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提交 080774a2 编写于 作者: H Harald Welte 提交者： David S. Miller
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[NETFILTER]: Add ctnetlink subsystem 

Add ctnetlink subsystem for userspace-access to ip_conntrack table.
This allows reading and updating of existing entries, as well as
creating new ones (and new expect's) via nfnetlink.

Please note the 'strange' byte order: nfattr (tag+length) are in host
byte order, while the payload is always guaranteed to be in network
byte order.  This allows a simple userspace process to encapsulate netlink
messages into arch-independent udp packets by just processing/swapping the
headers and not knowing anything about the actual payload.
Signed-off-by: NHarald Welte <laforge@netfilter.org>
Signed-off-by: NPatrick McHardy <kaber@trash.net>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
上级 6f1cf165
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include/linux/netfilter/nfnetlink.h
浏览文件 @ 080774a2
......@@ -56,7 +56,7 @@ struct nfgenmsg {
u_int16_t res_id; /* resource id */
} __attribute__ ((packed));
#define NFNETLINK_V1 1
#define NFNETLINK_V0 0
#define NFM_NFA(n) ((struct nfattr *)(((char *)(n)) \
+ NLMSG_ALIGN(sizeof(struct nfgenmsg))))
......@@ -81,6 +81,7 @@ enum nfnl_subsys_id {
#ifdef __KERNEL__
#include <linux/netlink.h>
#include <linux/capability.h>
struct nfnl_callback
......
include/linux/netfilter/nfnetlink_conntrack.h 0 → 100644
浏览文件 @ 080774a2
#ifndef _IPCONNTRACK_NETLINK_H
#define _IPCONNTRACK_NETLINK_H
#include <linux/netfilter/nfnetlink.h>
enum cntl_msg_types {
IPCTNL_MSG_CT_NEW,
IPCTNL_MSG_CT_GET,
IPCTNL_MSG_CT_DELETE,
IPCTNL_MSG_CT_GET_CTRZERO,
IPCTNL_MSG_MAX
};
enum ctnl_exp_msg_types {
IPCTNL_MSG_EXP_NEW,
IPCTNL_MSG_EXP_GET,
IPCTNL_MSG_EXP_DELETE,
IPCTNL_MSG_EXP_MAX
};
enum ctattr_type {
CTA_UNSPEC,
CTA_TUPLE_ORIG,
CTA_TUPLE_REPLY,
CTA_STATUS,
CTA_PROTOINFO,
CTA_HELP,
CTA_NAT,
CTA_TIMEOUT,
CTA_MARK,
CTA_COUNTERS_ORIG,
CTA_COUNTERS_REPLY,
CTA_USE,
CTA_EXPECT,
CTA_ID,
__CTA_MAX
};
#define CTA_MAX (__CTA_MAX - 1)
enum ctattr_tuple {
CTA_TUPLE_UNSPEC,
CTA_TUPLE_IP,
CTA_TUPLE_PROTO,
__CTA_TUPLE_MAX
};
#define CTA_TUPLE_MAX (__CTA_TUPLE_MAX - 1)
enum ctattr_ip {
CTA_IP_UNSPEC,
CTA_IP_V4_SRC,
CTA_IP_V4_DST,
CTA_IP_V6_SRC,
CTA_IP_V6_DST,
__CTA_IP_MAX
};
#define CTA_IP_MAX (__CTA_IP_MAX - 1)
enum ctattr_l4proto {
CTA_PROTO_UNSPEC,
CTA_PROTO_NUM,
CTA_PROTO_SRC_PORT,
CTA_PROTO_DST_PORT,
CTA_PROTO_ICMP_ID,
CTA_PROTO_ICMP_TYPE,
CTA_PROTO_ICMP_CODE,
__CTA_PROTO_MAX
};
#define CTA_PROTO_MAX (__CTA_PROTO_MAX - 1)
enum ctattr_protoinfo {
CTA_PROTOINFO_UNSPEC,
CTA_PROTOINFO_TCP_STATE,
__CTA_PROTOINFO_MAX
};
#define CTA_PROTOINFO_MAX (__CTA_PROTOINFO_MAX - 1)
enum ctattr_counters {
CTA_COUNTERS_UNSPEC,
CTA_COUNTERS_PACKETS,
CTA_COUNTERS_BYTES,
__CTA_COUNTERS_MAX
};
#define CTA_COUNTERS_MAX (__CTA_COUNTERS_MAX - 1)
enum ctattr_nat {
CTA_NAT_UNSPEC,
CTA_NAT_MINIP,
CTA_NAT_MAXIP,
CTA_NAT_PROTO,
__CTA_NAT_MAX
};
#define CTA_NAT_MAX (__CTA_NAT_MAX - 1)
enum ctattr_protonat {
CTA_PROTONAT_UNSPEC,
CTA_PROTONAT_PORT_MIN,
CTA_PROTONAT_PORT_MAX,
__CTA_PROTONAT_MAX
};
#define CTA_PROTONAT_MAX (__CTA_PROTONAT_MAX - 1)
enum ctattr_expect {
CTA_EXPECT_UNSPEC,
CTA_EXPECT_TUPLE,
CTA_EXPECT_MASK,
CTA_EXPECT_TIMEOUT,
CTA_EXPECT_ID,
__CTA_EXPECT_MAX
};
#define CTA_EXPECT_MAX (__CTA_EXPECT_MAX - 1)
enum ctattr_help {
CTA_HELP_UNSPEC,
CTA_HELP_NAME,
__CTA_HELP_MAX
};
#define CTA_HELP_MAX (__CTA_HELP_MAX - 1)
#define CTA_HELP_MAXNAMESIZE 32
#endif /* _IPCONNTRACK_NETLINK_H */
include/linux/netfilter_ipv4/ip_conntrack.h
浏览文件 @ 080774a2
......@@ -209,6 +209,9 @@ struct ip_conntrack
/* Current number of expected connections */
unsigned int expecting;
/* Unique ID that identifies this conntrack*/
unsigned int id;
/* Helper, if any. */
struct ip_conntrack_helper *helper;
......@@ -257,6 +260,9 @@ struct ip_conntrack_expect
/* Usage count. */
atomic_t use;
/* Unique ID */
unsigned int id;
#ifdef CONFIG_IP_NF_NAT_NEEDED
/* This is the original per-proto part, used to map the
* expected connection the way the recipient expects. */
......@@ -296,7 +302,12 @@ ip_conntrack_get(const struct sk_buff *skb, enum ip_conntrack_info *ctinfo)
}
/* decrement reference count on a conntrack */
extern void ip_conntrack_put(struct ip_conntrack *ct);
static inline void
ip_conntrack_put(struct ip_conntrack *ct)
{
IP_NF_ASSERT(ct);
nf_conntrack_put(&ct->ct_general);
}
/* call to create an explicit dependency on ip_conntrack. */
extern void need_ip_conntrack(void);
......@@ -331,6 +342,39 @@ extern void
ip_ct_iterate_cleanup(int (*iter)(struct ip_conntrack *i, void *data),
void *data);
extern struct ip_conntrack_helper *
__ip_conntrack_helper_find_byname(const char *);
extern struct ip_conntrack_helper *
ip_conntrack_helper_find_get(const struct ip_conntrack_tuple *tuple);
extern void ip_conntrack_helper_put(struct ip_conntrack_helper *helper);
extern struct ip_conntrack_protocol *
__ip_conntrack_proto_find(u_int8_t protocol);
extern struct ip_conntrack_protocol *
ip_conntrack_proto_find_get(u_int8_t protocol);
extern void ip_conntrack_proto_put(struct ip_conntrack_protocol *proto);
extern void ip_ct_remove_expectations(struct ip_conntrack *ct);
extern struct ip_conntrack *ip_conntrack_alloc(struct ip_conntrack_tuple *,
struct ip_conntrack_tuple *);
extern void ip_conntrack_free(struct ip_conntrack *ct);
extern void ip_conntrack_hash_insert(struct ip_conntrack *ct);
extern struct ip_conntrack_expect *
__ip_conntrack_expect_find(const struct ip_conntrack_tuple *tuple);
extern struct ip_conntrack_expect *
ip_conntrack_expect_find_get(const struct ip_conntrack_tuple *tuple);
extern struct ip_conntrack_tuple_hash *
__ip_conntrack_find(const struct ip_conntrack_tuple *tuple,
const struct ip_conntrack *ignored_conntrack);
extern void ip_conntrack_flush(void);
/* It's confirmed if it is, or has been in the hash table. */
static inline int is_confirmed(struct ip_conntrack *ct)
{
......
include/linux/netfilter_ipv4/ip_conntrack_core.h
浏览文件 @ 080774a2
......@@ -2,6 +2,9 @@
#define _IP_CONNTRACK_CORE_H
#include <linux/netfilter.h>
#define MAX_IP_CT_PROTO 256
extern struct ip_conntrack_protocol *ip_ct_protos[MAX_IP_CT_PROTO];
/* This header is used to share core functionality between the
standalone connection tracking module, and the compatibility layer's use
of connection tracking. */
......@@ -53,6 +56,8 @@ struct ip_conntrack_ecache;
extern void __ip_ct_deliver_cached_events(struct ip_conntrack_ecache *ec);
#endif
extern void __ip_ct_expect_unlink_destroy(struct ip_conntrack_expect *exp);
extern struct list_head *ip_conntrack_hash;
extern struct list_head ip_conntrack_expect_list;
extern rwlock_t ip_conntrack_lock;
......
include/linux/netfilter_ipv4/ip_conntrack_helper.h
浏览文件 @ 080774a2
......@@ -24,6 +24,8 @@ struct ip_conntrack_helper
int (*help)(struct sk_buff **pskb,
struct ip_conntrack *ct,
enum ip_conntrack_info conntrackinfo);
int (*to_nfattr)(struct sk_buff *skb, const struct ip_conntrack *ct);
};
extern int ip_conntrack_helper_register(struct ip_conntrack_helper *);
......
include/linux/netfilter_ipv4/ip_conntrack_protocol.h
浏览文件 @ 080774a2
......@@ -2,6 +2,7 @@
#ifndef _IP_CONNTRACK_PROTOCOL_H
#define _IP_CONNTRACK_PROTOCOL_H
#include <linux/netfilter_ipv4/ip_conntrack.h>
#include <linux/netfilter/nfnetlink_conntrack.h>
struct seq_file;
......@@ -47,22 +48,22 @@ struct ip_conntrack_protocol
int (*error)(struct sk_buff *skb, enum ip_conntrack_info *ctinfo,
unsigned int hooknum);
/* convert protoinfo to nfnetink attributes */
int (*to_nfattr)(struct sk_buff *skb, struct nfattr *nfa,
const struct ip_conntrack *ct);
int (*tuple_to_nfattr)(struct sk_buff *skb,
const struct ip_conntrack_tuple *t);
int (*nfattr_to_tuple)(struct nfattr *tb[],
struct ip_conntrack_tuple *t);
/* Module (if any) which this is connected to. */
struct module *me;
};
#define MAX_IP_CT_PROTO 256
extern struct ip_conntrack_protocol *ip_ct_protos[MAX_IP_CT_PROTO];
/* Protocol registration. */
extern int ip_conntrack_protocol_register(struct ip_conntrack_protocol *proto);
extern void ip_conntrack_protocol_unregister(struct ip_conntrack_protocol *proto);
static inline struct ip_conntrack_protocol *ip_ct_find_proto(u_int8_t protocol)
{
return ip_ct_protos[protocol];
}
/* Existing built-in protocols */
extern struct ip_conntrack_protocol ip_conntrack_protocol_tcp;
extern struct ip_conntrack_protocol ip_conntrack_protocol_udp;
......@@ -73,6 +74,11 @@ extern int ip_conntrack_protocol_tcp_init(void);
/* Log invalid packets */
extern unsigned int ip_ct_log_invalid;
extern int ip_ct_port_tuple_to_nfattr(struct sk_buff *,
const struct ip_conntrack_tuple *);
extern int ip_ct_port_nfattr_to_tuple(struct nfattr *tb[],
struct ip_conntrack_tuple *);
#ifdef CONFIG_SYSCTL
#ifdef DEBUG_INVALID_PACKETS
#define LOG_INVALID(proto) \
......
include/linux/netfilter_ipv4/ip_nat_protocol.h
浏览文件 @ 080774a2
......@@ -4,6 +4,9 @@
#include <linux/init.h>
#include <linux/list.h>
#include <linux/netfilter_ipv4/ip_nat.h>
#include <linux/netfilter/nfnetlink_conntrack.h>
struct iphdr;
struct ip_nat_range;
......@@ -15,6 +18,8 @@ struct ip_nat_protocol
/* Protocol number. */
unsigned int protonum;
struct module *me;
/* Translate a packet to the target according to manip type.
