to the Free Software +# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, +# USA. +# +# +# ============================================================================== +# + +SOURCES = $(libebtc_la_SOURCES) + +srcdir = @srcdir@ +top_srcdir = @top_srcdir@ +VPATH = @srcdir@ +pkgdatadir = $(datadir)/@PACKAGE@ +pkglibdir = $(libdir)/@PACKAGE@ +pkgincludedir = $(includedir)/@PACKAGE@ +top_builddir = .. +am__cd = CDPATH="$${ZSH_VERSION+.}$(PATH_SEPARATOR)" && cd +INSTALL = @INSTALL@ +install_sh_DATA = $(install_sh) -c -m 644 +install_sh_PROGRAM = $(install_sh) -c +install_sh_SCRIPT = $(install_sh) -c +INSTALL_HEADER = $(INSTALL_DATA) +transform = $(program_transform_name) +NORMAL_INSTALL = : +PRE_INSTALL = : +POST_INSTALL = : +NORMAL_UNINSTALL = : +PRE_UNINSTALL = : +POST_UNINSTALL = : +build_triplet = @build@ +host_triplet = @host@ +subdir = src +DIST_COMMON = $(srcdir)/Makefile.am $(srcdir)/Makefile.in +ACLOCAL_M4 = $(top_srcdir)/aclocal.m4 +am__aclocal_m4_deps = $(top_srcdir)/configure.in +am__configure_deps = $(am__aclocal_m4_deps) $(CONFIGURE_DEPENDENCIES) \ + $(ACLOCAL_M4) +mkinstalldirs = $(install_sh) -d +CONFIG_HEADER = $(top_builddir)/include/config.h +CONFIG_CLEAN_FILES = +am__vpath_adj_setup = srcdirstrip=`echo "$(srcdir)" | sed 's|.|.|g'`; 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you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, + * USA. + * + * + * ============================================================================= + */ + + +#include <stdio.h> +#include <stdlib.h> +#include <sys/socket.h> +#include <netinet/in.h> +#include <linux/netfilter_bridge/ebtables.h> +#include <libebtc.h> + + +/* Macros */ + +#define SUCCESS 0 +#define ERR_CHAINNOTFOUND 1 +#define ERR_CHAINEXIST 2 +#define ERR_POLICYNOTFOUND 3 +#define ERR_ALLOCATEMEM 4 +#define ERR_RULENUM 5 +#define ERR_BUILTINCHAIN 6 +#define ERR_RAWSOCKET 7 +#define ERR_GETINFO 8 +#define ERR_GETENTRIES 9 +#define ERR_SETENTRIES 10 +#define ERR_SETCOUNTERS 11 +#define ERR_BADENTRY 12 +#define ERR_STDCHAINNOTALLOW 13 +#define ERR_ENTRYTARGETINVALID 14 + + +/* Types */ + +typedef struct rule_list_st rule_list_t; + +typedef struct chain_list_st chain_list_t; + +typedef struct chain2id_st chain2id_t; + + +/* Structures */ + +struct rule_list_st { + + rule_list_t *next; + + /* Payload */ + + struct ebt_entry *entry; + + struct { + + int changed; + + int offset; + + struct ebt_counter counter; + + } counter; + +}; + +struct chain_list_st { + + chain_list_t *next; + + int id; /* used for chain jump */ + + int offset; + + /* Payload */ + + int hookid; + + struct ebt_entries entries; + + struct { + + int count; + + unsigned int size; + + rule_list_t *first; + + rule_list_t *cur; + + rule_list_t *last; + + } rules; + +}; + +struct chain2id_st { + + const char name[EBT_CHAIN_MAXNAMELEN]; + + int id; + +}; + +struct ebtc_handle_st { + + /* Communication backend to kernel */ + + int fd; + + struct ebt_replace replace; + + /* Errorhandling */ + + unsigned int error_no; + + /* Cache */ + + struct { + + unsigned int num_counters; + + } cache; + + /* Payload */ + + int changed; + + struct { + + int count; + + int last_id; + + chain_list_t *first; + + chain_list_t *cur; + + chain_list_t *last; + + } chains; + +}; + + +/* Global variables */ + +static chain2id_t targets[] = { + { "ACCEPT", EBT_ACCEPT }, + { "DROP", EBT_DROP }, + { "CONTINUE", EBT_CONTINUE }, + { "RETURN", EBT_RETURN }, + { "", 0 } +}; + +static chain2id_t builtinchains[] = { + { "PREROUTING", NF_BR_PRE_ROUTING, }, + { "INPUT", NF_BR_LOCAL_IN }, + { "FORWARD", NF_BR_FORWARD }, + { "OUTPUT", NF_BR_LOCAL_OUT }, + { "POSTROUTING", NF_BR_POST_ROUTING, }, + { "BROUTING", NF_BR_BROUTING, }, + { "", 0 } +}; + +static struct { + + unsigned int id; + + char *msg; + +} error_msg[] = { + { SUCCESS, "success" }, + { ERR_CHAINNOTFOUND, "chain not found" }, + { ERR_CHAINEXIST, "chain already exist" }, + { ERR_POLICYNOTFOUND, "policy not exist" }, + { ERR_ALLOCATEMEM, "can't allocate memory" }, + { ERR_RULENUM, "rule number is out of range" }, + { ERR_BUILTINCHAIN, "delete denied this chain is a builtin chain" }, + { ERR_RAWSOCKET, "can't open raw socket" }, + { ERR_GETINFO, "can't get informations" }, + { ERR_GETENTRIES, "can't get