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Commit c1d10adb authored by Pablo Neira Ayuso's avatar Pablo Neira Ayuso Committed by David S. Miller
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[NETFILTER]: Add ctnetlink port for nf_conntrack 

Signed-off-by: default avatarPablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: default avatarPatrick McHardy <kaber@trash.net>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 205d67c7
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Inline Side-by-side
Showing with 2289 additions and 63 deletions
include/linux/netfilter/nfnetlink_conntrack.h
View file @ c1d10adb
......@@ -64,6 +64,9 @@ enum ctattr_l4proto {
CTA_PROTO_ICMP_ID,
CTA_PROTO_ICMP_TYPE,
CTA_PROTO_ICMP_CODE,
CTA_PROTO_ICMPV6_ID,
CTA_PROTO_ICMPV6_TYPE,
CTA_PROTO_ICMPV6_CODE,
__CTA_PROTO_MAX
};
#define CTA_PROTO_MAX (__CTA_PROTO_MAX - 1)
......
include/net/netfilter/nf_conntrack.h
View file @ c1d10adb
......@@ -94,6 +94,9 @@ struct nf_conn
/* Current number of expected connections */
unsigned int expecting;
/* Unique ID that identifies this conntrack*/
unsigned int id;
/* Helper. if any */
struct nf_conntrack_helper *helper;
......@@ -140,6 +143,9 @@ struct nf_conntrack_expect
/* Usage count. */
atomic_t use;
/* Unique ID */
unsigned int id;
/* Flags */
unsigned int flags;
......@@ -190,6 +196,31 @@ static inline void nf_ct_put(struct nf_conn *ct)
nf_conntrack_put(&ct->ct_general);
}
extern struct nf_conntrack_tuple_hash *
__nf_conntrack_find(const struct nf_conntrack_tuple *tuple,
const struct nf_conn *ignored_conntrack);
extern void nf_conntrack_hash_insert(struct nf_conn *ct);
extern struct nf_conntrack_expect *
__nf_conntrack_expect_find(const struct nf_conntrack_tuple *tuple);
extern struct nf_conntrack_expect *
nf_conntrack_expect_find(const struct nf_conntrack_tuple *tuple);
extern void nf_ct_unlink_expect(struct nf_conntrack_expect *exp);
extern void nf_ct_remove_expectations(struct nf_conn *ct);
extern void nf_conntrack_flush(void);
extern struct nf_conntrack_helper *
nf_ct_helper_find_get( const struct nf_conntrack_tuple *tuple);
extern void nf_ct_helper_put(struct nf_conntrack_helper *helper);
extern struct nf_conntrack_helper *
__nf_conntrack_helper_find_byname(const char *name);
/* call to create an explicit dependency on nf_conntrack. */
extern void need_nf_conntrack(void);
......
include/net/netfilter/nf_conntrack_helper.h
View file @ c1d10adb
......@@ -33,6 +33,8 @@ struct nf_conntrack_helper
unsigned int protoff,
struct nf_conn *ct,
enum ip_conntrack_info conntrackinfo);
int (*to_nfattr)(struct sk_buff *skb, const struct nf_conn *ct);
};
extern int nf_conntrack_helper_register(struct nf_conntrack_helper *);
......
include/net/netfilter/nf_conntrack_l3proto.h
View file @ c1d10adb
......@@ -14,6 +14,8 @@
#include <linux/seq_file.h>
#include <net/netfilter/nf_conntrack.h>
struct nfattr;
struct nf_conntrack_l3proto
{
/* Next pointer. */
......@@ -70,6 +72,12 @@ struct nf_conntrack_l3proto
u_int32_t (*get_features)(const struct nf_conntrack_tuple *tuple);
int (*tuple_to_nfattr)(struct sk_buff *skb,
const struct nf_conntrack_tuple *t);
int (*nfattr_to_tuple)(struct nfattr *tb[],
struct nf_conntrack_tuple *t);
/* Module (if any) which this is connected to. */
struct module *me;
};
......@@ -81,11 +89,16 @@ extern int nf_conntrack_l3proto_register(struct nf_conntrack_l3proto *proto);
extern void nf_conntrack_l3proto_unregister(struct nf_conntrack_l3proto *proto);
static inline struct nf_conntrack_l3proto *
nf_ct_find_l3proto(u_int16_t l3proto)
__nf_ct_l3proto_find(u_int16_t l3proto)
{
return nf_ct_l3protos[l3proto];
}
extern struct nf_conntrack_l3proto *
nf_ct_l3proto_find_get(u_int16_t l3proto);
extern void nf_ct_l3proto_put(struct nf_conntrack_l3proto *p);
/* Existing built-in protocols */
extern struct nf_conntrack_l3proto nf_conntrack_l3proto_ipv4;
extern struct nf_conntrack_l3proto nf_conntrack_l3proto_ipv6;
......
