diff options
Diffstat (limited to 'include/libiptc')
| -rw-r--r-- | include/libiptc/ipt_kernel_headers.h | 16 | ||||
| -rw-r--r-- | include/libiptc/libip6tc.h | 162 | ||||
| -rw-r--r-- | include/libiptc/libiptc.h | 173 | ||||
| -rw-r--r-- | include/libiptc/libxtc.h | 34 | ||||
| -rw-r--r-- | include/libiptc/xtcshared.h | 21 |
5 files changed, 406 insertions, 0 deletions
diff --git a/include/libiptc/ipt_kernel_headers.h b/include/libiptc/ipt_kernel_headers.h new file mode 100644 index 0000000..3d2a2a3 --- /dev/null +++ b/include/libiptc/ipt_kernel_headers.h @@ -0,0 +1,16 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* This is the userspace/kernel interface for Generic IP Chains, + required for libc6. */ +#ifndef _FWCHAINS_KERNEL_HEADERS_H +#define _FWCHAINS_KERNEL_HEADERS_H + +#include <limits.h> + +#include <netinet/ip.h> +#include <netinet/in.h> +#include <netinet/ip_icmp.h> +#include <netinet/tcp.h> +#include <netinet/udp.h> +#include <net/if.h> +#include <sys/types.h> +#endif diff --git a/include/libiptc/libip6tc.h b/include/libiptc/libip6tc.h new file mode 100644 index 0000000..cd588de --- /dev/null +++ b/include/libiptc/libip6tc.h @@ -0,0 +1,162 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _LIBIP6TC_H +#define _LIBIP6TC_H +/* Library which manipulates firewall rules. Version 0.2. */ + +#include <linux/types.h> +#include <libiptc/ipt_kernel_headers.h> +#ifdef __cplusplus +# include <climits> +#else +# include <limits.h> /* INT_MAX in ip6_tables.h */ +#endif +#include <linux/netfilter_ipv6/ip6_tables.h> +#include <libiptc/xtcshared.h> + +#define ip6tc_handle xtc_handle +#define ip6t_chainlabel xt_chainlabel + +#define IP6TC_LABEL_ACCEPT "ACCEPT" +#define IP6TC_LABEL_DROP "DROP" +#define IP6TC_LABEL_QUEUE "QUEUE" +#define IP6TC_LABEL_RETURN "RETURN" + +/* Does this chain exist? */ +int ip6tc_is_chain(const char *chain, struct xtc_handle *const handle); + +/* Take a snapshot of the rules. Returns NULL on error. */ +struct xtc_handle *ip6tc_init(const char *tablename); + +/* Cleanup after ip6tc_init(). */ +void ip6tc_free(struct xtc_handle *h); + +/* Iterator functions to run through the chains. Returns NULL at end. */ +const char *ip6tc_first_chain(struct xtc_handle *handle); +const char *ip6tc_next_chain(struct xtc_handle *handle); + +/* Get first rule in the given chain: NULL for empty chain. */ +const struct ip6t_entry *ip6tc_first_rule(const char *chain, + struct xtc_handle *handle); + +/* Returns NULL when rules run out. */ +const struct ip6t_entry *ip6tc_next_rule(const struct ip6t_entry *prev, + struct xtc_handle *handle); + +/* Returns a pointer to the target name of this position. */ +const char *ip6tc_get_target(const struct ip6t_entry *e, + struct xtc_handle *handle); + +/* Is this a built-in chain? */ +int ip6tc_builtin(const char *chain, struct xtc_handle *const handle); + +/* Get the policy of a given built-in chain */ +const char *ip6tc_get_policy(const char *chain, + struct xt_counters *counters, + struct xtc_handle *handle); + +/* These functions return TRUE for OK or 0 and set errno. If errno == + 0, it means there was a version error (ie. upgrade libiptc). */ +/* Rule numbers start at 1 for the first rule. */ + +/* Insert the entry `fw' in chain `chain' into position `rulenum'. */ +int ip6tc_insert_entry(const xt_chainlabel chain, + const struct ip6t_entry *e, + unsigned int rulenum, + struct xtc_handle *handle); + +/* Atomically replace rule `rulenum' in `chain' with `fw'. */ +int ip6tc_replace_entry(const xt_chainlabel chain, + const struct ip6t_entry *e, + unsigned int rulenum, + struct xtc_handle *handle); + +/* Append entry `fw' to chain `chain'. Equivalent to insert with + rulenum = length of chain. */ +int ip6tc_append_entry(const xt_chainlabel chain, + const struct ip6t_entry *e, + struct xtc_handle *handle); + +/* Check whether a matching rule exists */ +int ip6tc_check_entry(const xt_chainlabel chain, + const struct ip6t_entry *origfw, + unsigned char *matchmask, + struct xtc_handle *handle); + +/* Delete the first rule in `chain' which matches `fw'. */ +int ip6tc_delete_entry(const xt_chainlabel chain, + const struct ip6t_entry *origfw, + unsigned char *matchmask, + struct xtc_handle *handle); + +/* Delete the rule in position `rulenum' in `chain'. */ +int ip6tc_delete_num_entry(const xt_chainlabel chain, + unsigned int rulenum, + struct xtc_handle *handle); + +/* Check the packet `fw' on chain `chain'. Returns the verdict, or + NULL and sets errno. */ +const char *ip6tc_check_packet(const xt_chainlabel chain, + struct ip6t_entry *, + struct xtc_handle *handle); + +/* Flushes the entries in the given chain (ie. empties chain). */ +int ip6tc_flush_entries(const xt_chainlabel chain, + struct xtc_handle *handle); + +/* Zeroes the counters in a chain. */ +int ip6tc_zero_entries(const xt_chainlabel chain, + struct xtc_handle *handle); + +/* Creates a new chain. */ +int ip6tc_create_chain(const xt_chainlabel chain, + struct xtc_handle *handle); + +/* Deletes a chain. */ +int ip6tc_delete_chain(const xt_chainlabel chain, + struct xtc_handle *handle); + +/* Renames a chain. */ +int ip6tc_rename_chain(const xt_chainlabel oldname, + const xt_chainlabel newname, + struct xtc_handle *handle); + +/* Sets the policy on a built-in chain. */ +int ip6tc_set_policy(const xt_chainlabel chain, + const xt_chainlabel policy, + struct xt_counters *counters, + struct xtc_handle *handle); + +/* Get the number of references to this chain */ +int ip6tc_get_references(unsigned int *ref, const xt_chainlabel chain, + struct xtc_handle *handle); + +/* read packet and byte counters for a specific rule */ +struct xt_counters *ip6tc_read_counter(const xt_chainlabel chain, + unsigned int rulenum, + struct xtc_handle *handle); + +/* zero packet and byte counters for a specific rule */ +int ip6tc_zero_counter(const xt_chainlabel chain, + unsigned int rulenum, + struct xtc_handle *handle); + +/* set packet and byte counters for a specific rule */ +int ip6tc_set_counter(const xt_chainlabel chain, + unsigned int rulenum, + struct xt_counters *counters, + struct xtc_handle *handle); + +/* Makes the actual changes. */ +int ip6tc_commit(struct xtc_handle *handle); + +/* Get raw socket. */ +int ip6tc_get_raw_socket(void); + +/* Translates errno numbers into more human-readable form than strerror. */ +const char *ip6tc_strerror(int err); + +extern void dump_entries6(struct xtc_handle *const); + +extern const struct xtc_ops ip6tc_ops; + +#endif /* _LIBIP6TC_H */ diff --git a/include/libiptc/libiptc.h b/include/libiptc/libiptc.h new file mode 100644 index 0000000..1bfe4e1 --- /dev/null +++ b/include/libiptc/libiptc.h @@ -0,0 +1,173 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _LIBIPTC_H +#define _LIBIPTC_H +/* Library which manipulates filtering rules. */ + +#include <linux/types.h> +#include <libiptc/ipt_kernel_headers.h> +#ifdef __cplusplus +# include <climits> +#else +# include <limits.h> /* INT_MAX in ip_tables.h */ +#endif +#include <linux/netfilter_ipv4/ip_tables.h> +#include <libiptc/xtcshared.h> + +#ifdef __cplusplus +extern "C" { +#endif + +#define iptc_handle xtc_handle +#define ipt_chainlabel xt_chainlabel + +#define IPTC_LABEL_ACCEPT "ACCEPT" +#define IPTC_LABEL_DROP "DROP" +#define IPTC_LABEL_QUEUE "QUEUE" +#define IPTC_LABEL_RETURN "RETURN" + +/* Does this chain exist? */ +int iptc_is_chain(const char *chain, struct xtc_handle *const handle); + +/* Take a snapshot of the rules. Returns NULL on error. */ +struct xtc_handle *iptc_init(const char *tablename); + +/* Cleanup after iptc_init(). */ +void iptc_free(struct xtc_handle *h); + +/* Iterator functions to run through the chains. Returns NULL at end. */ +const char *iptc_first_chain(struct xtc_handle *handle); +const char *iptc_next_chain(struct xtc_handle *handle); + +/* Get first rule in the given chain: NULL for empty chain. */ +const struct ipt_entry *iptc_first_rule(const char *chain, + struct xtc_handle *handle); + +/* Returns NULL when rules run out. */ +const struct ipt_entry *iptc_next_rule(const struct ipt_entry *prev, + struct xtc_handle *handle); + +/* Returns a pointer to the target name of this entry. */ +const char *iptc_get_target(const struct ipt_entry *e, + struct xtc_handle *handle); + +/* Is this a built-in chain? */ +int iptc_builtin(const char *chain, struct xtc_handle *const handle); + +/* Get the policy of a given built-in chain */ +const char *iptc_get_policy(const char *chain, + struct xt_counters *counter, + struct xtc_handle *handle); + +/* These functions return TRUE for OK or 0 and set errno. If errno == + 0, it means there was a version error (ie. upgrade libiptc). */ +/* Rule numbers start at 1 for the first rule. */ + +/* Insert the entry `e' in chain `chain' into position `rulenum'. */ +int iptc_insert_entry(const xt_chainlabel chain, + const struct ipt_entry *e, + unsigned int rulenum, + struct xtc_handle *handle); + +/* Atomically replace rule `rulenum' in `chain' with `e'. */ +int iptc_replace_entry(const xt_chainlabel chain, + const struct ipt_entry *e, + unsigned int rulenum, + struct xtc_handle *handle); + +/* Append entry `e' to chain `chain'. Equivalent to insert with + rulenum = length of chain. */ +int iptc_append_entry(const xt_chainlabel chain, + const struct ipt_entry *e, + struct xtc_handle *handle); + +/* Check whether a mathching rule exists */ +int iptc_check_entry(const xt_chainlabel chain, + const struct ipt_entry *origfw, + unsigned char *matchmask, + struct xtc_handle *handle); + +/* Delete the first rule in `chain' which matches `e', subject to + matchmask (array of length == origfw) */ +int iptc_delete_entry(const xt_chainlabel chain, + const struct ipt_entry *origfw, + unsigned char *matchmask, + struct xtc_handle *handle); + +/* Delete the rule in position `rulenum' in `chain'. */ +int iptc_delete_num_entry(const xt_chainlabel chain, + unsigned int rulenum, + struct xtc_handle *handle); + +/* Check the packet `e' on chain `chain'. Returns the verdict, or + NULL and sets errno. */ +const char *iptc_check_packet(const xt_chainlabel chain, + struct ipt_entry *entry, + struct xtc_handle *handle); + +/* Flushes the entries in the given chain (ie. empties chain). */ +int iptc_flush_entries(const xt_chainlabel chain, + struct xtc_handle *handle); + +/* Zeroes the counters in a chain. */ +int iptc_zero_entries(const xt_chainlabel chain, + struct xtc_handle *handle); + +/* Creates