entries" }, + { ERR_SETENTRIES, "can't set entries" }, + { ERR_SETCOUNTERS, "can't set counters" }, + { ERR_BADENTRY, "entry is not valid" }, + { ERR_STDCHAINNOTALLOW, "standard chain is not allowed" }, + { ERR_ENTRYTARGETINVALID, "target of entry is invalid" } +}; + +static struct { + + /* Errorhandling */ + + unsigned int error_no; + +} self_private; + + +static chain_list_t *find_chain (const char *chainname, + const ebtc_handle_t handle) +{ + +/* ---- VAR ---- */ + + chain_list_t *chain = handle->chains.first; + + + +/* ---- CODE ---- */ + + for (; chain; chain = chain->next) { + + if (!strcmp(chain->entries.name, chainname)) + return chain; + + } + + return NULL; + +} + + +static int check_entry (const ebt_entry_t *entry) +{ + +/* ---- VAR ---- */ + + ebt_standard_target_t *std_target; + + ebt_entry_target_t *target; + + + +/* ---- CODE ---- */ + + if (!(entry->bitmask & EBT_ENTRY_OR_ENTRIES)) + return -1; + + /* Check offsets */ + + if (!entry->watchers_offset) + return -1; + + if (!entry->target_offset) + return -1; + + if (!entry->next_offset) + return -1; + + if (entry->watchers_offset > entry->target_offset) + return -1; + + if (entry->target_offset > entry->next_offset) + return -1; + + return 0; + +} + + +int ebtc_is_chain (const char *chainname, const ebtc_handle_t handle) +{ + +/* ---- CODE ---- */ + + return find_chain(chainname, handle) ? 0 : -1; + +} + + +const char *ebtc_first_chain (ebtc_handle_t *handle) +{ + +/* ---- VAR ---- */ + + chain_list_t *chain; + + + +/* ---- CODE ---- */ + + (*handle)->chains.cur = chain = (*handle)->chains.first; + + return chain->entries.name; + +} + + +const char *ebtc_next_chain (ebtc_handle_t *handle) +{ + +/* ---- VAR ---- */ + + chain_list_t *chain; + + + +/* ---- CODE ---- */ + + chain = (*handle)->chains.cur; + + if (!chain) + return NULL; + + (*handle)->chains.cur = chain = chain->next; + + return chain ? chain->entries.name : NULL; + +} + + +const struct ebt_entry *ebtc_first_rule (const char *chainname, + ebtc_handle_t *handle) +{ + +/* ---- VAR ---- */ + + chain_list_t *chain; + + rule_list_t *rule; + + + +/* ---- CODE ---- */ + + chain = find_chain(chainname, *handle); + + if (!chain) { + + (*handle)->error_no = ERR_CHAINNOTFOUND; + + return NULL; + + } + + rule = chain->rules.cur = chain->rules.first; + + return rule ? rule->entry : NULL; + +} + + +const struct ebt_entry *ebtc_next_rule (const char *chainname, + ebtc_handle_t *handle) +{ + +/* ---- VAR ---- */ + + chain_list_t *chain; + + rule_list_t *rule; + + + +/* ---- CODE ---- */ + + chain = find_chain(chainname, *handle); + + if (!chain) { + + (*handle)->error_no = ERR_CHAINNOTFOUND; + + return NULL; + + } + + if (!chain->rules.cur) + return NULL; + + rule = chain->rules.cur = chain->rules.cur->next; + + (*handle)->error_no = SUCCESS; + + return rule ? rule->entry : NULL; + +} + + +const char *ebtc_get_target (const struct ebt_entry *entry, + const ebtc_handle_t *handle) +{ + +/* ---- VAR ---- */ + + char *ptr; + + ebt_entry_target_t *target; + + ebt_standard_target_t *std_target; + + chain2id_t *chain2id; + + + +/* ---- CODE ---- */ + + ptr = (char *)entry; + ptr += entry->target_offset; + + target = (struct ebt_entry_target *)ptr; + + if (strcmp(target->u.name, "standard")) + return target->u.name; + + /* Convert id to ascii */ + + std_target = (ebt_standard_target_t *)target; + + for (chain2id = targets; *chain2id->name; chain2id++) { + + if (std_target->verdict == chain2id->id) + return chain2id->name; + + } + + return NULL; + +} + + +int ebtc_is_builtin (const char *chainname, const ebtc_handle_t *handle) +{ + +/* ---- VAR ---- */ + + chain_list_t *chain; + + + +/* ---- CODE ---- */ + + chain = find_chain(chainname, *handle); + + if (!chain) + return -1; + + return chain->hookid == NF_BR_NUMHOOKS ? -1 : 0; + +} + + +int ebtc_set_policy (const char *chainname, const char *policy, + ebtc_handle_t *handle) +{ + +/* ---- VAR ---- */ + + int i; + + int id = 0; + + chain_list_t *chain = (*handle)->chains.first; + + + +/* ---- CODE ---- */ + + /* Transform policy to id */ + + for (i = 0; ; i++) { + + if (!