Return true if succeeded. */
int (*manip_pkt)(struct sk_buff **pskb,
......@@ -43,19 +48,20 @@ struct ip_nat_protocol
unsigned int (*print_range)(char *buffer,
const struct ip_nat_range *range);
};
#define MAX_IP_NAT_PROTO 256
extern struct ip_nat_protocol *ip_nat_protos[MAX_IP_NAT_PROTO];
int (*range_to_nfattr)(struct sk_buff *skb,
const struct ip_nat_range *range);
int (*nfattr_to_range)(struct nfattr *tb[],
struct ip_nat_range *range);
};
/* Protocol registration. */
extern int ip_nat_protocol_register(struct ip_nat_protocol *proto);
extern void ip_nat_protocol_unregister(struct ip_nat_protocol *proto);
static inline struct ip_nat_protocol *ip_nat_find_proto(u_int8_t protocol)
{
return ip_nat_protos[protocol];
}
extern struct ip_nat_protocol *ip_nat_proto_find_get(u_int8_t protocol);
extern void ip_nat_proto_put(struct ip_nat_protocol *proto);
/* Built-in protocols. */
extern struct ip_nat_protocol ip_nat_protocol_tcp;
......@@ -67,4 +73,9 @@ extern int init_protocols(void) __init;
extern void cleanup_protocols(void);
extern struct ip_nat_protocol *find_nat_proto(u_int16_t protonum);
extern int ip_nat_port_range_to_nfattr(struct sk_buff *skb,
const struct ip_nat_range *range);
extern int ip_nat_port_nfattr_to_range(struct nfattr *tb[],
struct ip_nat_range *range);
#endif /*_IP_NAT_PROTO_H*/
net/ipv4/netfilter/Kconfig
浏览文件 @ 080774a2
......@@ -702,5 +702,12 @@ config IP_NF_ARP_MANGLE
Allows altering the ARP packet payload: source and destination
hardware and network addresses.
config IP_NF_CONNTRACK_NETLINK
tristate 'Connection tracking netlink interface'
depends on IP_NF_CONNTRACK && NETFILTER_NETLINK
help
This option enables support for a netlink-based userspace interface
endmenu
net/ipv4/netfilter/Makefile
浏览文件 @ 080774a2
......@@ -9,6 +9,10 @@ iptable_nat-objs := ip_nat_standalone.o ip_nat_rule.o ip_nat_core.o ip_nat_helpe
# connection tracking
obj-$(CONFIG_IP_NF_CONNTRACK) += ip_conntrack.o
# conntrack netlink interface
obj-$(CONFIG_IP_NF_CONNTRACK_NETLINK) += ip_conntrack_netlink.o
# SCTP protocol connection tracking
obj-$(CONFIG_IP_NF_CT_PROTO_SCTP) += ip_conntrack_proto_sctp.o
......
net/ipv4/netfilter/ip_conntrack_core.c
浏览文件 @ 080774a2
......@@ -50,7 +50,7 @@
#include <linux/netfilter_ipv4/ip_conntrack_core.h>
#include <linux/netfilter_ipv4/listhelp.h>
#define IP_CONNTRACK_VERSION "2.2"
#define IP_CONNTRACK_VERSION "2.3"
#if 0
#define DEBUGP printk
......@@ -77,6 +77,8 @@ unsigned int ip_ct_log_invalid;
static LIST_HEAD(unconfirmed);
static int ip_conntrack_vmalloc;
static unsigned int ip_conntrack_next_id = 1;
static unsigned int ip_conntrack_expect_next_id = 1;
#ifdef CONFIG_IP_NF_CONNTRACK_EVENTS
struct notifier_block *ip_conntrack_chain;
struct notifier_block *ip_conntrack_expect_chain;
......@@ -154,13 +156,6 @@ void ip_conntrack_event_cache_init(const struct sk_buff *skb)
DEFINE_PER_CPU(struct ip_conntrack_stat, ip_conntrack_stat);
void
ip_conntrack_put(struct ip_conntrack *ct)
{
IP_NF_ASSERT(ct);
nf_conntrack_put(&ct->ct_general);
}
static int ip_conntrack_hash_rnd_initted;
static unsigned int ip_conntrack_hash_rnd;
......@@ -222,6 +217,12 @@ static void unlink_expect(struct ip_conntrack_expect *exp)
exp->master->expecting--;
}
void __ip_ct_expect_unlink_destroy(struct ip_conntrack_expect *exp)
{
unlink_expect(exp);
ip_conntrack_expect_put(exp);
}
static void expectation_timed_out(unsigned long ul_expect)
{
struct ip_conntrack_expect *exp = (void *)ul_expect;
......@@ -232,6 +233,33 @@ static void expectation_timed_out(unsigned long ul_expect)
ip_conntrack_expect_put(exp);
}
struct ip_conntrack_expect *
__ip_conntrack_expect_find(const struct ip_conntrack_tuple *tuple)
{
struct ip_conntrack_expect *i;
list_for_each_entry(i, &ip_conntrack_expect_list, list) {
if (ip_ct_tuple_mask_cmp(tuple, &i->tuple, &i->mask)) {
atomic_inc(&i->use);
return i;
}
}
return NULL;
}
/* Just find a expectation corresponding to a tuple. */
struct ip_conntrack_expect *
ip_conntrack_expect_find_get(const struct ip_conntrack_tuple *tuple)
{
struct ip_conntrack_expect *i;
read_lock_bh(&ip_conntrack_lock);
i = __ip_conntrack_expect_find(tuple);
read_unlock_bh(&ip_conntrack_lock);
return i;
}
/* If an expectation for this connection is found, it gets delete from
* global list then returned. */
static struct ip_conntrack_expect *
......@@ -256,7 +284,7 @@ find_expectation(const struct ip_conntrack_tuple *tuple)
}
/* delete all expectations for this conntrack */
static void remove_expectations(struct ip_conntrack *ct)
void ip_ct_remove_expectations(struct ip_conntrack *ct)
{
struct ip_conntrack_expect *i, *tmp;
......@@ -286,7 +314,7 @@ clean_from_lists(struct ip_conntrack *ct)
LIST_DELETE(&ip_conntrack_hash[hr], &ct->tuplehash[IP_CT_DIR_REPLY]);
/* Destroy all pending expectations */
remove_expectations(ct);
ip_ct_remove_expectations(ct);
}
static void
......@@ -304,7 +332,7 @@ destroy_conntrack(struct nf_conntrack *nfct)
/* To make sure we don't get any weird locking issues here:
* destroy_conntrack() MUST NOT be called with a write lock
* to ip_conntrack_lock!!! -HW */
proto = ip_ct_find_proto(ct->tuplehash[IP_CT_DIR_REPLY].tuple.dst.protonum);
proto = __ip_conntrack_proto_find(ct->tuplehash[IP_CT_DIR_REPLY].tuple.dst.protonum);
if (proto && proto->destroy)
proto->destroy(ct);
......@@ -316,7 +344,7 @@ destroy_conntrack(struct nf_conntrack *nfct)
* except TFTP can create an expectation on the first packet,
* before connection is in the list, so we need to clean here,
* too. */
remove_expectations(ct);
ip_ct_remove_expectations(ct);
/* We overload first tuple to link into unconfirmed list. */
if (!is_confirmed(ct)) {
......@@ -331,8 +359,7 @@ destroy_conntrack(struct nf_conntrack *nfct)
ip_conntrack_put(ct->master);
DEBUGP("destroy_conntrack: returning ct=%p to slab\n", ct);
kmem_cache_free(ip_conntrack_cachep, ct);
atomic_dec(&ip_conntrack_count);
ip_conntrack_free(ct);
}
static void death_by_timeout(unsigned long ul_conntrack)
......@@ -359,7 +386,7 @@ conntrack_tuple_cmp(const struct ip_conntrack_tuple_hash *i,
&& ip_ct_tuple_equal(tuple, &i->tuple);
}
static struct ip_conntrack_tuple_hash *
struct ip_conntrack_tuple_hash *
__ip_conntrack_find(const struct ip_conntrack_tuple *tuple,
const struct ip_conntrack *ignored_conntrack)
{
......@@ -394,6 +421,29 @@ ip_conntrack_find_get(const struct ip_conntrack_tuple *tuple,
return h;
}
static void __ip_conntrack_hash_insert(struct ip_conntrack *ct,
unsigned int hash,
unsigned int repl_hash)
{
ct->id = ++ip_conntrack_next_id;
list_prepend(&ip_conntrack_hash[hash],
&ct->tuplehash[IP_CT_DIR_ORIGINAL].list);
list_prepend(&ip_conntrack_hash[repl_hash],
&ct->tuplehash[IP_CT_DIR_REPLY].list);
}
void ip_conntrack_hash_insert(struct ip_conntrack *ct)
{
unsigned int hash, repl_hash;
hash = hash_conntrack(&ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple);
repl_hash = hash_conntrack(&ct->tuplehash[IP_CT_DIR_REPLY].tuple);
write_lock_bh(&ip_conntrack_lock);
__ip_conntrack_hash_insert(ct, hash, repl_hash);
write_unlock_bh(&ip_conntrack_lock);
}
/* Confirm a connection given skb; places it in hash table */
int
__ip_conntrack_confirm(struct sk_buff **pskb)
......@@ -440,10 +490,7 @@ __ip_conntrack_confirm(struct sk_buff **pskb)
/* Remove from unconfirmed list */
list_del(&ct->tuplehash[IP_CT_DIR_ORIGINAL].list);
list_prepend(&ip_conntrack_hash[hash],
&ct->tuplehash[IP_CT_DIR_ORIGINAL]);
list_prepend(&ip_conntrack_hash[repl_hash],
&ct->tuplehash[IP_CT_DIR_REPLY]);
__ip_conntrack_hash_insert(ct, hash, repl_hash);
/* Timer relative to confirmation time, not original
setting time, otherwise we'd get timer wrap in
weird delay cases. */
......@@ -527,34 +574,84 @@ static inline int helper_cmp(const struct ip_conntrack_helper *i,
return ip_ct_tuple_mask_cmp(rtuple, &i->tuple, &i->mask);
}
static struct ip_conntrack_helper *ip_ct_find_helper(const struct ip_conntrack_tuple *tuple)
static struct ip_conntrack_helper *
__ip_conntrack_helper_find( const struct ip_conntrack_tuple *tuple)
{
return LIST_FIND(&helpers, helper_cmp,
struct ip_conntrack_helper *,
tuple);
}
/* Allocate a new conntrack: we return -ENOMEM if classification
failed due to stress. Otherwise it really is unclassifiable. */
static struct ip_conntrack_tuple_hash *
init_conntrack(const struct ip_conntrack_tuple *tuple,
struct ip_conntrack_protocol *protocol,
struct sk_buff *skb)
struct ip_conntrack_helper *
ip_conntrack_helper_find_get( const struct ip_conntrack_tuple *tuple)
{
struct ip_conntrack_helper *helper;
/* need ip_conntrack_lock to assure that helper exists until
* try_module_get() is called */
read_lock_bh(&ip_conntrack_lock);
helper = __ip_conntrack_helper_find(tuple);
if (helper) {
/* need to increase module usage count to assure helper will
* not go away while the caller is e.g. busy putting a
* conntrack in the hash that uses the helper */
if (!try_module_get(helper->me))
helper = NULL;
}
read_unlock_bh(&ip_conntrack_lock);
return helper;
}
void ip_conntrack_helper_put(struct ip_conntrack_helper *helper)
{
module_put(helper->me);
}
struct ip_conntrack_protocol *
__ip_conntrack_proto_find(u_int8_t protocol)
{
return ip_ct_protos[protocol];
}
/* this is guaranteed to always return a valid protocol helper, since
* it falls back to generic_protocol */
struct ip_conntrack_protocol *
ip_conntrack_proto_find_get(u_int8_t protocol)
{
struct ip_conntrack_protocol *p;
preempt_disable();
p = __ip_conntrack_proto_find(protocol);
if (p) {
if (!try_module_get(p->me))
p = &ip_conntrack_generic_protocol;
}
preempt_enable();
return p;
}
void ip_conntrack_proto_put(struct ip_conntrack_protocol *p)
{
module_put(p->me);
}
struct ip_conntrack *ip_conntrack_alloc(struct ip_conntrack_tuple *orig,
struct ip_conntrack_tuple *repl)
{
struct ip_conntrack *conntrack;
struct ip_conntrack_tuple repl_tuple;
size_t hash;
struct ip_conntrack_expect *exp;
if (!ip_conntrack_hash_rnd_initted) {
get_random_bytes(&ip_conntrack_hash_rnd, 4);
ip_conntrack_hash_rnd_initted = 1;
}
hash = hash_conntrack(tuple);
if (ip_conntrack_max
&& atomic_read(&ip_conntrack_count) >= ip_conntrack_max) {
unsigned int hash = hash_conntrack(orig);
/* Try dropping from this hash chain. */
if (!early_drop(&ip_conntrack_hash[hash])) {
if (net_ratelimit())
......@@ -565,31 +662,58 @@ init_conntrack(const struct ip_conntrack_tuple *tuple,
}
}
if (!ip_ct_invert_tuple(&repl_tuple, tuple, protocol)) {
DEBUGP("Can't invert tuple.\n");
return NULL;
}
conntrack = kmem_cache_alloc(ip_conntrack_cachep, GFP_ATOMIC);
if (!conntrack) {
DEBUGP("Can't allocate conntrack.\n");
return ERR_PTR(-ENOMEM);
return NULL;
}
memset(conntrack, 0, sizeof(*conntrack));
atomic_set(&conntrack->ct_general.use, 1);
conntrack->ct_general.destroy = destroy_conntrack;
conntrack->tuplehash[IP_CT_DIR_ORIGINAL].tuple = *tuple;
conntrack->tuplehash[IP_CT_DIR_REPLY].tuple = repl_tuple;
if (!protocol->new(conntrack, skb)) {
kmem_cache_free(ip_conntrack_cachep, conntrack);
return NULL;
}
conntrack->tuplehash[IP_CT_DIR_ORIGINAL].tuple = *orig;
conntrack->tuplehash[IP_CT_DIR_REPLY].tuple = *repl;
/* Don't set timer yet: wait for confirmation */
init_timer(&conntrack->timeout);
conntrack->timeout.data = (unsigned long)conntrack;
conntrack->timeout.function = death_by_timeout;
atomic_inc(&ip_conntrack_count);
return conntrack;
}
void
ip_conntrack_free(struct ip_conntrack *conntrack)
{
atomic_dec(&ip_conntrack_count);
kmem_cache_free(ip_conntrack_cachep, conntrack);
}
/* Allocate a new conntrack: we return -ENOMEM if classification
* failed due to stress. Otherwise it really is unclassifiable */
static struct ip_conntrack_tuple_hash *
init_conntrack(struct ip_conntrack_tuple *tuple,
struct ip_conntrack_protocol *protocol,
struct sk_buff *skb)
{
struct ip_conntrack *conntrack;
struct ip_conntrack_tuple repl_tuple;
struct ip_conntrack_expect *exp;
if (!ip_ct_invert_tuple(&repl_tuple, tuple, protocol)) {
DEBUGP("Can't invert tuple.\n");
return NULL;
}
if (!(conntrack = ip_conntrack_alloc(tuple, &repl_tuple)))
return NULL;
if (!protocol->new(conntrack, skb)) {
ip_conntrack_free(conntrack);
return NULL;
}
write_lock_bh(&ip_conntrack_lock);
exp = find_expectation(tuple);
......@@ -610,7 +734,7 @@ init_conntrack(const struct ip_conntrack_tuple *tuple,
nf_conntrack_get(&conntrack->master->ct_general);
CONNTRACK_STAT_INC(expect_new);
} else {
conntrack->helper = ip_ct_find_helper(&repl_tuple);
conntrack->helper = __ip_conntrack_helper_find(&repl_tuple);
CONNTRACK_STAT_INC(new);
}
......@@ -618,7 +742,6 @@ init_conntrack(const struct ip_conntrack_tuple *tuple,
/* Overload tuple linked list to put us in unconfirmed list. */
list_add(&conntrack->tuplehash[IP_CT_DIR_ORIGINAL].list, &unconfirmed);
atomic_inc(&ip_conntrack_count);
write_unlock_bh(&ip_conntrack_lock);
if (exp) {
......@@ -729,7 +852,7 @@ unsigned int ip_conntrack_in(unsigned int hooknum,
}
#endif
proto = ip_ct_find_proto((*pskb)->nh.iph->protocol);
proto = __ip_conntrack_proto_find((*pskb)->nh.iph->protocol);
/* It may be an special packet, error, unclean...