include/net/netfilter/nf_conntrack_protocol.h
View file @ c1d10adb
......@@ -12,6 +12,7 @@
#include <net/netfilter/nf_conntrack.h>
struct seq_file;
struct nfattr;
struct nf_conntrack_protocol
{
......@@ -66,6 +67,18 @@ struct nf_conntrack_protocol
enum ip_conntrack_info *ctinfo,
int pf, unsigned int hooknum);
/* convert protoinfo to nfnetink attributes */
int (*to_nfattr)(struct sk_buff *skb, struct nfattr *nfa,
const struct nf_conn *ct);
/* convert nfnetlink attributes to protoinfo */
int (*from_nfattr)(struct nfattr *tb[], struct nf_conn *ct);
int (*tuple_to_nfattr)(struct sk_buff *skb,
const struct nf_conntrack_tuple *t);
int (*nfattr_to_tuple)(struct nfattr *tb[],
struct nf_conntrack_tuple *t);
/* Module (if any) which this is connected to. */
struct module *me;
};
......@@ -80,12 +93,23 @@ extern struct nf_conntrack_protocol nf_conntrack_generic_protocol;
extern struct nf_conntrack_protocol **nf_ct_protos[PF_MAX];
extern struct nf_conntrack_protocol *
nf_ct_find_proto(u_int16_t l3proto, u_int8_t protocol);
__nf_ct_proto_find(u_int16_t l3proto, u_int8_t protocol);
extern struct nf_conntrack_protocol *
nf_ct_proto_find_get(u_int16_t l3proto, u_int8_t protocol);
extern void nf_ct_proto_put(struct nf_conntrack_protocol *p);
/* Protocol registration. */
extern int nf_conntrack_protocol_register(struct nf_conntrack_protocol *proto);
extern void nf_conntrack_protocol_unregister(struct nf_conntrack_protocol *proto);
/* Generic netlink helpers */
extern int nf_ct_port_tuple_to_nfattr(struct sk_buff *skb,
const struct nf_conntrack_tuple *tuple);
extern int nf_ct_port_nfattr_to_tuple(struct nfattr *tb[],
struct nf_conntrack_tuple *t);
/* Log invalid packets */
extern unsigned int nf_ct_log_invalid;
......
net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c
View file @ c1d10adb
......@@ -392,6 +392,48 @@ getorigdst(struct sock *sk, int optval, void __user *user, int *len)
return -ENOENT;
}
#if defined(CONFIG_NF_CT_NETLINK) || \
defined(CONFIG_NF_CT_NETLINK_MODULE)
#include <linux/netfilter/nfnetlink.h>
#include <linux/netfilter/nfnetlink_conntrack.h>
static int ipv4_tuple_to_nfattr(struct sk_buff *skb,
const struct nf_conntrack_tuple *tuple)
{
NFA_PUT(skb, CTA_IP_V4_SRC, sizeof(u_int32_t),
&tuple->src.u3.ip);
NFA_PUT(skb, CTA_IP_V4_DST, sizeof(u_int32_t),
&tuple->dst.u3.ip);
return 0;
nfattr_failure:
return -1;
}
static const size_t 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 int ipv4_nfattr_to_tuple(struct nfattr *tb[],
struct nf_conntrack_tuple *t)
{
if (!tb[CTA_IP_V4_SRC-1] || !tb[CTA_IP_V4_DST-1])
return -EINVAL;
if (nfattr_bad_size(tb, CTA_IP_MAX, cta_min_ip))
return -EINVAL;
t->src.u3.ip =
*(u_int32_t *)NFA_DATA(tb[CTA_IP_V4_SRC-1]);
t->dst.u3.ip =
*(u_int32_t *)NFA_DATA(tb[CTA_IP_V4_DST-1]);
return 0;
}
#endif
static struct nf_sockopt_ops so_getorigdst = {
.pf = PF_INET,
.get_optmin = SO_ORIGINAL_DST,
......@@ -408,6 +450,11 @@ struct nf_conntrack_l3proto nf_conntrack_l3proto_ipv4 = {
.print_conntrack = ipv4_print_conntrack,
.prepare = ipv4_prepare,
.get_features = ipv4_get_features,
#if defined(CONFIG_NF_CT_NETLINK) || \
defined(CONFIG_NF_CT_NETLINK_MODULE)
.tuple_to_nfattr = ipv4_tuple_to_nfattr,
.nfattr_to_tuple = ipv4_nfattr_to_tuple,
#endif
.me = THIS_MODULE,
};
......