*targets[i].name) { + + (*handle)->error_no = ERR_POLICYNOTFOUND; + + return -1; + + } + + if (!strcmp(policy, targets[i].name)) { + + id = targets[i].id; + break; + + } + + } + + /* Search chain and set policy */ + + chain = find_chain(chainname, *handle); + + if (!chain) { + + (*handle)->error_no = ERR_CHAINNOTFOUND; + + return -1; + + } + + if (chain->entries.policy != id) { + + chain->entries.policy = id; + (*handle)->changed = EBTC_TRUE; + + } + + (*handle)->error_no = SUCCESS; + + return 0; + +} + + +const char *ebtc_get_policy (const char *chainname, const ebtc_handle_t *handle) +{ + +/* ---- VAR ---- */ + + int i; + + chain_list_t *chain; + + chain2id_t *chain2id; + + + +/* ---- CODE ---- */ + + /* Find chain */ + + chain = find_chain(chainname, *handle); + + if (!chain) { + + (*handle)->error_no = ERR_CHAINNOTFOUND; + + return NULL; + + } + + /* Convert id to ascii */ + + for (chain2id = targets; *chain2id->name; chain2id++) { + + if (chain->entries.policy == chain2id->id) { + + (*handle)->error_no = SUCCESS; + + return chain2id->name; + + } + + } + + return NULL; + +} + + +int ebtc_insert_entry (const char *chainname, const struct ebt_entry *entry, + unsigned int rulenum, ebtc_handle_t *handle) +{ + +/* ---- VAR ---- */ + + chain_list_t *chain; + + rule_list_t *rule_last = NULL; + + rule_list_t *rule_cur; + + rule_list_t *rule; + + unsigned int size; + + + +/* ---- CODE ---- */ + + if (check_entry(entry)) { + + (*handle)->error_no = ERR_BADENTRY; + + return -1; + + } + + /* Search for chain in chain list */ + + chain = find_chain(chainname, *handle); + + if (!chain) { + + (*handle)->error_no = ERR_CHAINNOTFOUND; + + return -1; + + } + + /* Copy entry and append to chain */ + + size = sizeof(rule_list_t) + entry->next_offset; + rule = (rule_list_t *)malloc(size); + + if (!rule) { + + (*handle)->error_no = ERR_ALLOCATEMEM; + + return -1; + + } + + memset(rule, 0, size); + + rule->entry = (ebt_entry_t *)(rule + 1); + memcpy(rule->entry, entry, entry->next_offset); + + rule_cur = chain->rules.first; + + if (rule_cur) { + + for (; rulenum > 0 && rule_cur; rulenum--) { + + rule_last = rule_cur; + rule_cur = rule_cur->next; + + } + + if (rulenum || !rule_cur) { + + (*handle)->error_no = ERR_RULENUM; + + return -1; + + } + + if (rule_last) + rule_last->next = rule; + else + chain->rules.first = rule; + + rule->next = rule_cur; + + } else { + + if (rulenum != 0) { + + (*handle)->error_no = ERR_RULENUM; + + return -1; + + } + + chain->rules.first = chain->rules.last = rule; + + } + + chain->rules.count++; + chain->rules.size += entry->next_offset; + + (*handle)->changed = EBTC_TRUE; + (*handle)->error_no = SUCCESS; + + return 0; + +} + + +int ebtc_replace_entry (const char *chainname, const struct ebt_entry *entry, + unsigned int rulenum, ebtc_handle_t *handle) +{ + +/* ---- VAR ---- */ + + chain_list_t *chain; + + rule_list_t *rule_last = NULL; + + rule_list_t *rule_old; + + rule_list_t *rule_new; + + unsigned int size; + + + +/* ---- CODE ---- */ + + if (check_entry(entry)) { + + (*handle)->error_no = ERR_BADENTRY; + + return -1; + + } + + /* Search for chain in chain list */ + + chain = find_chain(chainname, *handle); + + if (!chain) { + + (*handle)->error_no = ERR_CHAINNOTFOUND; + + return -1; + + } + + /* Copy entry and replace in chain */ + + size = sizeof(rule_list_t) + entry->next_offset; + rule_new = (rule_list_t *)malloc(size); + + if (!rule_new) { + + (*handle)->error_no = ERR_ALLOCATEMEM; + + return -1; + + } + + memset(rule_new, 0, size); + + rule_new->entry = (ebt_entry_t *)(rule_new + 1); + memcpy(rule_new->entry, entry, entry->next_offset); + + rule_old = chain->rules.first; + + if (!rule_old) { + + (*handle)->error_no = ERR_RULENUM; + + return -1; + + } + + for (; rulenum > 0 && rule_old; rulenum--) { + + rule_last = rule_old; + rule_old = rule_old->next; + + } + + if (rulenum || !rule_old) { + + (*handle)->error_no = ERR_RULENUM; + + return -1; + + } + + if (rule_last) + rule_last->next = rule_new; + else + chain->rules.first = rule_new; + + rule_new->next = rule_old->next; + + if (!rule_new->next) + chain->rules.last = rule_new; + + chain->rules.size -= rule_old->entry->next_offset; + chain->rules.size += entry->next_offset; + + (*handle)->changed = EBTC_TRUE; + + /* Clean up */ + + free(rule_old); + + (*handle)->error_no = SUCCESS; + + return 0; + +} + + +int