* inverse of the return code tells to the netfilter
......@@ -777,7 +900,7 @@ int invert_tuplepr(struct ip_conntrack_tuple *inverse,
const struct ip_conntrack_tuple *orig)
{
return ip_ct_invert_tuple(inverse, orig,
ip_ct_find_proto(orig->dst.protonum));
__ip_conntrack_proto_find(orig->dst.protonum));
}
/* Would two expected things clash? */
......@@ -857,6 +980,8 @@ static void ip_conntrack_expect_insert(struct ip_conntrack_expect *exp)
exp->timeout.expires = jiffies + exp->master->helper->timeout * HZ;
add_timer(&exp->timeout);
exp->id = ++ip_conntrack_expect_next_id;
atomic_inc(&exp->use);
CONNTRACK_STAT_INC(expect_create);
}
......@@ -936,7 +1061,7 @@ void ip_conntrack_alter_reply(struct ip_conntrack *conntrack,
conntrack->tuplehash[IP_CT_DIR_REPLY].tuple = *newreply;
if (!conntrack->master && conntrack->expecting == 0)
conntrack->helper = ip_ct_find_helper(newreply);
conntrack->helper = __ip_conntrack_helper_find(newreply);
write_unlock_bh(&ip_conntrack_lock);
}
......@@ -950,6 +1075,19 @@ int ip_conntrack_helper_register(struct ip_conntrack_helper *me)
return 0;
}
struct ip_conntrack_helper *
__ip_conntrack_helper_find_byname(const char *name)
{
struct ip_conntrack_helper *h;
list_for_each_entry(h, &helpers, list) {
if (!strcmp(h->name, name))
return h;
}
return NULL;
}
static inline int unhelp(struct ip_conntrack_tuple_hash *i,
const struct ip_conntrack_helper *me)
{
......@@ -1025,6 +1163,39 @@ void ip_ct_refresh_acct(struct ip_conntrack *ct,
}
}
#if defined(CONFIG_IP_NF_CONNTRACK_NETLINK) || \
defined(CONFIG_IP_NF_CONNTRACK_NETLINK_MODULE)
/* Generic function for tcp/udp/sctp/dccp and alike. This needs to be
* in ip_conntrack_core, since we don't want the protocols to autoload
* or depend on ctnetlink */
int ip_ct_port_tuple_to_nfattr(struct sk_buff *skb,
const struct ip_conntrack_tuple *tuple)
{
NFA_PUT(skb, CTA_PROTO_SRC_PORT, sizeof(u_int16_t),
&tuple->src.u.tcp.port);
NFA_PUT(skb, CTA_PROTO_DST_PORT, sizeof(u_int16_t),
&tuple->dst.u.tcp.port);
return 0;
nfattr_failure:
return -1;
}
int ip_ct_port_nfattr_to_tuple(struct nfattr *tb[],
struct ip_conntrack_tuple *t)
{
if (!tb[CTA_PROTO_SRC_PORT-1] || !tb[CTA_PROTO_DST_PORT-1])
return -EINVAL;
t->src.u.tcp.port =
*(u_int16_t *)NFA_DATA(tb[CTA_PROTO_SRC_PORT-1]);
t->dst.u.tcp.port =
*(u_int16_t *)NFA_DATA(tb[CTA_PROTO_DST_PORT-1]);
return 0;
}
#endif
/* Returns new sk_buff, or NULL */
struct sk_buff *
ip_ct_gather_frags(struct sk_buff *skb, u_int32_t user)
......@@ -1203,11 +1374,8 @@ static void free_conntrack_hash(void)
* ip_conntrack_htable_size));
}
/* Mishearing the voices in his head, our hero wonders how he's
supposed to kill the mall. */
void ip_conntrack_cleanup(void)
void ip_conntrack_flush()
{
ip_ct_attach = NULL;
/* This makes sure all current packets have passed through
netfilter framework. Roll on, two-stage module
delete... */
......@@ -1222,7 +1390,14 @@ void ip_conntrack_cleanup(void)
/* wait until all references to ip_conntrack_untracked are dropped */
while (atomic_read(&ip_conntrack_untracked.ct_general.use) > 1)
schedule();
}
/* Mishearing the voices in his head, our hero wonders how he's
supposed to kill the mall. */
void ip_conntrack_cleanup(void)
{
ip_ct_attach = NULL;
ip_conntrack_flush();
kmem_cache_destroy(ip_conntrack_cachep);
kmem_cache_destroy(ip_conntrack_expect_cachep);
free_conntrack_hash();
......
net/ipv4/netfilter/ip_conntrack_netlink.c 0 → 100644
浏览文件 @ 080774a2
/* Connection tracking via netlink socket. Allows for user space
* protocol helpers and general trouble making from userspace.
*
* (C) 2001 by Jay Schulist <jschlst@samba.org>
* (C) 2002-2005 by Harald Welte <laforge@gnumonks.org>
* (C) 2003 by Patrick Mchardy <kaber@trash.net>
* (C) 2005 by Pablo Neira Ayuso <pablo@eurodev.net>
*
* I've reworked this stuff to use attributes instead of conntrack
* structures. 5.44 am. I need more tea. --pablo 05/07/11.
*
* Initial connection tracking via netlink development funded and
* generally made possible by Network Robots, Inc. (www.networkrobots.com)
*
* Further development of this code funded by Astaro AG (http://www.astaro.com)
*
* This software may be used and distributed according to the terms
* of the GNU General Public License, incorporated herein by reference.
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/timer.h>
#include <linux/skbuff.h>
#include <linux/errno.h>
#include <linux/netlink.h>
#include <linux/spinlock.h>
#include <linux/notifier.h>
#include <linux/rtnetlink.h>
#include <linux/netfilter.h>
#include <linux/netfilter_ipv4.h>
#include <linux/netfilter_ipv4/ip_tables.h>
#include <linux/netfilter_ipv4/ip_conntrack.h>
#include <linux/netfilter_ipv4/ip_conntrack_core.h>
#include <linux/netfilter_ipv4/ip_conntrack_helper.h>
#include <linux/netfilter_ipv4/ip_conntrack_protocol.h>
#include <linux/netfilter_ipv4/ip_nat_protocol.h>
#include <linux/netfilter/nfnetlink.h>
#include <linux/netfilter/nfnetlink_conntrack.h>
MODULE_LICENSE("GPL");
static char __initdata version[] = "0.90";
#if 0
#define DEBUGP printk
#else
#define DEBUGP(format, args...)