net/ipv4/netfilter/nf_conntrack_proto_icmp.c
View file @ c1d10adb
......@@ -50,20 +50,21 @@ static int icmp_pkt_to_tuple(const struct sk_buff *skb,
return 1;
}
/* Add 1; spaces filled with 0. */
static const u_int8_t invmap[] = {
[ICMP_ECHO] = ICMP_ECHOREPLY + 1,
[ICMP_ECHOREPLY] = ICMP_ECHO + 1,
[ICMP_TIMESTAMP] = ICMP_TIMESTAMPREPLY + 1,
[ICMP_TIMESTAMPREPLY] = ICMP_TIMESTAMP + 1,
[ICMP_INFO_REQUEST] = ICMP_INFO_REPLY + 1,
[ICMP_INFO_REPLY] = ICMP_INFO_REQUEST + 1,
[ICMP_ADDRESS] = ICMP_ADDRESSREPLY + 1,
[ICMP_ADDRESSREPLY] = ICMP_ADDRESS + 1
};
static int icmp_invert_tuple(struct nf_conntrack_tuple *tuple,
const struct nf_conntrack_tuple *orig)
{
/* Add 1; spaces filled with 0. */
static u_int8_t invmap[]
= { [ICMP_ECHO] = ICMP_ECHOREPLY + 1,
[ICMP_ECHOREPLY] = ICMP_ECHO + 1,
[ICMP_TIMESTAMP] = ICMP_TIMESTAMPREPLY + 1,
[ICMP_TIMESTAMPREPLY] = ICMP_TIMESTAMP + 1,
[ICMP_INFO_REQUEST] = ICMP_INFO_REPLY + 1,
[ICMP_INFO_REPLY] = ICMP_INFO_REQUEST + 1,
[ICMP_ADDRESS] = ICMP_ADDRESSREPLY + 1,
[ICMP_ADDRESSREPLY] = ICMP_ADDRESS + 1};
if (orig->dst.u.icmp.type >= sizeof(invmap)
|| !invmap[orig->dst.u.icmp.type])
return 0;
......@@ -120,11 +121,12 @@ static int icmp_packet(struct nf_conn *ct,
static int icmp_new(struct nf_conn *conntrack,
const struct sk_buff *skb, unsigned int dataoff)
{
static u_int8_t valid_new[]
= { [ICMP_ECHO] = 1,
[ICMP_TIMESTAMP] = 1,
[ICMP_INFO_REQUEST] = 1,
[ICMP_ADDRESS] = 1 };
static const 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]) {
......@@ -168,7 +170,7 @@ icmp_error_message(struct sk_buff *skb,
return -NF_ACCEPT;
}
innerproto = nf_ct_find_proto(PF_INET, inside->ip.protocol);
innerproto = __nf_ct_proto_find(PF_INET, inside->ip.protocol);
dataoff = skb->nh.iph->ihl*4 + sizeof(inside->icmp);
/* Are they talking about one of our connections? */
if (!nf_ct_get_tuple(skb, dataoff, dataoff + inside->ip.ihl*4, PF_INET,
......@@ -281,6 +283,60 @@ icmp_error(struct sk_buff *skb, unsigned int dataoff,
return icmp_error_message(skb, ctinfo, hooknum);
}
#if defined(CONFIG_NF_CT_NETLINK) || \
defined(CONFIG_NF_CT_NETLINK_MODULE)
#include <linux/netfilter/nfnetlink.h>
#include <linux/netfilter/nfnetlink_conntrack.h>
static int icmp_tuple_to_nfattr(struct sk_buff *skb,
const struct nf_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);
return 0;
nfattr_failure:
return -1;
}
static const size_t cta_min_proto[CTA_PROTO_MAX] = {
[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 int icmp_nfattr_to_tuple(struct nfattr *tb[],