ebtc_append_entry (const char *chainname, const struct ebt_entry *entry, + ebtc_handle_t *handle) +{ + +/* ---- VAR ---- */ + + chain_list_t *chain = (*handle)->chains.first; + + rule_list_t *rule; + + unsigned int size; + + + +/* ---- CODE ---- */ + + if (check_entry(entry)) { + + (*handle)->error_no = ERR_BADENTRY; + + return -1; + + } + + /* Search for chain in chain list */ + + while (chain) { + + if (!strcmp(chain->entries.name, chainname)) + break; + + chain = chain->next; + + } + + if (!chain) { + + (*handle)->error_no = ERR_CHAINNOTFOUND; + + return -1; + + } + + /* Copy entry and insert into chain */ + + size = sizeof(rule_list_t) + entry->next_offset; + rule = (rule_list_t *)malloc(size); + + if (!rule) { + + (*handle)->error_no = ERR_ALLOCATEMEM; + + return -1; + + } + + memset(rule, 0, size); + + rule->entry = (ebt_entry_t *)(rule + 1); + memcpy(rule->entry, entry, entry->next_offset); + + if (chain->rules.last) { + + chain->rules.last->next = rule; + chain->rules.last = rule; + + } else + chain->rules.first = chain->rules.last = rule; + + chain->rules.count++; + chain->rules.size += entry->next_offset; + + (*handle)->changed = EBTC_TRUE; + (*handle)->error_no = SUCCESS; + + return 0; + +} + + +int ebtc_delete_entry (const char *chainname, unsigned int rulenum, + ebtc_handle_t *handle) +{ + +/* ---- VAR ---- */ + + chain_list_t *chain; + + rule_list_t *rule_last = NULL; + + rule_list_t *rule; + + + +/* ---- CODE ---- */ + + /* Find chain */ + + chain = find_chain(chainname, *handle); + + if (!chain) { + + (*handle)->error_no = ERR_CHAINNOTFOUND; + + return -1; + + } + + /* Find and delete rule */ + + rule = chain->rules.first; + + if (!rule) { + + (*handle)->error_no = ERR_RULENUM; + + return -1; + + } + + for (; rulenum > 0 && rule; rulenum--) { + + rule_last = rule; + rule = rule->next; + + } + + if (rulenum || !rule) { + + (*handle)->error_no = ERR_RULENUM; + + return -1; + + } + + if (rule_last) + rule_last->next = rule->next; + else + chain->rules.first = rule->next; + + if (!rule->next) + chain->rules.last = rule_last; + + chain->rules.count--; + chain->rules.size -= rule->entry->next_offset; + + (*handle)->changed = EBTC_TRUE; + + /* Clean up */ + + free(rule); + + (*handle)->error_no = SUCCESS; + + return 0; + +} + + +int ebtc_flush_entries (const char *chainname, ebtc_handle_t *handle) +{ + +/* ---- VAR ---- */ + + chain_list_t *chain; + + rule_list_t *rule; + + rule_list_t *rule_next; + + + +/* ---- CODE ---- */ + + /* Find chain */ + + chain = find_chain(chainname, *handle); + + if (!chain) { + + (*handle)->error_no = ERR_CHAINNOTFOUND; + + return -1; + + } + + /* Free all rules */ + + rule = chain->rules.first; + + while (rule) { + + rule_next = rule->next; + + free(rule); + + rule = rule_next; + + } + + memset(&chain->rules, 0, sizeof(chain->rules)); + + (*handle)->changed = EBTC_TRUE; + (*handle)->error_no = SUCCESS; + + return 0; + +} + + +int ebtc_zero_entries (const char *chainname, ebtc_handle_t *handle) +{ + +/* ---- VAR ---- */ + + chain_list_t *chain; + + rule_list_t *rule; + + + +/* ---- CODE ---- */ + + /* Find chain */ + + chain = find_chain(chainname, *handle); + + if (!chain) { + + (*handle)->error_no = ERR_CHAINNOTFOUND; + + return -1; + + } + + /* Iterate set zero in rule list */ + + rule = chain->rules.first; + + while (rule) { + + memset(&rule->counter.counter, 0, sizeof(ebt_counter_t)); + rule->counter.changed = EBTC_TRUE; + + rule = rule->next; + + } + + (*handle)->changed = EBTC_TRUE; + (*handle)->error_no = SUCCESS; + + return 0; + +} + + +int ebtc_rename_chain (const char *chainname_old, const char *chainname_new, + ebtc_handle_t *handle) +{ + +/* ---- VAR ---- */ + + chain_list_t *chain; + + + +/* ---- CODE ---- */ + + /* Find chain */ + + chain = find_chain(chainname_old, *handle); + + if (!chain) { + + (*handle)->error_no = ERR_CHAINNOTFOUND; + + return -1; + + } + + if (chain->hookid != NF_BR_NUMHOOKS) { + + (*handle)->error_no = ERR_BUILTINCHAIN; + + return -1; + + } + + /* Set new chainname */ + + snprintf(chain->entries.name, EBT_CHAIN_MAXNAMELEN, "%s", chainname_new); + + (*handle)->changed = EBTC_TRUE; + + return 0; + +} + + +int ebtc_create_chain (const char *chainname, ebtc_handle_t *handle) +{ + +/* ---- VAR ---- */ + + chain_list_t *chain; + + + +/* ---- CODE ---- */ + + /* Exist chain */ + + chain = find_chain(chainname, *handle); + + if (chain) { + + (*handle)->error_no = ERR_CHAINEXIST; + + return -1; + + } + + /* Allocate new chain */ + + chain = (chain_list_t *)malloc(sizeof(chain_list_t)); + + if (!chain) { + + (*handle)->error_no = ERR_ALLOCATEMEM; + + return -1; + + } + + memset(chain, 0, sizeof(chain_list_t)); + + chain->hookid = NF_BR_NUMHOOKS; + chain->id = (*handle)->chains.last_id++; + + snprintf(chain->entries.name, EBT_CHAIN_MAXNAMELEN, "%s", chainname); + chain->entries.policy = EBT_ACCEPT; + + if ((*handle)->chains.last) { + + (*handle)->chains.last->next = chain; + (*handle)->chains.last = chain; + + } else + (*handle)->chains.last = (*handle)->chains.first = chain; + + (*handle)->changed = EBTC_TRUE; + (*handle)->error_no = SUCCESS; + + return 0; + +} + + +int ebtc_delete_chain (const char *chainname, ebtc_handle_t *handle) +{ + +/* ---- VAR ---- */ + + chain_list_t *chain = (*handle)->chains.first; + + chain_list_t *chain_last = NULL; + + rule_list_t *rule; + + rule_list_t *rule_next; + + + +/* ---- CODE ---- */ + + /* Find chain */ + + for (; chain; chain_last = chain, chain = chain->next) { + + if (!strcmp(chain->entries.name, chainname)) + break; + + } + + if (!chain) { + + (*handle)->error_no = ERR_CHAINNOTFOUND; + + return -1; + + } + + if (chain->hookid != NF_BR_NUMHOOKS) { + + (*handle)->error_no = ERR_BUILTINCHAIN; + + return -1; + + } + + /* Free all rules */ + + rule = chain->rules.first; + + while (rule) { + + rule_next = rule->next; + + free(rule); + + rule = rule_next; + + } + + /* Remove chain from list */ + + if (chain_last) + chain_last->next = chain->next; + else + (*handle)->chains.first = chain->next; + + if (!chain->next) + (*handle)->chains.last = chain_last; + + (*handle)->changed = EBTC_TRUE; + (*handle)->error_no = SUCCESS; + + /* Clean up */ + + free(chain); + + return 0; + +} + + +const struct ebt_counter *ebtc_read_counter (const char *chainname, + unsigned int rulenum, + ebtc_handle_t *handle) +{ + +/* ---- VAR ---- */ + + chain_list_t *chain; + + rule_list_t *rule; + + + +/* ---- CODE ---- */ + + /* Find chain */ + + chain = find_chain(chainname, *handle); + + if (!chain) { + + (*handle)->error_no = ERR_CHAINNOTFOUND; + + return NULL; + + } + + /* Find rule */ + + rule = chain->rules.first; + + for (; rulenum > 0 && rule; rulenum--) + rule = rule->next; + + if (rulenum || !rule) { + + (*handle)->error_no = ERR_RULENUM; + + return NULL; + + } + + (*handle)->error_no = SUCCESS; + + return &rule->counter.counter; + +} + + +int ebtc_zero_counter (const char *chainname, unsigned int rulenum, + ebtc_handle_t *handle) +{ + +/* ---- VAR ---- */ + + chain_list_t *chain; + + rule_list_t *rule; + + + +/* ---- CODE ---- */ + + /* Find chain */ + + chain = find_chain(chainname, *handle); + + if (!chain) { + + (*handle)->error_no = ERR_CHAINNOTFOUND; + + return -1; + + } + + /* Find rule */ + + rule = chain->rules.first; + + for (; rulenum > 0 && rule; rulenum--) + rule = rule->next; + + if (rulenum || !rule) { + + (*handle)->error_no = ERR_RULENUM; + + return -1; + + } + + memset(&rule->counter.counter, 0, sizeof(ebt_counter_t)); + rule->counter.changed = EBTC_TRUE; + + (*handle)->changed = EBTC_TRUE; + (*handle)->error_no = SUCCESS; + + return 0; + +} + + +int ebtc_set_counter (const char *chainname, unsigned int rulenum, + const struct ebt_counter *counter, ebtc_handle_t *handle) +{ + +/* ---- VAR ---- */ + + chain_list_t *chain; + + rule_list_t *rule; + + + +/* ---- CODE ---- */ + + /* Find chain */ + + chain = find_chain(chainname, *handle); + + if (!chain) { + + (*handle)->error_no = ERR_CHAINNOTFOUND; + + return -1; + + } + + /* Find rule */ + + rule = chain->rules.first; + + for (; rulenum > 0 && rule; rulenum--) + rule = rule->next; + + if (rulenum || !rule) { + + (*handle)->error_no = ERR_RULENUM; + + return -1; + + } + + memcpy(&rule->counter.counter, counter, sizeof(ebt_counter_t)); + rule->counter.changed = EBTC_TRUE; + + (*handle)->changed = EBTC_TRUE; + (*handle)->error_no = SUCCESS; + + return 0; + +} + + +int ebtc_target_jumptochain (ebt_standard_target_t *target, char *chainname, + ebtc_handle_t *handle) +{ + +/* ---- VAR ---- */ + + int i; + + chain_list_t *chain; + + + +/* ---- CODE ---- */ + + /* Prepare basics of target */ + + target->target.target_size = EBTC_SIZEOF(ebt_standard_target_t); + target->target.target_size -= EBTC_SIZEOF(ebt_entry_target_t); + + snprintf(target->target.u.name, EBT_FUNCTION_MAXNAMELEN, "standard"); + + /* Check for standard targets */ + + for (i = 0; *targets[i].name; i++) { + + if (!strcmp(chainname, targets[i].name)) { + + target->verdict = targets[i].id; + + return 0; + + } + + } + + /* Check for standard targets */ + + for (i = 0; *targets[i].name; i++) { + + if (!strcmp(chainname, targets[i].name)) { + + target->verdict = targets[i].id; + + return 0; + + } + + } + + /* Find chain */ + + chain = find_chain(chainname, *handle); + + if (!chain) { + + (*handle)->error_no = ERR_CHAINNOTFOUND; + + return -1; + + } + + if (chain->hookid != NF_BR_NUMHOOKS) { + + (*handle)->error_no = ERR_STDCHAINNOTALLOW; + + return -1; + + } + + target->verdict = chain->id; + + return 0; + +} + + +ebtc_handle_t ebtc_init (const char *tablename, int options) +{ + +/* ---- VAR ---- */ + + int i; + + int optlen; + + int optname; + + int counter; + + unsigned int size; + + unsigned int entry_count; + + unsigned int rule_size; + + ebt_replace_t *replace; + + ebt_entries_t *entries; + + ebt_entry_t *entry; + + chain_list_t *chain; + + rule_list_t *rule; + + ebtc_handle_t handle; + + + +/* ---- CODE ---- */ + + /* Allocate memory for handle and initialize this object */ + + handle = (ebtc_handle_t)malloc(sizeof(struct ebtc_handle_st)); + + if (!handle) { + + self_private.error_no = ERR_ALLOCATEMEM; + + return NULL; + + } + + memset(handle, 0, sizeof(struct ebtc_handle_st)); + + handle->changed = options & EBTC_INIT_WITHFLUSH ? EBTC_TRUE : EBTC_FALSE; + replace = &handle->replace; + + /* Open raw socket */ + + handle->fd = socket(AF_INET, SOCK_RAW, PF_INET); + + if (handle->fd == -1) { + + free(handle); + + self_private.error_no = ERR_RAWSOCKET; + + return NULL; + + } + + /* Get infomations */ + + memset(replace, 0, sizeof(ebt_replace_t)); + snprintf(replace->name, EBT_TABLE_MAXNAMELEN, "%s", tablename); + + optlen = sizeof(ebt_replace_t); + optname = options & EBTC_INIT_WITHFLUSH ? EBT_SO_GET_INIT_INFO : + EBT_SO_GET_INFO; + + if (getsockopt(handle->fd, IPPROTO_IP, optname, replace, &optlen)) { + + free(handle); + + self_private.error_no = ERR_GETINFO; + + return NULL; + + } + + /* Get entries */ + + if (replace->nentries) { + + size = replace->nentries * sizeof(ebt_counter_t); + replace->counters = (ebt_counter_t *)malloc(size); + + if (!replace->counters) { + + close(handle->fd); + free(handle); + + self_private.error_no = ERR_ALLOCATEMEM; + + return NULL; + + } + + } else { + + size = 0; + replace->counters = NULL; + + } + + handle->cache.num_counters = replace->num_counters = replace->nentries; + replace->entries = malloc(replace->entries_size); + + if (!replace->entries) { + + if (replace->counters) + free(replace->counters); + + close(handle->fd); + free(handle); + + self_private.error_no = ERR_ALLOCATEMEM; + + return NULL; + + } + + optlen += replace->entries_size; + optlen += replace->num_counters * sizeof(ebt_counter_t); + optname = options & EBTC_INIT_WITHFLUSH ? EBT_SO_GET_INIT_ENTRIES : + EBT_SO_GET_ENTRIES; + + if (getsockopt(handle->fd, IPPROTO_IP, optname, replace, &optlen)) { + + close(handle->fd); + + if (replace->counters) + free(replace->counters); + + free(replace->entries); + free(handle); + + self_private.error_no = ERR_GETENTRIES; + + return NULL; + + } + + /* Split one block from kernel into lists */ + + size = replace->entries_size; + entries = (ebt_entries_t *)replace->entries; + + for (; size > 0; size -= sizeof(ebt_entries_t)) { + + /* Allocate and fill a container for chain */ + + chain = (chain_list_t *)malloc(sizeof(chain_list_t)); + + if (!chain) { + + ebtc_free(&handle); + + self_private.error_no = ERR_ALLOCATEMEM; + + return NULL; + + } + + memset(chain, 0, sizeof(chain_list_t)); + memcpy(&chain->entries, entries, sizeof(ebt_entries_t)); + + chain->hookid = NF_BR_NUMHOOKS; + chain->id = handle->chains.last_id++; + + for (i = 0; i < NF_BR_NUMHOOKS; i++) { + + if (!strcmp(entries->name, builtinchains[i].name)) { + + chain->hookid = builtinchains[i].id; + break; + + } + + } + + if (handle->chains.last) { + + handle->chains.last->next = chain; + handle->chains.last = chain; + + } else + handle->chains.last = handle->chains.first = chain; + + handle->chains.count++; + + /* Put entries into rule list of current chain */ + + entry_count = entries->nentries; + counter = entries->counter_offset; + + entries++; + + if (entry_count) { + + entry = (ebt_entry_t *)entries; + counter = chain->entries.counter_offset; + + for (; entry_count > 0; entry_count--) { + + /* Allocate memory for rule */ + + rule_size = sizeof(rule_list_t) + entry->next_offset; + rule = (rule_list_t *)malloc(rule_size); + + if (!rule) { + + ebtc_free(&handle); + + self_private.error_no = ERR_ALLOCATEMEM; + + return NULL; + + } + + /* Initialize rule */ + + memset(rule, 0, sizeof(rule_list_t)); + + rule->counter.changed = EBTC_FALSE; + rule->counter.offset = counter; + + rule->entry = (ebt_entry_t *)(rule + 1); + memcpy(rule->entry, entry, entry->next_offset); + + chain->rules.size += entry->next_offset; + + memcpy(&rule->counter.counter, &replace->counters[counter++], + sizeof(ebt_counter_t)); + + if (chain->rules.last) { + + chain->rules.last->next = rule; + chain->rules.last = rule; + + } else + chain->rules.last = chain->rules.first = rule; + + chain->rules.count++; + + /* Jump to next entry */ + + size -= entry->next_offset; + entry = (ebt_entry_t *)((char *)entry + + entry->next_offset); + + } + + entries = (ebt_entries_t *)entry; + + } + + } + + /* Clean up */ + + if (replace->counters) { + + free(replace->counters); + replace->counters = NULL; + + } + + free(replace->entries); + replace->entries = NULL; + + handle->error_no = SUCCESS; + + return handle; + +} + + +static int precommit_standard_target (chain_list_t *chain, ebt_entry_t *entry) +{ + +/* ---- VAR ---- */ + + ebt_standard_target_t *target; + + + +/* ---- CODE ---- */ + + /* Check for standard target */ + + target = (ebt_standard_target_t *)EBTC_ADDOFFSET(entry, + entry->target_offset); + + if (strncmp(target->target.u.name, "standard", EBT_FUNCTION_MAXNAMELEN)) + return 0; + + for (; chain; chain = chain->next) { + + if (chain->id == target->verdict) { + + target->verdict = chain->offset; + + return 0; + + } + + } + + return 0; + +} + + +int ebtc_commit (ebtc_handle_t *handle) +{ + +/* ---- VAR ---- */ + + socklen_t optlen; + + int result; + + int fd; + + int i; + + unsigned int size; + + unsigned int size_entry; + + unsigned int size_entries = 0; + + unsigned int size_counters = 0; + + unsigned int counter_offset = 0; + + unsigned int count_entries = 0; + + chain_list_t *chain; + + rule_list_t *rule; + + ebt_replace_t *replace; + + ebt_entries_t *entries; + + ebt_entry_t *entry; + + ebt_counter_t *counters; + + ebt_counter_t *counters_back; + + + +/* ---- CODE ---- */ + + /* Check of all conditions */ + + if ((*handle)->changed == EBTC_FALSE) { + + ebtc_free(handle); + + self_private.error_no = SUCCESS; + + return 0; + + } + + /* Collect all size informations for entries */ + + for (chain = (*handle)->chains.first; chain; chain = chain->next) { + + chain->offset = size_entries; + + size_entries += sizeof(ebt_entries_t); + size_entries += chain->rules.size; + + size_counters += sizeof(ebt_counter_t) * chain->rules.count; + count_entries += chain->rules.count; + + } + + /* Allocate */ + + replace = (ebt_replace_t *)malloc(sizeof(ebt_replace_t)); + + if (!replace) { + + ebtc_free(handle); + + self_private.error_no = ERR_ALLOCATEMEM; + + return -1; + + } + + entries = (ebt_entries_t *)malloc(size_entries); + + if (!entries) { + + free(replace); + ebtc_free(handle); + + self_private.error_no = ERR_ALLOCATEMEM; + + return -1; + + } + + /* Pack all entries in a big block */ + + memcpy(replace, &(*handle)->replace, sizeof(ebt_replace_t)); + + replace->entries_size = size_entries; + replace->nentries = count_entries; + replace->entries = (char *)entries; + replace->counters = counters; + replace->num_counters = 0; + + for (chain = (*handle)->chains.first; chain; chain = chain->next) { + + /* Copy entries */ + + memcpy(entries, &chain->entries, sizeof(ebt_entries_t)); + + entries->distinguisher = 0; + entries->counter_offset = counter_offset; + entries->nentries = chain->rules.count; + + /* Is chain a hook chain? */ + + if (chain->hookid != NF_BR_NUMHOOKS) + replace->hook_entry[chain->hookid] = entries; + + /* Copy list of entries */ + + entries++; + entry = (ebt_entry_t *)entries; + + for (rule = chain->rules.first; rule; rule = rule->next) { + + size_entry = rule->entry->next_offset; + + result = precommit_standard_target((*handle)->chains.first, + rule->entry); + + if (result) { + + free(entries); + free(replace); + ebtc_free(handle); + + self_private.error_no = ERR_ENTRYTARGETINVALID; + + return -1; + + } + + memcpy(entry, rule->entry, size_entry); + entry = (ebt_entry_t *)((char *)entry + size_entry); + + } + + /* Setup for next entries */ + + counter_offset += chain->rules.count; + entries = (ebt_entries_t *)entry; + + } + + entries = (ebt_entries_t *)replace->entries; + + /* Create container for counter refresh */ + + if (size_counters > 0 && (*handle)->cache.num_counters > 0) { + + size = (*handle)->cache.num_counters * sizeof(ebt_counter_t); + replace->num_counters = (*handle)->cache.num_counters; + counters_back = replace->counters = (ebt_counter_t *)malloc(size); + + if (!counters_back) { + + free(entries); + free(replace); + ebtc_free(handle); + + self_private.error_no = ERR_ALLOCATEMEM; + + return -1; + + } + + } else { + + counters_back = replace->counters = NULL; + replace->num_counters = 0; + + } + + /* Submit entries to kernel */ + + fd = (*handle)->fd; + + optlen = sizeof(ebt_replace_t); + optlen += size_entries; + + if (setsockopt(fd, IPPROTO_IP, EBT_SO_SET_ENTRIES, replace, optlen)) { + + if (counters_back) + free(counters_back); + + free(entries); + free(replace); + ebtc_free(handle); + + self_private.error_no = ERR_SETENTRIES; + + return -1; + + } + + if (size_counters > 0) { + + /* Allocate memory for counters */ + + replace->counters = counters = (ebt_counter_t *)malloc(size_counters); + + if (!counters) { + + if (counters_back) + free(counters_back); + + free(replace); + ebtc_free(handle); + + self_private.error_no = ERR_ALLOCATEMEM; + + return -1; + + } + + /* Fill counters */ + + for (chain = (*handle)->chains.first; chain; chain = chain->next) { + + for (rule = chain->rules.first; rule; rule = rule->next) { + + if (rule->counter.changed == EBTC_FALSE) { + + memcpy(counters, &counters_back[rule->counter.offset], + sizeof(ebt_counter_t)); + + } else { + + memcpy(counters, &rule->counter.counter, + sizeof(ebt_counter_t)); + + } + + counters++; + + } + + } + + counters = replace->counters; + + if (counters_back) + free(counters_back); + + /* Submit counters to kernel */ + + replace->num_counters = count_entries; + replace->entries = NULL; + + optlen = sizeof(ebt_replace_t); + optlen += sizeof(ebt_counter_t) * count_entries; + + if (setsockopt(fd, IPPROTO_IP, EBT_SO_SET_COUNTERS, replace, optlen)) { + + free(counters); + free(entries); + free(replace); + ebtc_free(handle); + + self_private.error_no = ERR_SETCOUNTERS; + + return -1; + + } + + free(counters); + + } + + /* Clean up */ + + free(entries); + free(replace); + ebtc_free(handle); + + self_private.error_no = SUCCESS; + + return 0; + +} + + +void ebtc_free (ebtc_handle_t *handle) +{ + +/* ---- VAR ---- */ + + ebt_replace_t *replace = &(*handle)->replace; + + chain_list_t *chain = (*handle)->chains.first; + + chain_list_t *chain_next; + + rule_list_t *rule; + + rule_list_t *rule_next; + + + +/* ---- CODE ---- */ + + /* Free chain list with all rules */ + + for (; chain; chain = chain_next) { + + for (rule = chain->rules.first; rule; rule = rule_next) { + + rule_next = rule->next; + free(rule); + + } + + chain_next = chain->next; + free(chain); + + } + + /* Close gateway into the kernel */ + + close((*handle)->fd); + + /* Clean up*/ + + if (replace->counters) + free(replace->counters); + + if (replace->entries) + free(replace->entries); + + free(*handle); + + (*handle)->error_no = SUCCESS; + + return; + +} + + +const char *ebtc_strerror (const ebtc_handle_t *handle) +{ + +/* ---- VAR ---- */ + + int i; + + + +/* ---- CODE ---- */ + + if (handle) + i = (*handle)->error_no; + else + i = self_private.error_no; + + if (i > sizeof(error_msg) / sizeof(error_msg[0])) + return NULL; + + return error_msg[i].msg; + +} + + |