#endif
static inline int
ctnetlink_dump_tuples_proto(struct sk_buff *skb,
const struct ip_conntrack_tuple *tuple)
{
struct ip_conntrack_protocol *proto;
NFA_PUT(skb, CTA_PROTO_NUM, sizeof(u_int8_t), &tuple->dst.protonum);
proto = ip_conntrack_proto_find_get(tuple->dst.protonum);
if (proto && proto->tuple_to_nfattr)
return proto->tuple_to_nfattr(skb, tuple);
return 0;
nfattr_failure:
return -1;
}
static inline int
ctnetlink_dump_tuples(struct sk_buff *skb,
const struct ip_conntrack_tuple *tuple)
{
struct nfattr *nest_parms;
nest_parms = NFA_NEST(skb, CTA_TUPLE_IP);
NFA_PUT(skb, CTA_IP_V4_SRC, sizeof(u_int32_t), &tuple->src.ip);
NFA_PUT(skb, CTA_IP_V4_DST, sizeof(u_int32_t), &tuple->dst.ip);
NFA_NEST_END(skb, nest_parms);
nest_parms = NFA_NEST(skb, CTA_TUPLE_PROTO);
ctnetlink_dump_tuples_proto(skb, tuple);
NFA_NEST_END(skb, nest_parms);
return 0;
nfattr_failure:
return -1;
}
static inline int
ctnetlink_dump_status(struct sk_buff *skb, const struct ip_conntrack *ct)
{
u_int32_t status = htonl((u_int32_t) ct->status);
NFA_PUT(skb, CTA_STATUS, sizeof(status), &status);
return 0;
nfattr_failure:
return -1;
}
static inline int
ctnetlink_dump_timeout(struct sk_buff *skb, const struct ip_conntrack *ct)
{
long timeout_l = ct->timeout.expires - jiffies;
u_int32_t timeout;
if (timeout_l < 0)
timeout = 0;
else
timeout = htonl(timeout_l / HZ);
NFA_PUT(skb, CTA_TIMEOUT, sizeof(timeout), &timeout);
return 0;
nfattr_failure:
return -1;
}
static inline int
ctnetlink_dump_protoinfo(struct sk_buff *skb, const struct ip_conntrack *ct)
{
struct ip_conntrack_protocol *proto = ip_conntrack_proto_find_get(ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum);
struct nfattr *nest_proto;
int ret;
if (!proto || !proto->to_nfattr)
return 0;
nest_proto = NFA_NEST(skb, CTA_PROTOINFO);
ret = proto->to_nfattr(skb, nest_proto, ct);
ip_conntrack_proto_put(proto);
NFA_NEST_END(skb, nest_proto);
return ret;
nfattr_failure:
return -1;
}
static inline int
ctnetlink_dump_helpinfo(struct sk_buff *skb, const struct ip_conntrack *ct)
{
struct nfattr *nest_helper;
if (!ct->helper)
return 0;
nest_helper = NFA_NEST(skb, CTA_HELP);
NFA_PUT(skb, CTA_HELP_NAME, CTA_HELP_MAXNAMESIZE, &ct->helper->name);
if (ct->helper->to_nfattr)
ct->helper->to_nfattr(skb, ct);
NFA_NEST_END(skb, nest_helper);
return 0;
nfattr_failure:
return -1;
}
#ifdef CONFIG_IP_NF_CT_ACCT
static inline int
ctnetlink_dump_counters(struct sk_buff *skb, const struct ip_conntrack *ct,
enum ip_conntrack_dir dir)
{
enum ctattr_type type = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
struct nfattr *nest_count = NFA_NEST(skb, type);
u_int64_t tmp;
tmp = cpu_to_be64(ct->counters[dir].packets);
NFA_PUT(skb, CTA_COUNTERS_PACKETS, sizeof(u_int64_t), &tmp);
tmp = cpu_to_be64(ct->counters[dir].bytes);
NFA_PUT(skb, CTA_COUNTERS_BYTES, sizeof(u_int64_t), &tmp);
NFA_NEST_END(skb, nest_count);
return 0;
nfattr_failure:
return -1;
}
#else
#define ctnetlink_dump_counters(a, b, c) (0)
#endif
#ifdef CONFIG_IP_NF_CONNTRACK_MARK
static inline int
ctnetlink_dump_mark(struct sk_buff *skb, const struct ip_conntrack *ct)
{
u_int32_t mark = htonl(ct->mark);
NFA_PUT(skb, CTA_MARK, sizeof(u_int32_t), &mark);
return 0;
nfattr_failure:
return -1;
}
#else
#define ctnetlink_dump_mark(a, b) (0)
#endif
static inline int
ctnetlink_dump_id(struct sk_buff *skb, const struct ip_conntrack *ct)
{
u_int32_t id = htonl(ct->id);
NFA_PUT(skb, CTA_ID, sizeof(u_int32_t), &id);
return 0;
nfattr_failure:
return -1;
}
static inline int
ctnetlink_dump_use(struct sk_buff *skb, const struct ip_conntrack *ct)
{
unsigned int use = htonl(atomic_read(&ct->ct_general.use));
NFA_PUT(skb, CTA_USE, sizeof(u_int32_t), &use);
return 0;
nfattr_failure:
return -1;
}
#define tuple(ct, dir) (&(ct)->tuplehash[dir].tuple)
static int
ctnetlink_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
int event, int nowait,
const struct ip_conntrack *ct)
{
struct nlmsghdr *nlh;
struct nfgenmsg *nfmsg;
struct nfattr *nest_parms;
unsigned char *b;
b = skb->tail;
event |= NFNL_SUBSYS_CTNETLINK << 8;
nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg));
nfmsg = NLMSG_DATA(nlh);
nlh->nlmsg_flags = (nowait && pid) ? NLM_F_MULTI : 0;
nfmsg->nfgen_family = AF_INET;
nfmsg->version = NFNETLINK_V0;
nfmsg->res_id = 0;
nest_parms = NFA_NEST(skb, CTA_TUPLE_ORIG);
if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
goto nfattr_failure;
NFA_NEST_END(skb, nest_parms);
nest_parms = NFA_NEST(skb, CTA_TUPLE_REPLY);
if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_REPLY)) < 0)
goto nfattr_failure;
NFA_NEST_END(skb, nest_parms);
if (ctnetlink_dump_status(skb, ct) < 0 ||
ctnetlink_dump_timeout(skb, ct) < 0 ||
ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0 ||
ctnetlink_dump_protoinfo(skb, ct) < 0 ||
ctnetlink_dump_helpinfo(skb, ct) < 0 ||
ctnetlink_dump_mark(skb, ct) < 0 ||
ctnetlink_dump_id(skb, ct) < 0 ||
ctnetlink_dump_use(skb, ct) < 0)
goto nfattr_failure;
nlh->nlmsg_len = skb->tail - b;
return skb->len;
nlmsg_failure:
nfattr_failure:
skb_trim(skb, b - skb->data);
return -1;
}
#ifdef CONFIG_IP_NF_CONNTRACK_EVENTS
static int ctnetlink_conntrack_event(struct notifier_block *this,
unsigned long events, void *ptr)
{
struct nlmsghdr *nlh;
struct nfgenmsg *nfmsg;
struct nfattr *nest_parms;
struct ip_conntrack *ct = (struct ip_conntrack *)ptr;
struct sk_buff *skb;
unsigned int type;
unsigned char *b;
unsigned int flags = 0, groups;
/* ignore our fake conntrack entry */
if (ct == &ip_conntrack_untracked)
return NOTIFY_DONE;
if (events & IPCT_DESTROY) {
type = IPCTNL_MSG_CT_DELETE;
groups = NF_NETLINK_CONNTRACK_DESTROY;
goto alloc_skb;
}
if (events & (IPCT_NEW | IPCT_RELATED)) {
type = IPCTNL_MSG_CT_NEW;
flags = NLM_F_CREATE|NLM_F_EXCL;
/* dump everything */
events = ~0UL;
groups = NF_NETLINK_CONNTRACK_NEW;
goto alloc_skb;
}
if (events & (IPCT_STATUS |
IPCT_PROTOINFO |
IPCT_HELPER |
IPCT_HELPINFO |
IPCT_NATINFO)) {
type = IPCTNL_MSG_CT_NEW;
groups = NF_NETLINK_CONNTRACK_UPDATE;
goto alloc_skb;
}
return NOTIFY_DONE;
alloc_skb:
/* FIXME: Check if there are any listeners before, don't hurt performance */
skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
if (!skb)
return NOTIFY_DONE;
b = skb->tail;
type |= NFNL_SUBSYS_CTNETLINK << 8;
nlh = NLMSG_PUT(skb, 0, 0, type, sizeof(struct nfgenmsg));
nfmsg = NLMSG_DATA(nlh);
nlh->nlmsg_flags = flags;
nfmsg->nfgen_family = AF_INET;
nfmsg->version = NFNETLINK_V0;
nfmsg->res_id = 0;
nest_parms = NFA_NEST(skb, CTA_TUPLE_ORIG);
if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
goto nfattr_failure;
NFA_NEST_END(skb, nest_parms);
nest_parms = NFA_NEST(skb, CTA_TUPLE_REPLY);
if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_REPLY)) < 0)
goto nfattr_failure;
NFA_NEST_END(skb, nest_parms);
/* NAT stuff is now a status flag */
if ((events & IPCT_STATUS || events & IPCT_NATINFO)
&& ctnetlink_dump_status(skb, ct) < 0)
goto nfattr_failure;
if (events & IPCT_REFRESH
&& ctnetlink_dump_timeout(skb, ct) < 0)
goto nfattr_failure;
if (events & IPCT_PROTOINFO
&& ctnetlink_dump_protoinfo(skb, ct) < 0)
goto nfattr_failure;
if (events & IPCT_HELPINFO
&& ctnetlink_dump_helpinfo(skb, ct) < 0)
goto nfattr_failure;
if (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0)
goto nfattr_failure;
nlh->nlmsg_len = skb->tail - b;
nfnetlink_send(skb, 0, groups, 0);
return NOTIFY_DONE;
nlmsg_failure:
nfattr_failure:
kfree_skb(skb);
return NOTIFY_DONE;
}
#endif /* CONFIG_IP_NF_CONNTRACK_EVENTS */
static int ctnetlink_done(struct netlink_callback *cb)
{
DEBUGP("entered %s\n", __FUNCTION__);
return 0;
}
static int
ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
{
struct ip_conntrack *ct = NULL;
struct ip_conntrack_tuple_hash *h;
struct list_head *i;
u_int32_t *id = (u_int32_t *) &cb->args[1];
DEBUGP("entered %s, last bucket=%lu id=%u\n", __FUNCTION__,
cb->args[0], *id);
read_lock_bh(&ip_conntrack_lock);
for (; cb->args[0] < ip_conntrack_htable_size; cb->args[0]++, *id = 0) {
list_for_each(i, &ip_conntrack_hash[cb->args[0]]) {
h = (struct ip_conntrack_tuple_hash *) i;
if (DIRECTION(h) != IP_CT_DIR_ORIGINAL)
continue;
ct = tuplehash_to_ctrack(h);
if (ct->id <= *id)
continue;
if (ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).pid,
cb->nlh->nlmsg_seq,
IPCTNL_MSG_CT_NEW,
1, ct) < 0)
goto out;
*id = ct->id;
}
}
out:
read_unlock_bh(&ip_conntrack_lock);
DEBUGP("leaving, last bucket=%lu id=%u\n", cb->args[0], *id);
return skb->len;
}
#ifdef CONFIG_IP_NF_CT_ACCT
static int
ctnetlink_dump_table_w(struct sk_buff *skb, struct netlink_callback *cb)
{
struct ip_conntrack *ct = NULL;
struct ip_conntrack_tuple_hash *h;
struct list_head *i;
u_int32_t *id = (u_int32_t *) &cb->args[1];
DEBUGP("entered %s, last bucket=%u id=%u\n", __FUNCTION__,
cb->args[0], *id);
write_lock_bh(&ip_conntrack_lock);
for (; cb->args[0] < ip_conntrack_htable_size; cb->args[0]++, *id = 0) {
list_for_each(i, &ip_conntrack_hash[cb->args[0]]) {
h = (struct ip_conntrack_tuple_hash *) i;
if (DIRECTION(h) != IP_CT_DIR_ORIGINAL)
continue;
ct = tuplehash_to_ctrack(h);
if (ct->id <= *id)
continue;
if (ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).pid,
cb->nlh->nlmsg_seq,
IPCTNL_MSG_CT_NEW,
1, ct) < 0)
goto out;
*id = ct->id;
memset(&ct->counters, 0, sizeof(ct->counters));
}
}
out:
write_unlock_bh(&ip_conntrack_lock);
DEBUGP("leaving, last bucket=%lu id=%u\n", cb->args[0], *id);