a new chain. */ +int iptc_create_chain(const xt_chainlabel chain, + struct xtc_handle *handle); + +/* Deletes a chain. */ +int iptc_delete_chain(const xt_chainlabel chain, + struct xtc_handle *handle); + +/* Renames a chain. */ +int iptc_rename_chain(const xt_chainlabel oldname, + const xt_chainlabel newname, + struct xtc_handle *handle); + +/* Sets the policy on a built-in chain. */ +int iptc_set_policy(const xt_chainlabel chain, + const xt_chainlabel policy, + struct xt_counters *counters, + struct xtc_handle *handle); + +/* Get the number of references to this chain */ +int iptc_get_references(unsigned int *ref, + const xt_chainlabel chain, + struct xtc_handle *handle); + +/* read packet and byte counters for a specific rule */ +struct xt_counters *iptc_read_counter(const xt_chainlabel chain, + unsigned int rulenum, + struct xtc_handle *handle); + +/* zero packet and byte counters for a specific rule */ +int iptc_zero_counter(const xt_chainlabel chain, + unsigned int rulenum, + struct xtc_handle *handle); + +/* set packet and byte counters for a specific rule */ +int iptc_set_counter(const xt_chainlabel chain, + unsigned int rulenum, + struct xt_counters *counters, + struct xtc_handle *handle); + +/* Makes the actual changes. */ +int iptc_commit(struct xtc_handle *handle); + +/* Get raw socket. */ +int iptc_get_raw_socket(void); + +/* Translates errno numbers into more human-readable form than strerror. */ +const char *iptc_strerror(int err); + +extern void dump_entries(struct xtc_handle *const); + +extern const struct xtc_ops iptc_ops; + +#ifdef __cplusplus +} +#endif + + +#endif /* _LIBIPTC_H */ diff --git a/include/libiptc/libxtc.h b/include/libiptc/libxtc.h new file mode 100644 index 0000000..1e9596a --- /dev/null +++ b/include/libiptc/libxtc.h @@ -0,0 +1,34 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _LIBXTC_H +#define _LIBXTC_H +/* Library which manipulates filtering rules. */ + +#include <libiptc/ipt_kernel_headers.h> +#include <linux/netfilter/x_tables.h> + +#ifdef __cplusplus +extern "C" { +#endif + +#ifndef XT_MIN_ALIGN +/* xt_entry has pointers and u_int64_t's in it, so if you align to + it, you'll also align to any crazy matches and targets someone + might write */ +#define XT_MIN_ALIGN (__alignof__(struct xt_entry)) +#endif + +#ifndef XT_ALIGN +#define XT_ALIGN(s) (((s) + ((XT_MIN_ALIGN)-1)) & ~((XT_MIN_ALIGN)-1)) +#endif + +#define XTC_LABEL_ACCEPT "ACCEPT" +#define XTC_LABEL_DROP "DROP" +#define XTC_LABEL_QUEUE "QUEUE" +#define XTC_LABEL_RETURN "RETURN" + + +#ifdef __cplusplus +} +#endif + +#endif /* _LIBXTC_H */ diff --git a/include/libiptc/xtcshared.h b/include/libiptc/xtcshared.h new file mode 100644 index 0000000..278a58f --- /dev/null +++ b/include/libiptc/xtcshared.h @@ -0,0 +1,21 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _LIBXTC_SHARED_H +#define _LIBXTC_SHARED_H 1 + +typedef char xt_chainlabel[32]; +struct xtc_handle; +struct xt_counters; + +struct xtc_ops { + int (*commit)(struct xtc_handle *); + void (*free)(struct xtc_handle *); + int (*builtin)(const char *, struct xtc_handle *const); + int (*is_chain)(const char *, struct xtc_handle *const); + int (*flush_entries)(const xt_chainlabel, struct xtc_handle *); + int (*create_chain)(const xt_chainlabel, struct xtc_handle *); + int (*set_policy)(const xt_chainlabel, const xt_chainlabel, + struct xt_counters *, struct xtc_handle *); + const char *(*strerror)(int); +}; + +#endif /* _LIBXTC_SHARED_H */ |