struct nf_conntrack_tuple *tuple)
{
if (!tb[CTA_PROTO_ICMP_TYPE-1]
|| !tb[CTA_PROTO_ICMP_CODE-1]
|| !tb[CTA_PROTO_ICMP_ID-1])
return -EINVAL;
if (nfattr_bad_size(tb, CTA_PROTO_MAX, cta_min_proto))
return -EINVAL;
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_int16_t *)NFA_DATA(tb[CTA_PROTO_ICMP_ID-1]);
if (tuple->dst.u.icmp.type >= sizeof(invmap)
|| !invmap[tuple->dst.u.icmp.type])
return -EINVAL;
return 0;
}
#endif
struct nf_conntrack_protocol nf_conntrack_protocol_icmp =
{
.list = { NULL, NULL },
......@@ -295,7 +351,12 @@ struct nf_conntrack_protocol nf_conntrack_protocol_icmp =
.new = icmp_new,
.error = icmp_error,
.destroy = NULL,
.me = NULL
.me = NULL,
#if defined(CONFIG_NF_CT_NETLINK) || \
defined(CONFIG_NF_CT_NETLINK_MODULE)
.tuple_to_nfattr = icmp_tuple_to_nfattr,
.nfattr_to_tuple = icmp_nfattr_to_tuple,
#endif
};
EXPORT_SYMBOL(nf_conntrack_protocol_icmp);
net/ipv6/netfilter/nf_conntrack_l3proto_ipv6.c
View file @ c1d10adb
......@@ -401,6 +401,48 @@ static ctl_table nf_ct_net_table[] = {
};
#endif
#if defined(CONFIG_NF_CT_NETLINK) || \
defined(CONFIG_NF_CT_NETLINK_MODULE)
#include <linux/netfilter/nfnetlink.h>
#include <linux/netfilter/nfnetlink_conntrack.h>
static int ipv6_tuple_to_nfattr(struct sk_buff *skb,
const struct nf_conntrack_tuple *tuple)
{
NFA_PUT(skb, CTA_IP_V6_SRC, sizeof(u_int32_t) * 4,
&tuple->src.u3.ip6);
NFA_PUT(skb, CTA_IP_V6_DST, sizeof(u_int32_t) * 4,
&tuple->dst.u3.ip6);
return 0;
nfattr_failure:
return -1;
}
static const size_t cta_min_ip[CTA_IP_MAX] = {
[CTA_IP_V6_SRC-1] = sizeof(u_int32_t)*4,
[CTA_IP_V6_DST-1] = sizeof(u_int32_t)*4,
};
static int ipv6_nfattr_to_tuple(struct nfattr *tb[],
struct nf_conntrack_tuple *t)
{
if (!tb[CTA_IP_V6_SRC-1] || !tb[CTA_IP_V6_DST-1])
return -EINVAL;
if (nfattr_bad_size(tb, CTA_IP_MAX, cta_min_ip))
return -EINVAL;
memcpy(&t->src.u3.ip6, NFA_DATA(tb[CTA_IP_V6_SRC-1]),
sizeof(u_int32_t) * 4);
memcpy(&t->dst.u3.ip6, NFA_DATA(tb[CTA_IP_V6_DST-1]),
sizeof(u_int32_t) * 4);
return 0;
}
#endif
struct nf_conntrack_l3proto nf_conntrack_l3proto_ipv6 = {
.l3proto = PF_INET6,
.name = "ipv6",
......@@ -409,6 +451,11 @@ struct nf_conntrack_l3proto nf_conntrack_l3proto_ipv6 = {
.print_tuple = ipv6_print_tuple,
.print_conntrack = ipv6_print_conntrack,
.prepare = ipv6_prepare,
#if defined(CONFIG_NF_CT_NETLINK) || \
defined(CONFIG_NF_CT_NETLINK_MODULE)
.tuple_to_nfattr = ipv6_tuple_to_nfattr,
.nfattr_to_tuple = ipv6_nfattr_to_tuple,
#endif
.get_features = ipv6_get_features,
.me = THIS_MODULE,
};
......