return skb->len;
}
#endif
static const int cta_min_ip[CTA_IP_MAX] = {
[CTA_IP_V4_SRC-1] = sizeof(u_int32_t),
[CTA_IP_V4_DST-1] = sizeof(u_int32_t),
};
static inline int
ctnetlink_parse_tuple_ip(struct nfattr *attr, struct ip_conntrack_tuple *tuple)
{
struct nfattr *tb[CTA_IP_MAX];
DEBUGP("entered %s\n", __FUNCTION__);
memset(tb, 0, CTA_IP_MAX * sizeof(tb));
if (nfattr_parse_nested(tb, CTA_IP_MAX, attr) < 0)
goto nfattr_failure;
if (nfattr_bad_size(tb, CTA_IP_MAX, cta_min_ip))
return -EINVAL;
if (!tb[CTA_IP_V4_SRC-1])
return -EINVAL;
tuple->src.ip = *(u_int32_t *)NFA_DATA(tb[CTA_IP_V4_SRC-1]);
if (!tb[CTA_IP_V4_DST-1])
return -EINVAL;
tuple->dst.ip = *(u_int32_t *)NFA_DATA(tb[CTA_IP_V4_DST-1]);
DEBUGP("leaving\n");
return 0;
nfattr_failure:
return -1;
}
static const int cta_min_proto[CTA_PROTO_MAX] = {
[CTA_PROTO_NUM-1] = sizeof(u_int16_t),
[CTA_PROTO_SRC_PORT-1] = sizeof(u_int16_t),
[CTA_PROTO_DST_PORT-1] = sizeof(u_int16_t),
[CTA_PROTO_ICMP_TYPE-1] = sizeof(u_int8_t),
[CTA_PROTO_ICMP_CODE-1] = sizeof(u_int8_t),
[CTA_PROTO_ICMP_ID-1] = sizeof(u_int16_t),
};
static inline int
ctnetlink_parse_tuple_proto(struct nfattr *attr,
struct ip_conntrack_tuple *tuple)
{
struct nfattr *tb[CTA_PROTO_MAX];
struct ip_conntrack_protocol *proto;
int ret = 0;
DEBUGP("entered %s\n", __FUNCTION__);
memset(tb, 0, CTA_PROTO_MAX * sizeof(tb));
if (nfattr_parse_nested(tb, CTA_PROTO_MAX, attr) < 0)
goto nfattr_failure;
if (nfattr_bad_size(tb, CTA_PROTO_MAX, cta_min_proto))
return -EINVAL;
if (!tb[CTA_PROTO_NUM-1])
return -EINVAL;
tuple->dst.protonum = *(u_int16_t *)NFA_DATA(tb[CTA_PROTO_NUM-1]);
proto = ip_conntrack_proto_find_get(tuple->dst.protonum);
if (likely(proto && proto->nfattr_to_tuple)) {
ret = proto->nfattr_to_tuple(tb, tuple);
ip_conntrack_proto_put(proto);
}
return ret;
nfattr_failure:
return -1;
}
static inline int
ctnetlink_parse_tuple(struct nfattr *cda[], struct ip_conntrack_tuple *tuple,
enum ctattr_tuple type)
{
struct nfattr *tb[CTA_TUPLE_MAX];
int err;
DEBUGP("entered %s\n", __FUNCTION__);
memset(tb, 0, CTA_TUPLE_MAX * sizeof(tb));
memset(tuple, 0, sizeof(*tuple));
if (nfattr_parse_nested(tb, CTA_TUPLE_MAX, cda[type-1]) < 0)
goto nfattr_failure;
if (!tb[CTA_TUPLE_IP-1])
return -EINVAL;
err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP-1], tuple);
if (err < 0)
return err;
if (!tb[CTA_TUPLE_PROTO-1])
return -EINVAL;
err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO-1], tuple);
if (err < 0)
return err;
/* orig and expect tuples get DIR_ORIGINAL */
if (type == CTA_TUPLE_REPLY)
tuple->dst.dir = IP_CT_DIR_REPLY;
else
tuple->dst.dir = IP_CT_DIR_ORIGINAL;
DUMP_TUPLE(tuple);
DEBUGP("leaving\n");
return 0;
nfattr_failure:
return -1;
}
#ifdef CONFIG_IP_NF_NAT_NEEDED
static const int cta_min_protonat[CTA_PROTONAT_MAX] = {
[CTA_PROTONAT_PORT_MIN-1] = sizeof(u_int16_t),
[CTA_PROTONAT_PORT_MAX-1] = sizeof(u_int16_t),
};
static int ctnetlink_parse_nat_proto(struct nfattr *attr,
const struct ip_conntrack *ct,
struct ip_nat_range *range)
{
struct nfattr *tb[CTA_PROTONAT_MAX];
struct ip_nat_protocol *npt;
DEBUGP("entered %s\n", __FUNCTION__);
memset(tb, 0, CTA_PROTONAT_MAX * sizeof(tb));
if (nfattr_parse_nested(tb, CTA_PROTONAT_MAX, attr) < 0)
goto nfattr_failure;
if (nfattr_bad_size(tb, CTA_PROTONAT_MAX, cta_min_protonat))
goto nfattr_failure;
npt = ip_nat_proto_find_get(ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum);
if (!npt)
return 0;
if (!npt->nfattr_to_range) {
ip_nat_proto_put(npt);
return 0;
}
/* nfattr_to_range returns 1 if it parsed, 0 if not, neg. on error */
if (npt->nfattr_to_range(tb, range) > 0)
range->flags |= IP_NAT_RANGE_PROTO_SPECIFIED;
ip_nat_proto_put(npt);
DEBUGP("leaving\n");
return 0;
nfattr_failure:
return -1;
}
static inline int
ctnetlink_parse_nat(struct nfattr *cda[],
const struct ip_conntrack *ct, struct ip_nat_range *range)
{
struct nfattr *tb[CTA_NAT_MAX];
int err;
DEBUGP("entered %s\n", __FUNCTION__);
memset(tb, 0, CTA_NAT_MAX * sizeof(tb));
memset(range, 0, sizeof(*range));
if (nfattr_parse_nested(tb, CTA_NAT_MAX, cda[CTA_NAT-1]) < 0)
goto nfattr_failure;
if (tb[CTA_NAT_MINIP-1])
range->min_ip = *(u_int32_t *)NFA_DATA(tb[CTA_NAT_MINIP-1]);
if (!tb[CTA_NAT_MAXIP-1])
range->max_ip = range->min_ip;
else
range->max_ip = *(u_int32_t *)NFA_DATA(tb[CTA_NAT_MAXIP-1]);
if (range->min_ip)
range->flags |= IP_NAT_RANGE_MAP_IPS;
if (!tb[CTA_NAT_PROTO-1])
return 0;
err = ctnetlink_parse_nat_proto(tb[CTA_NAT_PROTO-1], ct, range);
if (err < 0)
return err;
DEBUGP("leaving\n");
return 0;
nfattr_failure:
return -1;
}
#endif
static inline int
ctnetlink_parse_help(struct nfattr *attr, char **helper_name)
{
struct nfattr *tb[CTA_HELP_MAX];
DEBUGP("entered %s\n", __FUNCTION__);
memset(tb, 0, CTA_HELP_MAX * sizeof(tb));
if (nfattr_parse_nested(tb, CTA_HELP_MAX, attr) < 0)
goto nfattr_failure;
if (!tb[CTA_HELP_NAME-1])
return -EINVAL;
*helper_name = NFA_DATA(tb[CTA_HELP_NAME-1]);
return 0;
nfattr_failure:
return -1;
}
static int
ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb,
struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
{
struct ip_conntrack_tuple_hash *h;
struct ip_conntrack_tuple tuple;
struct ip_conntrack *ct;
int err = 0;
DEBUGP("entered %s\n", __FUNCTION__);
if (cda[CTA_TUPLE_ORIG-1])
err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG);
else if (cda[CTA_TUPLE_REPLY-1])
err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY);
else {
/* Flush the whole table */
ip_conntrack_flush();
return 0;
}
if (err < 0)
return err;
h = ip_conntrack_find_get(&tuple, NULL);
if (!h) {
DEBUGP("tuple not found in conntrack hash\n");
return -ENOENT;
}
ct = tuplehash_to_ctrack(h);
if (cda[CTA_ID-1]) {
u_int32_t id = ntohl(*(u_int32_t *)NFA_DATA(cda[CTA_ID-1]));
if (ct->id != id) {
ip_conntrack_put(ct);
return -ENOENT;
}
}
if (del_timer(&ct->timeout)) {
ip_conntrack_put(ct);
ct->timeout.function((unsigned long)ct);
return 0;
}
ip_conntrack_put(ct);
DEBUGP("leaving\n");
return 0;
}
static int
ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
{
struct ip_conntrack_tuple_hash *h;
struct ip_conntrack_tuple tuple;
struct ip_conntrack *ct;
struct sk_buff *skb2 = NULL;
int err = 0;
DEBUGP("entered %s\n", __FUNCTION__);
if (nlh->nlmsg_flags & NLM_F_DUMP) {
struct nfgenmsg *msg = NLMSG_DATA(nlh);
u32 rlen;
if (msg->nfgen_family != AF_INET)
return -EAFNOSUPPORT;
if (NFNL_MSG_TYPE(nlh->nlmsg_type) ==
IPCTNL_MSG_CT_GET_CTRZERO) {
#ifdef CONFIG_IP_NF_CT_ACCT
if ((*errp = netlink_dump_start(ctnl, skb, nlh,
ctnetlink_dump_table_w,
ctnetlink_done)) != 0)
return -EINVAL;
#else
return -ENOTSUPP;
#endif
} else {
if ((*errp = netlink_dump_start(ctnl, skb, nlh,
ctnetlink_dump_table,
ctnetlink_done)) != 0)
return -EINVAL;
}
rlen = NLMSG_ALIGN(nlh->nlmsg_len);
if (rlen > skb->len)
rlen = skb->len;
skb_pull(skb, rlen);
return 0;
}
if (cda[CTA_TUPLE_ORIG-1])
err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG);
else if (cda[CTA_TUPLE_REPLY-1])
err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY);
else
return -EINVAL;
if (err < 0)
return err;
h = ip_conntrack_find_get(&tuple, NULL);
if (!h) {
DEBUGP("tuple not found in conntrack hash");
return -ENOENT;
}
DEBUGP("tuple found\n");
ct = tuplehash_to_ctrack(h);
err = -ENOMEM;
skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
if (!skb2) {
ip_conntrack_put(ct);
return -ENOMEM;
}
NETLINK_CB(skb2).dst_pid = NETLINK_CB(skb).pid;
err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq,
IPCTNL_MSG_CT_NEW, 1, ct);
ip_conntrack_put(ct);
if (err <= 0)
goto out;
err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
if (err < 0)
goto out;
DEBUGP("leaving\n");
return 0;
out:
if (skb2)
kfree_skb(skb2);
return -1;
}
static inline int
ctnetlink_change_status(struct ip_conntrack *ct, struct nfattr *cda[])
{
unsigned long d, status = *(u_int32_t *)NFA_DATA(cda[CTA_STATUS-1]);
d = ct->status ^ status;
if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
/* unchangeable */
return -EINVAL;
if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
/* SEEN_REPLY bit can only be set */
return -EINVAL;
if (d & IPS_ASSURED && !(status & IPS_ASSURED))
/* ASSURED bit can only be set */
return -EINVAL;
if (cda[CTA_NAT-1]) {
#ifndef CONFIG_IP_NF_NAT_NEEDED
return -EINVAL;
#else
unsigned int hooknum;
struct ip_nat_range range;
if (ctnetlink_parse_nat(cda, ct, &range) < 0)
return -EINVAL;
DEBUGP("NAT: %u.%u.%u.%u-%u.%u.%u.%u:%u-%u\n",
NIPQUAD(range.min_ip), NIPQUAD(range.max_ip),
htons(range.min.all), htons(range.max.all));
/* This is tricky but it works. ip_nat_setup_info needs the
* hook number as parameter, so let's do the correct
* conversion and run away */
if (status & IPS_SRC_NAT_DONE)
hooknum = NF_IP_POST_ROUTING; /* IP_NAT_MANIP_SRC */
else if (status & IPS_DST_NAT_DONE)
hooknum = NF_IP_PRE_ROUTING; /* IP_NAT_MANIP_DST */
else
return -EINVAL; /* Missing NAT flags */
DEBUGP("NAT status: %lu\n",
status & (IPS_NAT_MASK | IPS_NAT_DONE_MASK));
if (ip_nat_initialized(ct, hooknum))
return -EEXIST;
ip_nat_setup_info(ct, &range, hooknum);
DEBUGP("NAT status after setup_info: %lu\n",
ct->status & (IPS_NAT_MASK | IPS_NAT_DONE_MASK));
#endif
}
/* Be careful here, modifying NAT bits can screw up things,
* so don't let users modify them directly if they don't pass
* ip_nat_range. */
ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK);
return 0;
}
static inline int
ctnetlink_change_helper(struct ip_conntrack *ct, struct nfattr *cda[])
{
struct ip_conntrack_helper *helper;
char *helpname;
int err;
DEBUGP("entered %s\n", __FUNCTION__);
/* don't change helper of sibling connections */
if (ct->master)
return -EINVAL;
err = ctnetlink_parse_help(cda[CTA_HELP-1], &helpname);
if (err < 0)
return err;
helper = __ip_conntrack_helper_find_byname(helpname);
if (!helper) {
if (!strcmp(helpname, ""))
helper = NULL;
else
return -EINVAL;
}
if (ct->helper) {
if (!helper) {
/* we had a helper before ... */
ip_ct_remove_expectations(ct);
ct->helper = NULL;
} else {
/* need to zero data of old helper */
memset(&ct->help, 0, sizeof(ct->help));
}
}
ct->helper = helper;
return 0;
}
static inline int
ctnetlink_change_timeout(struct ip_conntrack *ct, struct nfattr *cda[])
{
u_int32_t timeout = ntohl(*(u_int32_t *)NFA_DATA(cda[CTA_TIMEOUT-1]));
if (!del_timer(&ct->timeout))
return -ETIME;
ct->timeout.expires = jiffies + timeout * HZ;
add_timer(&ct->timeout);
return 0;
}
static int
ctnetlink_change_conntrack(struct ip_conntrack *ct, struct nfattr *cda[])
{
int err;
DEBUGP("entered %s\n", __FUNCTION__);
if (cda[CTA_HELP-1]) {
err = ctnetlink_change_helper(ct, cda);
if (err < 0)
return err;
}
if (cda[CTA_TIMEOUT-1]) {
err = ctnetlink_change_timeout(ct, cda);
if (err < 0)
return err;
}
if (cda[CTA_STATUS-1]) {
err = ctnetlink_change_status(ct, cda);
if (err < 0)
return err;
}
DEBUGP("all done\n");
return 0;
}
static int
ctnetlink_create_conntrack(struct nfattr *cda[],
struct ip_conntrack_tuple *otuple,
struct ip_conntrack_tuple *rtuple)
{
struct ip_conntrack *ct;
int err = -EINVAL;
DEBUGP("entered %s\n", __FUNCTION__);
ct = ip_conntrack_alloc(otuple, rtuple);
if (ct == NULL || IS_ERR(ct))
return -ENOMEM;
if (!cda[CTA_TIMEOUT-1])
goto err;
ct->timeout.expires = ntohl(*(u_int32_t *)NFA_DATA(cda[CTA_TIMEOUT-1]));
ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
ct->status |= IPS_CONFIRMED;
err = ctnetlink_change_status(ct, cda);
if (err < 0)
goto err;
ct->helper = ip_conntrack_helper_find_get(rtuple);
add_timer(&ct->timeout);
ip_conntrack_hash_insert(ct);
if (ct->helper)
ip_conntrack_helper_put(ct->helper);
DEBUGP("conntrack with id %u inserted\n", ct->id);
return 0;
err:
ip_conntrack_free(ct);
return err;
}
static int
ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
{
struct ip_conntrack_tuple otuple, rtuple;
struct ip_conntrack_tuple_hash *h = NULL;
int err = 0;
DEBUGP("entered %s\n", __FUNCTION__);
if (cda[CTA_TUPLE_ORIG-1]) {
err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG);
if (err < 0)
return err;
}
if (cda[CTA_TUPLE_REPLY-1]) {
err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY);
if (err < 0)
return err;
}
write_lock_bh(&ip_conntrack_lock);
if (cda[CTA_TUPLE_ORIG-1])
h = __ip_conntrack_find(&otuple, NULL);
else if (cda[CTA_TUPLE_REPLY-1])
h = __ip_conntrack_find(&rtuple, NULL);
if (h == NULL) {
write_unlock_bh(&ip_conntrack_lock);
DEBUGP("no such conntrack, create new\n");
err = -ENOENT;
if (nlh->nlmsg_flags & NLM_F_CREATE)
err = ctnetlink_create_conntrack(cda, &otuple, &rtuple);
goto out_unlock;
} else {
/* we only allow nat config for new conntracks */
if (cda[CTA_NAT-1]) {
err = -EINVAL;
goto out_unlock;
}
}
/* We manipulate the conntrack inside the global conntrack table lock,
* so there's no need to increase the refcount */
DEBUGP("conntrack found\n");
err = -EEXIST;
if (!(nlh->nlmsg_flags & NLM_F_EXCL))
err = ctnetlink_change_conntrack(tuplehash_to_ctrack(h), cda);
out_unlock:
write_unlock_bh(&ip_conntrack_lock);
return err;
}
/***********************************************************************
* EXPECT
***********************************************************************/
static inline int
ctnetlink_exp_dump_tuple(struct sk_buff *skb,
const struct ip_conntrack_tuple *tuple,
enum ctattr_expect type)
{
struct nfattr *nest_parms = NFA_NEST(skb, type);
if (ctnetlink_dump_tuples(skb, tuple) < 0)
goto nfattr_failure;
NFA_NEST_END(skb, nest_parms);
return 0;
nfattr_failure:
return -1;
}
static inline int
ctnetlink_exp_dump_expect(struct sk_buff *skb,
const struct ip_conntrack_expect *exp)
{
u_int32_t timeout = htonl((exp->timeout.expires - jiffies) / HZ);
u_int32_t id = htonl(exp->id);
struct nfattr *nest_parms = NFA_NEST(skb, CTA_EXPECT);
if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
goto nfattr_failure;
if (ctnetlink_exp_dump_tuple(skb, &exp->mask, CTA_EXPECT_MASK) < 0)
goto nfattr_failure;
NFA_PUT(skb, CTA_EXPECT_TIMEOUT, sizeof(timeout), &timeout);
NFA_PUT(skb, CTA_EXPECT_ID, sizeof(u_int32_t), &id);
NFA_NEST_END(skb, nest_parms);
return 0;
nfattr_failure:
return -1;
}
static int
ctnetlink_exp_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
int event,
int nowait,
const struct ip_conntrack_expect *exp)
{
struct nlmsghdr *nlh;
struct nfgenmsg *nfmsg;
unsigned char *b;
b = skb->tail;
event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg));
nfmsg = NLMSG_DATA(nlh);
nlh->nlmsg_flags = (nowait && pid) ? NLM_F_MULTI : 0;
nfmsg->nfgen_family = AF_INET;
nfmsg->version = NFNETLINK_V0;
nfmsg->res_id = 0;
if (ctnetlink_exp_dump_expect(skb, exp) < 0)
goto nfattr_failure;
nlh->nlmsg_len = skb->tail - b;
return skb->len;
nlmsg_failure:
nfattr_failure:
skb_trim(skb, b - skb->data);
return -1;
}
#ifdef CONFIG_IP_NF_CONNTRACK_EVENTS
static int ctnetlink_expect_event(struct notifier_block *this,
unsigned long events, void *ptr)
{
struct nlmsghdr *nlh;
struct nfgenmsg *nfmsg;
struct ip_conntrack_expect *exp = (struct ip_conntrack_expect *)ptr;
struct sk_buff *skb;
unsigned int type;
unsigned char *b;
int flags = 0;
u16 proto;
if (events & IPEXP_NEW) {
type = IPCTNL_MSG_EXP_NEW;
flags = NLM_F_CREATE|NLM_F_EXCL;
} else
return NOTIFY_DONE;
skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
if (!skb)
return NOTIFY_DONE;
b = skb->tail;
type |= NFNL_SUBSYS_CTNETLINK << 8;
nlh = NLMSG_PUT(skb, 0, 0, type, sizeof(struct nfgenmsg));
nfmsg = NLMSG_DATA(nlh);
nlh->nlmsg_flags = flags;
nfmsg->nfgen_family = AF_INET;
nfmsg->version = NFNETLINK_V0;
nfmsg->res_id = 0;
if (ctnetlink_exp_dump_expect(skb, exp) < 0)
goto nfattr_failure;
nlh->nlmsg_len = skb->tail - b;
proto = exp->tuple.dst.protonum;
nfnetlink_send(skb, 0, NF_NETLINK_CONNTRACK_EXP_NEW, 0);
return NOTIFY_DONE;
nlmsg_failure:
nfattr_failure:
kfree_skb(skb);
return NOTIFY_DONE;
}
#endif
static int
ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
{
struct ip_conntrack_expect *exp = NULL;
struct list_head *i;
u_int32_t *id = (u_int32_t *) &cb->args[0];
DEBUGP("entered %s, last id=%llu\n", __FUNCTION__, *id);
read_lock_bh(&ip_conntrack_lock);
list_for_each(i, &ip_conntrack_expect_list) {
exp = (struct ip_conntrack_expect *) i;
if (exp->id <= *id)
continue;
if (ctnetlink_exp_fill_info(skb, NETLINK_CB(cb->skb).pid,
cb->nlh->nlmsg_seq,
IPCTNL_MSG_EXP_NEW,
1, exp) < 0)
goto out;
*id = exp->id;
}
out:
read_unlock_bh(&ip_conntrack_lock);
DEBUGP("leaving, last id=%llu\n", *id);
return skb->len;
}
static int
ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
{
struct ip_conntrack_tuple tuple;
struct ip_conntrack_expect *exp;
struct sk_buff *skb2;
int err = 0;
DEBUGP("entered %s\n", __FUNCTION__);
if (nlh->nlmsg_flags & NLM_F_DUMP) {
struct nfgenmsg *msg = NLMSG_DATA(nlh);
u32 rlen;
if (msg->nfgen_family != AF_INET)
return -EAFNOSUPPORT;
if ((*errp = netlink_dump_start(ctnl, skb, nlh,
ctnetlink_exp_dump_table,
ctnetlink_done)) != 0)
return -EINVAL;
rlen = NLMSG_ALIGN(nlh->nlmsg_len);
if (rlen > skb->len)
rlen = skb->len;
skb_pull(skb, rlen);
return 0;
}
if (cda[CTA_TUPLE_ORIG-1])
err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG);
else if (cda[CTA_TUPLE_REPLY-1])
err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY);
else
return -EINVAL;
if (err < 0)
return err;
exp = ip_conntrack_expect_find_get(&tuple);
if (!exp)
return -ENOENT;
err = -ENOMEM;
skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
if (!skb2)
goto out;
NETLINK_CB(skb2).dst_pid = NETLINK_CB(skb).pid;
err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).pid,
nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW,
1, exp);
if (err <= 0)
goto out;
ip_conntrack_expect_put(exp);
err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
if (err < 0)
goto free;
return err;
out:
ip_conntrack_expect_put(exp);
free:
if (skb2)
kfree_skb(skb2);
return err;
}
static int
ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
{
struct ip_conntrack_expect *exp, *tmp;
struct ip_conntrack_tuple tuple;
struct ip_conntrack_helper *h;
int err;
/* delete by tuple needs either orig or reply tuple */
if (cda[CTA_TUPLE_ORIG-1])
err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG);
else if (cda[CTA_TUPLE_REPLY-1])
err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY);
else if (cda[CTA_HELP_NAME-1]) {
char *name = NFA_DATA(cda[CTA_HELP_NAME-1]);
/* delete all expectations for this helper */
write_lock_bh(&ip_conntrack_lock);
h = __ip_conntrack_helper_find_byname(name);
if (!h) {
write_unlock_bh(&ip_conntrack_lock);
return -EINVAL;
}
list_for_each_entry_safe(exp, tmp, &ip_conntrack_expect_list,
list) {
if (exp->master->helper == h
&& del_timer(&exp->timeout))
__ip_ct_expect_unlink_destroy(exp);
}
write_unlock(&ip_conntrack_lock);
return 0;
} else {
/* This basically means we have to flush everything*/
write_lock_bh(&ip_conntrack_lock);
list_for_each_entry_safe(exp, tmp, &ip_conntrack_expect_list,
list) {
if (del_timer(&exp->timeout))
__ip_ct_expect_unlink_destroy(exp);
}
write_unlock_bh(&ip_conntrack_lock);
return 0;
}
if (err < 0)
return err;
/* bump usage count to 2 */
exp = ip_conntrack_expect_find_get(&tuple);
if (!exp)
return -ENOENT;
if (cda[CTA_EXPECT_ID-1]) {
u_int32_t id = *(u_int32_t *)NFA_DATA(cda[CTA_EXPECT_ID-1]);
if (exp->id != ntohl(id)) {
ip_conntrack_expect_put(exp);
return -ENOENT;
}
}
/* after list removal, usage count == 1 */
ip_conntrack_unexpect_related(exp);
/* have to put what we 'get' above. after this line usage count == 0 */
ip_conntrack_expect_put(exp);
return 0;
}
static int
ctnetlink_change_expect(struct ip_conntrack_expect *x, struct nfattr *cda[])
{
return -EOPNOTSUPP;
}
static int
ctnetlink_create_expect(struct nfattr *cda[])
{
struct ip_conntrack_tuple tuple, mask, master_tuple;
struct ip_conntrack_tuple_hash *h = NULL;
struct ip_conntrack_expect *exp;
struct ip_conntrack *ct;
int err = 0;
DEBUGP("entered %s\n", __FUNCTION__);
err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE);
if (err < 0)
return err;
err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASK);
if (err < 0)
return err;
if (cda[CTA_TUPLE_ORIG-1])
err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_TUPLE_ORIG);
else if (cda[CTA_TUPLE_REPLY-1])
err = ctnetlink_parse_tuple(cda, &master_tuple,
CTA_TUPLE_REPLY);
else
return -EINVAL;
if (err < 0)
return err;
/* Look for master conntrack of this expectation */
h = ip_conntrack_find_get(&master_tuple, NULL);
if (!h)
return -ENOENT;
ct = tuplehash_to_ctrack(h);
if (!ct->helper) {
/* such conntrack hasn't got any helper, abort */
err = -EINVAL;
goto out;
}
exp = ip_conntrack_expect_alloc(ct);
if (!exp) {
err = -ENOMEM;
goto out;
}
exp->expectfn = NULL;
exp->master = ct;
memcpy(&exp->tuple, &tuple, sizeof(struct ip_conntrack_tuple));
memcpy(&exp->mask, &mask, sizeof(struct ip_conntrack_tuple));
err = ip_conntrack_expect_related(exp);
ip_conntrack_expect_put(exp);
out:
ip_conntrack_put(tuplehash_to_ctrack(h));
return err;
}
static int
ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
{
struct ip_conntrack_tuple tuple;
struct ip_conntrack_expect *exp;
int err = 0;
DEBUGP("entered %s\n", __FUNCTION__);
if (!cda[CTA_EXPECT_TUPLE-1] || !cda[CTA_EXPECT_MASK-1])
return -EINVAL;
err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE);
if (err < 0)
return err;
write_lock_bh(&ip_conntrack_lock);
exp = __ip_conntrack_expect_find(&tuple);
if (!exp) {
write_unlock_bh(&ip_conntrack_lock);
err = -ENOENT;
if (nlh->nlmsg_flags & NLM_F_CREATE)
err = ctnetlink_create_expect(cda);
return err;
}
err = -EEXIST;
if (!(nlh->nlmsg_flags & NLM_F_EXCL))
err = ctnetlink_change_expect(exp, cda);
write_unlock_bh(&ip_conntrack_lock);
DEBUGP("leaving\n");
return err;
}
#ifdef CONFIG_IP_NF_CONNTRACK_EVENTS
static struct notifier_block ctnl_notifier = {
.notifier_call = ctnetlink_conntrack_event,
};
static struct notifier_block ctnl_notifier_exp = {
.notifier_call = ctnetlink_expect_event,
};
#endif
static struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
[IPCTNL_MSG_CT_NEW] = { .call = ctnetlink_new_conntrack,
.cap_required = CAP_NET_ADMIN },
[IPCTNL_MSG_CT_GET] = { .call = ctnetlink_get_conntrack,
.cap_required = CAP_NET_ADMIN },
[IPCTNL_MSG_CT_DELETE] = { .call = ctnetlink_del_conntrack,
.cap_required = CAP_NET_ADMIN },
[IPCTNL_MSG_CT_GET_CTRZERO] = { .call = ctnetlink_get_conntrack,
.cap_required = CAP_NET_ADMIN },
};
static struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_MAX] = {
[IPCTNL_MSG_EXP_GET] = { .call = ctnetlink_get_expect,
.cap_required = CAP_NET_ADMIN },
[IPCTNL_MSG_EXP_NEW] = { .call = ctnetlink_new_expect,
.cap_required = CAP_NET_ADMIN },
[IPCTNL_MSG_EXP_DELETE] = { .call = ctnetlink_del_expect,
.cap_required = CAP_NET_ADMIN },
};
static struct nfnetlink_subsystem ctnl_subsys = {
.name = "conntrack",
.subsys_id = NFNL_SUBSYS_CTNETLINK,
.cb_count = IPCTNL_MSG_MAX,
.attr_count = CTA_MAX,
.cb = ctnl_cb,
};
static struct nfnetlink_subsystem ctnl_exp_subsys = {
.name = "conntrack_expect",
.subsys_id = NFNL_SUBSYS_CTNETLINK_EXP,
.cb_count = IPCTNL_MSG_EXP_MAX,
.attr_count = CTA_MAX,
.cb = ctnl_exp_cb,
};
static int __init ctnetlink_init(void)
{
int ret;
printk("ctnetlink v%s: registering with nfnetlink.\n", version);
ret = nfnetlink_subsys_register(&ctnl_subsys);
if (ret < 0) {
printk("ctnetlink_init: cannot register with nfnetlink.\n");
goto err_out;
}
ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
if (ret < 0) {
printk("ctnetlink_init: cannot register exp with nfnetlink.\n");
goto err_unreg_subsys;
}
#ifdef CONFIG_IP_NF_CONNTRACK_EVENTS
ret = ip_conntrack_register_notifier(&ctnl_notifier);
if (ret < 0) {
printk("ctnetlink_init: cannot register notifier.\n");
goto err_unreg_exp_subsys;
}
ret = ip_conntrack_expect_register_notifier(&ctnl_notifier_exp);
if (ret < 0) {
printk("ctnetlink_init: cannot expect register notifier.\n");
goto err_unreg_notifier;
}
#endif
return 0;
#ifdef CONFIG_IP_NF_CONNTRACK_EVENTS
err_unreg_notifier:
ip_conntrack_unregister_notifier(&ctnl_notifier);
err_unreg_exp_subsys:
nfnetlink_subsys_unregister(&ctnl_exp_subsys);
#endif
err_unreg_subsys:
nfnetlink_subsys_unregister(&ctnl_subsys);
err_out:
return ret;
}
static void __exit ctnetlink_exit(void)
{
printk("ctnetlink: unregistering from nfnetlink.\n");
#ifdef CONFIG_IP_NF_CONNTRACK_EVENTS
ip_conntrack_unregister_notifier(&ctnl_notifier_exp);
ip_conntrack_unregister_notifier(&ctnl_notifier);
#endif
nfnetlink_subsys_unregister(&ctnl_exp_subsys);
nfnetlink_subsys_unregister(&ctnl_subsys);
return;
}
module_init(ctnetlink_init);
module_exit(ctnetlink_exit);
net/ipv4/netfilter/ip_conntrack_proto_icmp.c
浏览文件 @ 080774a2
......@@ -109,16 +109,17 @@ static int icmp_packet(struct ip_conntrack *ct,
return NF_ACCEPT;
}
static u_int8_t valid_new[] = {
[ICMP_ECHO] = 1,
[ICMP_TIMESTAMP] = 1,
[ICMP_INFO_REQUEST] = 1,
[ICMP_ADDRESS] = 1
};
/* Called when a new connection for this protocol found. */
static int icmp_new(struct ip_conntrack *conntrack,
const struct sk_buff *skb)
{
static u_int8_t valid_new[]
= { [ICMP_ECHO] = 1,
[ICMP_TIMESTAMP] = 1,
[ICMP_INFO_REQUEST] = 1,
[ICMP_ADDRESS] = 1 };
if (conntrack->tuplehash[0].tuple.dst.u.icmp.type >= sizeof(valid_new)
|| !valid_new[conntrack->tuplehash[0].tuple.dst.u.icmp.type]) {
/* Can't create a new ICMP `conn' with this. */
......@@ -159,11 +160,12 @@ icmp_error_message(struct sk_buff *skb,
return NF_ACCEPT;
}
innerproto = ip_ct_find_proto(inside->ip.protocol);
innerproto = ip_conntrack_proto_find_get(inside->ip.protocol);
dataoff = skb->nh.iph->ihl*4 + sizeof(inside->icmp) + inside->ip.ihl*4;
/* Are they talking about one of our connections? */
if (!ip_ct_get_tuple(&inside->ip, skb, dataoff, &origtuple, innerproto)) {
DEBUGP("icmp_error: ! get_tuple p=%u", inside->ip.protocol);
ip_conntrack_proto_put(innerproto);
return NF_ACCEPT;
}
......@@ -171,8 +173,10 @@ icmp_error_message(struct sk_buff *skb,
been preserved inside the ICMP. */
if (!ip_ct_invert_tuple(&innertuple, &origtuple, innerproto)) {
DEBUGP("icmp_error_track: Can't invert tuple\n");
ip_conntrack_proto_put(innerproto);
return NF_ACCEPT;
}
ip_conntrack_proto_put(innerproto);
*ctinfo = IP_CT_RELATED;
......@@ -266,6 +270,47 @@ icmp_error(struct sk_buff *skb, enum ip_conntrack_info *ctinfo,
return icmp_error_message(skb, ctinfo, hooknum);
}
#if defined(CONFIG_IP_NF_CONNTRACK_NETLINK) || \
defined(CONFIG_IP_NF_CONNTRACK_NETLINK_MODULE)
static int icmp_tuple_to_nfattr(struct sk_buff *skb,
const struct ip_conntrack_tuple *t)
{
NFA_PUT(skb, CTA_PROTO_ICMP_ID, sizeof(u_int16_t),
&t->src.u.icmp.id);
NFA_PUT(skb, CTA_PROTO_ICMP_TYPE, sizeof(u_int8_t),
&t->dst.u.icmp.type);
NFA_PUT(skb, CTA_PROTO_ICMP_CODE, sizeof(u_int8_t),
&t->dst.u.icmp.code);
if (t->dst.u.icmp.type >= sizeof(valid_new)
|| !valid_new[t->dst.u.icmp.type])
return -EINVAL;
return 0;
nfattr_failure:
return -1;
}
static int icmp_nfattr_to_tuple(struct nfattr *tb[],
struct ip_conntrack_tuple *tuple)
{
if (!tb[CTA_PROTO_ICMP_TYPE-1]
|| !tb[CTA_PROTO_ICMP_CODE-1]
|| !tb[CTA_PROTO_ICMP_ID-1])
return -1;
tuple->dst.u.icmp.type =
*(u_int8_t *)NFA_DATA(tb[CTA_PROTO_ICMP_TYPE-1]);
tuple->dst.u.icmp.code =
*(u_int8_t *)NFA_DATA(tb[CTA_PROTO_ICMP_CODE-1]);
tuple->src.u.icmp.id =
*(u_int8_t *)NFA_DATA(tb[CTA_PROTO_ICMP_ID-1]);
return 0;
}
#endif
struct ip_conntrack_protocol ip_conntrack_protocol_icmp =
{
.proto = IPPROTO_ICMP,
......@@ -277,4 +322,9 @@ struct ip_conntrack_protocol ip_conntrack_protocol_icmp =
.packet = icmp_packet,
.new = icmp_new,
.error = icmp_error,
#if defined(CONFIG_IP_NF_CONNTRACK_NETLINK) || \
defined(CONFIG_IP_NF_CONNTRACK_NETLINK_MODULE)
.tuple_to_nfattr = icmp_tuple_to_nfattr,
.nfattr_to_tuple = icmp_nfattr_to_tuple,
#endif
};
net/ipv4/netfilter/ip_conntrack_proto_sctp.c
浏览文件 @ 080774a2
......@@ -505,7 +505,12 @@ static struct ip_conntrack_protocol ip_conntrack_protocol_sctp = {
.packet = sctp_packet,
.new = sctp_new,
.destroy = NULL,
.me = THIS_MODULE
.me = THIS_MODULE,
#if defined(CONFIG_IP_NF_CONNTRACK_NETLINK) || \
defined(CONFIG_IP_NF_CONNTRACK_NETLINK_MODULE)
.tuple_to_nfattr = ip_ct_port_tuple_to_nfattr,
.nfattr_to_tuple = ip_ct_port_nfattr_to_tuple,
#endif
};
#ifdef CONFIG_SYSCTL
......
net/ipv4/netfilter/ip_conntrack_proto_tcp.c
浏览文件 @ 080774a2
......@@ -336,6 +336,23 @@ static int tcp_print_conntrack(struct seq_file *s,
return seq_printf(s, "%s ", tcp_conntrack_names[state]);
}
#if defined(CONFIG_IP_NF_CONNTRACK_NETLINK) || \
defined(CONFIG_IP_NF_CONNTRACK_NETLINK_MODULE)
static int tcp_to_nfattr(struct sk_buff *skb, struct nfattr *nfa,
const struct ip_conntrack *ct)
{
read_lock_bh(&tcp_lock);
NFA_PUT(skb, CTA_PROTOINFO_TCP_STATE, sizeof(u_int8_t),
&ct->proto.tcp.state);
read_unlock_bh(&tcp_lock);
return 0;
nfattr_failure:
return -1;
}
#endif
static unsigned int get_conntrack_index(const struct tcphdr *tcph)
{
if (tcph->rst) return TCP_RST_SET;
......@@ -1100,4 +1117,10 @@ struct ip_conntrack_protocol ip_conntrack_protocol_tcp =
.packet = tcp_packet,
.new = tcp_new,
.error = tcp_error,
#if defined(CONFIG_IP_NF_CONNTRACK_NETLINK) || \
defined(CONFIG_IP_NF_CONNTRACK_NETLINK_MODULE)
.to_nfattr = tcp_to_nfattr,
.tuple_to_nfattr = ip_ct_port_tuple_to_nfattr,
.nfattr_to_tuple = ip_ct_port_nfattr_to_tuple,
#endif
};
net/ipv4/netfilter/ip_conntrack_proto_udp.c
浏览文件 @ 080774a2
......@@ -145,4 +145,9 @@ struct ip_conntrack_protocol ip_conntrack_protocol_udp =
.packet = udp_packet,
.new = udp_new,
.error = udp_error,
#if defined(CONFIG_IP_NF_CONNTRACK_NETLINK) || \
defined(CONFIG_IP_NF_CONNTRACK_NETLINK_MODULE)
.tuple_to_nfattr = ip_ct_port_tuple_to_nfattr,
.nfattr_to_tuple = ip_ct_port_nfattr_to_tuple,
#endif
};
net/ipv4/netfilter/ip_conntrack_standalone.c
浏览文件 @ 080774a2
......@@ -5,7 +5,7 @@
*/
/* (C) 1999-2001 Paul `Rusty' Russell
* (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
* (C) 2002-2005 Netfilter Core Team <coreteam@netfilter.org>
*
* 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
......@@ -147,8 +147,7 @@ static int ct_seq_show(struct seq_file *s, void *v)
if (DIRECTION(hash))
return 0;
proto = ip_ct_find_proto(conntrack->tuplehash[IP_CT_DIR_ORIGINAL]
.tuple.dst.protonum);
proto = __ip_conntrack_proto_find(conntrack->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum);
IP_NF_ASSERT(proto);
if (seq_printf(s, "%-8s %u %ld ",
......@@ -283,7 +282,7 @@ static int exp_seq_show(struct seq_file *s, void *v)
seq_printf(s, "proto=%u ", expect->tuple.dst.protonum);
print_tuple(s, &expect->tuple,
ip_ct_find_proto(expect->tuple.dst.protonum));
__ip_conntrack_proto_find(expect->tuple.dst.protonum));
return seq_putc(s, '\n');
}
......@@ -992,12 +991,16 @@ EXPORT_SYMBOL(ip_conntrack_helper_register);
EXPORT_SYMBOL(ip_conntrack_helper_unregister);
EXPORT_SYMBOL(ip_ct_iterate_cleanup);
EXPORT_SYMBOL(ip_ct_refresh_acct);
EXPORT_SYMBOL(ip_ct_protos);
EXPORT_SYMBOL(ip_ct_find_proto);
EXPORT_SYMBOL(ip_conntrack_expect_alloc);
EXPORT_SYMBOL(ip_conntrack_expect_put);
EXPORT_SYMBOL_GPL(ip_conntrack_expect_find_get);
EXPORT_SYMBOL(ip_conntrack_expect_related);
EXPORT_SYMBOL(ip_conntrack_unexpect_related);
EXPORT_SYMBOL_GPL(ip_conntrack_expect_list);
EXPORT_SYMBOL_GPL(__ip_conntrack_expect_find);
EXPORT_SYMBOL_GPL(__ip_ct_expect_unlink_destroy);
EXPORT_SYMBOL(ip_conntrack_tuple_taken);
EXPORT_SYMBOL(ip_ct_gather_frags);
EXPORT_SYMBOL(ip_conntrack_htable_size);
......@@ -1005,7 +1008,28 @@ EXPORT_SYMBOL(ip_conntrack_lock);
EXPORT_SYMBOL(ip_conntrack_hash);
EXPORT_SYMBOL(ip_conntrack_untracked);
EXPORT_SYMBOL_GPL(ip_conntrack_find_get);
EXPORT_SYMBOL_GPL(ip_conntrack_put);
#ifdef CONFIG_IP_NF_NAT_NEEDED
EXPORT_SYMBOL(ip_conntrack_tcp_update);
#endif
EXPORT_SYMBOL_GPL(ip_conntrack_flush);
EXPORT_SYMBOL_GPL(__ip_conntrack_find);
EXPORT_SYMBOL_GPL(ip_conntrack_alloc);
EXPORT_SYMBOL_GPL(ip_conntrack_free);
EXPORT_SYMBOL_GPL(ip_conntrack_hash_insert);
EXPORT_SYMBOL_GPL(ip_ct_remove_expectations);
EXPORT_SYMBOL_GPL(ip_conntrack_helper_find_get);
EXPORT_SYMBOL_GPL(ip_conntrack_helper_put);
EXPORT_SYMBOL_GPL(__ip_conntrack_helper_find_byname);
EXPORT_SYMBOL_GPL(ip_conntrack_proto_find_get);
EXPORT_SYMBOL_GPL(ip_conntrack_proto_put);
EXPORT_SYMBOL_GPL(__ip_conntrack_proto_find);
#if defined(CONFIG_IP_NF_CONNTRACK_NETLINK) || \
defined(CONFIG_IP_NF_CONNTRACK_NETLINK_MODULE)
EXPORT_SYMBOL_GPL(ip_ct_port_tuple_to_nfattr);
EXPORT_SYMBOL_GPL(ip_ct_port_nfattr_to_tuple);
#endif
net/ipv4/netfilter/ip_nat_core.c
浏览文件 @ 080774a2
......@@ -47,8 +47,39 @@ DEFINE_RWLOCK(ip_nat_lock);
static unsigned int ip_nat_htable_size;
static struct list_head *bysource;
#define MAX_IP_NAT_PROTO 256
struct ip_nat_protocol *ip_nat_protos[MAX_IP_NAT_PROTO];
static inline struct ip_nat_protocol *
__ip_nat_proto_find(u_int8_t protonum)
{
return ip_nat_protos[protonum];
}
struct ip_nat_protocol *
ip_nat_proto_find_get(u_int8_t protonum)
{
struct ip_nat_protocol *p;
/* we need to disable preemption to make sure 'p' doesn't get
* removed until we've grabbed the reference */
preempt_disable();
p = __ip_nat_proto_find(protonum);
if (p) {
if (!try_module_get(p->me))
p = &ip_nat_unknown_protocol;
}
preempt_enable();
return p;
}
void
ip_nat_proto_put(struct ip_nat_protocol *p)
{
module_put(p->me);
}
/* We keep an extra hash for each conntrack, for fast searching. */
static inline unsigned int
......@@ -103,7 +134,8 @@ static int
in_range(const struct ip_conntrack_tuple *tuple,
const struct ip_nat_range *range)
{
struct ip_nat_protocol *proto = ip_nat_find_proto(tuple->dst.protonum);
struct ip_nat_protocol *proto =
__ip_nat_proto_find(tuple->dst.protonum);
/* If we are supposed to map IPs, then we must be in the
range specified, otherwise let this drag us onto a new src IP. */
......@@ -216,8 +248,7 @@ get_unique_tuple(struct ip_conntrack_tuple *tuple,
struct ip_conntrack *conntrack,
enum ip_nat_manip_type maniptype)
{
struct ip_nat_protocol *proto
= ip_nat_find_proto(orig_tuple->dst.protonum);
struct ip_nat_protocol *proto;
/* 1) If this srcip/proto/src-proto-part is currently mapped,
and that same mapping gives a unique tuple within the given
......@@ -242,14 +273,20 @@ get_unique_tuple(struct ip_conntrack_tuple *tuple,
/* 3) The per-protocol part of the manip is made to map into
the range to make a unique tuple. */
proto = ip_nat_proto_find_get(orig_tuple->dst.protonum);
/* Only bother mapping if it's not already in range and unique */
if ((!(range->flags & IP_NAT_RANGE_PROTO_SPECIFIED)
|| proto->in_range(tuple, maniptype, &range->min, &range->max))
&& !ip_nat_used_tuple(tuple, conntrack))
&& !ip_nat_used_tuple(tuple, conntrack)) {
ip_nat_proto_put(proto);
return;
}
/* Last change: get protocol to try to obtain unique tuple. */
proto->unique_tuple(tuple, range, maniptype, conntrack);
ip_nat_proto_put(proto);
}
unsigned int
......@@ -320,6 +357,7 @@ manip_pkt(u_int16_t proto,
enum ip_nat_manip_type maniptype)
{
struct iphdr *iph;
struct ip_nat_protocol *p;
if (!skb_ip_make_writable(pskb, iphdroff + sizeof(*iph)))
return 0;
......@@ -327,9 +365,12 @@ manip_pkt(u_int16_t proto,
iph = (void *)(*pskb)->data + iphdroff;
/* Manipulate protcol part. */
if (!ip_nat_find_proto(proto)->manip_pkt(pskb, iphdroff,
target, maniptype))
p = ip_nat_proto_find_get(proto);
if (!p->manip_pkt(pskb, iphdroff, target, maniptype)) {
ip_nat_proto_put(p);
return 0;
}
ip_nat_proto_put(p);
iph = (void *)(*pskb)->data + iphdroff;
......@@ -425,7 +466,8 @@ int icmp_reply_translation(struct sk_buff **pskb,
if (!ip_ct_get_tuple(&inside->ip, *pskb, (*pskb)->nh.iph->ihl*4 +
sizeof(struct icmphdr) + inside->ip.ihl*4,
&inner, ip_ct_find_proto(inside->ip.protocol)))
&inner,
__ip_conntrack_proto_find(inside->ip.protocol)))
return 0;
/* Change inner back to look like incoming packet. We do the
......@@ -495,6 +537,49 @@ void ip_nat_protocol_unregister(struct ip_nat_protocol *proto)
synchronize_net();
}
#if defined(CONFIG_IP_NF_CONNTRACK_NETLINK) || \
defined(CONFIG_IP_NF_CONNTRACK_NETLINK_MODULE)
int
ip_nat_port_range_to_nfattr(struct sk_buff *skb,
const struct ip_nat_range *range)
{
NFA_PUT(skb, CTA_PROTONAT_PORT_MIN, sizeof(u_int16_t),
&range->min.tcp.port);
NFA_PUT(skb, CTA_PROTONAT_PORT_MAX, sizeof(u_int16_t),
&range->max.tcp.port);
return 0;
nfattr_failure:
return -1;
}
int
ip_nat_port_nfattr_to_range(struct nfattr *tb[], struct ip_nat_range *range)
{
int ret = 0;
/* we have to return whether we actually parsed something or not */
if (tb[CTA_PROTONAT_PORT_MIN-1]) {
ret = 1;
range->min.tcp.port =
*(u_int16_t *)NFA_DATA(tb[CTA_PROTONAT_PORT_MIN-1]);
}
if (!tb[CTA_PROTONAT_PORT_MAX-1]) {
if (ret)
range->max.tcp.port = range->min.tcp.port;
} else {
ret = 1;
range->max.tcp.port =
*(u_int16_t *)NFA_DATA(tb[CTA_PROTONAT_PORT_MAX-1]);
}
return ret;
}
#endif
int __init ip_nat_init(void)
{
size_t i;
......
net/ipv4/netfilter/ip_nat_proto_icmp.c
浏览文件 @ 080774a2
......@@ -107,10 +107,15 @@ icmp_print_range(char *buffer, const struct ip_nat_range *range)
}
struct ip_nat_protocol ip_nat_protocol_icmp
= { "ICMP", IPPROTO_ICMP,
= { "ICMP", IPPROTO_ICMP, THIS_MODULE,
icmp_manip_pkt,
icmp_in_range,
icmp_unique_tuple,
icmp_print,
icmp_print_range
icmp_print_range,
#if defined(CONFIG_IP_NF_CONNTRACK_NETLINK) || \
defined(CONFIG_IP_NF_CONNTRACK_NETLINK_MODULE)
ip_nat_port_range_to_nfattr,
ip_nat_port_nfattr_to_range,
#endif
};
net/ipv4/netfilter/ip_nat_proto_tcp.c
浏览文件 @ 080774a2
......@@ -12,6 +12,7 @@
#include <linux/ip.h>
#include <linux/tcp.h>
#include <linux/if.h>
#include <linux/netfilter/nfnetlink_conntrack.h>
#include <linux/netfilter_ipv4/ip_nat.h>
#include <linux/netfilter_ipv4/ip_nat_rule.h>
#include <linux/netfilter_ipv4/ip_nat_protocol.h>
......@@ -170,10 +171,15 @@ tcp_print_range(char *buffer, const struct ip_nat_range *range)
}
struct ip_nat_protocol ip_nat_protocol_tcp
= { "TCP", IPPROTO_TCP,
= { "TCP", IPPROTO_TCP, THIS_MODULE,
tcp_manip_pkt,
tcp_in_range,
tcp_unique_tuple,
tcp_print,
tcp_print_range
tcp_print_range,
#if defined(CONFIG_IP_NF_CONNTRACK_NETLINK) || \
defined(CONFIG_IP_NF_CONNTRACK_NETLINK_MODULE)
ip_nat_port_range_to_nfattr,
ip_nat_port_nfattr_to_range,
#endif
};
net/ipv4/netfilter/ip_nat_proto_udp.c
浏览文件 @ 080774a2
......@@ -157,10 +157,15 @@ udp_print_range(char *buffer, const struct ip_nat_range *range)
}
struct ip_nat_protocol ip_nat_protocol_udp
= { "UDP", IPPROTO_UDP,
= { "UDP", IPPROTO_UDP, THIS_MODULE,
udp_manip_pkt,
udp_in_range,
udp_unique_tuple,
udp_print,
udp_print_range
udp_print_range,
#if defined(CONFIG_IP_NF_CONNTRACK_NETLINK) || \
defined(CONFIG_IP_NF_CONNTRACK_NETLINK_MODULE)
ip_nat_port_range_to_nfattr,
ip_nat_port_nfattr_to_range,
#endif
};
net/ipv4/netfilter/ip_nat_proto_unknown.c
浏览文件 @ 080774a2
......@@ -61,7 +61,7 @@ unknown_print_range(char *buffer, const struct ip_nat_range *range)
}
struct ip_nat_protocol ip_nat_unknown_protocol = {
"unknown", 0,
"unknown", 0, THIS_MODULE,
unknown_manip_pkt,
unknown_in_range,
unknown_unique_tuple,
......
net/ipv4/netfilter/ip_nat_standalone.c
浏览文件 @ 080774a2
......@@ -394,6 +394,8 @@ module_exit(fini);
EXPORT_SYMBOL(ip_nat_setup_info);
EXPORT_SYMBOL(ip_nat_protocol_register);
EXPORT_SYMBOL(ip_nat_protocol_unregister);
EXPORT_SYMBOL_GPL(ip_nat_proto_find_get);
EXPORT_SYMBOL_GPL(ip_nat_proto_put);
EXPORT_SYMBOL(ip_nat_cheat_check);
EXPORT_SYMBOL(ip_nat_mangle_tcp_packet);
EXPORT_SYMBOL(ip_nat_mangle_udp_packet);
......
net/netfilter/nfnetlink.c
浏览文件 @ 080774a2
......@@ -121,6 +121,7 @@ void __nfa_fill(struct sk_buff *skb, int attrtype, int attrlen,
nfa->nfa_type = attrtype;
nfa->nfa_len = size;
memcpy(NFA_DATA(nfa), data, attrlen);
memset(NFA_DATA(nfa) + attrlen, 0, NFA_ALIGN(size) - size);
}
int nfattr_parse(struct nfattr *tb[], int maxattr, struct nfattr *nfa, int len)
......
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