net/ipv6/netfilter/nf_conntrack_proto_icmpv6.c
View file @ c1d10adb
......@@ -57,17 +57,17 @@ static int icmpv6_pkt_to_tuple(const struct sk_buff *skb,
return 1;
}
/* Add 1; spaces filled with 0. */
static u_int8_t invmap[] = {
[ICMPV6_ECHO_REQUEST - 128] = ICMPV6_ECHO_REPLY + 1,
[ICMPV6_ECHO_REPLY - 128] = ICMPV6_ECHO_REQUEST + 1,
[ICMPV6_NI_QUERY - 128] = ICMPV6_NI_QUERY + 1,
[ICMPV6_NI_REPLY - 128] = ICMPV6_NI_REPLY +1
};
static int icmpv6_invert_tuple(struct nf_conntrack_tuple *tuple,
const struct nf_conntrack_tuple *orig)
{
/* Add 1; spaces filled with 0. */
static u_int8_t invmap[] = {
[ICMPV6_ECHO_REQUEST - 128] = ICMPV6_ECHO_REPLY + 1,
[ICMPV6_ECHO_REPLY - 128] = ICMPV6_ECHO_REQUEST + 1,
[ICMPV6_NI_QUERY - 128] = ICMPV6_NI_QUERY + 1,
[ICMPV6_NI_REPLY - 128] = ICMPV6_NI_REPLY +1
};
int type = orig->dst.u.icmp.type - 128;
if (type < 0 || type >= sizeof(invmap) || !invmap[type])
return 0;
......@@ -185,7 +185,7 @@ icmpv6_error_message(struct sk_buff *skb,
return -NF_ACCEPT;
}
inproto = nf_ct_find_proto(PF_INET6, inprotonum);
inproto = __nf_ct_proto_find(PF_INET6, inprotonum);
/* Are they talking about one of our connections? */
if (!nf_ct_get_tuple(skb, inip6off, inprotoff, PF_INET6, inprotonum,
......@@ -255,6 +255,60 @@ icmpv6_error(struct sk_buff *skb, unsigned int dataoff,
return icmpv6_error_message(skb, dataoff, ctinfo, hooknum);
}
#if defined(CONFIG_NF_CT_NETLINK) || \
defined(CONFIG_NF_CT_NETLINK_MODULE)
#include <linux/netfilter/nfnetlink.h>
#include <linux/netfilter/nfnetlink_conntrack.h>
static int icmpv6_tuple_to_nfattr(struct sk_buff *skb,
const struct nf_conntrack_tuple *t)
{
NFA_PUT(skb, CTA_PROTO_ICMPV6_ID, sizeof(u_int16_t),
&t->src.u.icmp.id);
NFA_PUT(skb, CTA_PROTO_ICMPV6_TYPE, sizeof(u_int8_t),
&t->dst.u.icmp.type);
NFA_PUT(skb, CTA_PROTO_ICMPV6_CODE, sizeof(u_int8_t),
&t->dst.u.icmp.code);
return 0;
nfattr_failure:
return -1;
}
static const size_t cta_min_proto[CTA_PROTO_MAX] = {
[CTA_PROTO_ICMPV6_TYPE-1] = sizeof(u_int8_t),
[CTA_PROTO_ICMPV6_CODE-1] = sizeof(u_int8_t),
[CTA_PROTO_ICMPV6_ID-1] = sizeof(u_int16_t)
};
static int icmpv6_nfattr_to_tuple(struct nfattr *tb[],
struct nf_conntrack_tuple *tuple)
{
if (!tb[CTA_PROTO_ICMPV6_TYPE-1]
|| !tb[CTA_PROTO_ICMPV6_CODE-1]
|| !tb[CTA_PROTO_ICMPV6_ID-1])
return -EINVAL;
if (nfattr_bad_size(tb, CTA_PROTO_MAX, cta_min_proto))
return -EINVAL;
tuple->dst.u.icmp.type =
*(u_int8_t *)NFA_DATA(tb[CTA_PROTO_ICMPV6_TYPE-1]);
tuple->dst.u.icmp.code =
*(u_int8_t *)NFA_DATA(tb[CTA_PROTO_ICMPV6_CODE-1]);
tuple->src.u.icmp.id =
*(u_int16_t *)NFA_DATA(tb[CTA_PROTO_ICMPV6_ID-1]);
if (tuple->dst.u.icmp.type < 128
|| tuple->dst.u.icmp.type - 128 >= sizeof(invmap)
|| !invmap[tuple->dst.u.icmp.type - 128])
return -EINVAL;
return 0;
}
#endif
struct nf_conntrack_protocol nf_conntrack_protocol_icmpv6 =
{
.l3proto = PF_INET6,
......@@ -267,6 +321,11 @@ struct nf_conntrack_protocol nf_conntrack_protocol_icmpv6 =
.packet = icmpv6_packet,
.new = icmpv6_new,
.error = icmpv6_error,
#if defined(CONFIG_NF_CT_NETLINK) || \
defined(CONFIG_NF_CT_NETLINK_MODULE)
.tuple_to_nfattr = icmpv6_tuple_to_nfattr,
.nfattr_to_tuple = icmpv6_nfattr_to_tuple,
#endif
};
EXPORT_SYMBOL(nf_conntrack_protocol_icmpv6);
net/netfilter/Kconfig
View file @ c1d10adb
......@@ -95,4 +95,11 @@ config NF_CONNTRACK_FTP
To compile it as a module, choose M here. If unsure, say N.
config NF_CT_NETLINK
tristate 'Connection tracking netlink interface (EXPERIMENTAL)'
depends on EXPERIMENTAL && NF_CONNTRACK && NETFILTER_NETLINK
depends on NF_CONNTRACK!=y || NETFILTER_NETLINK!=m
help
This option enables support for a netlink-based userspace interface
endmenu
net/netfilter/Makefile
View file @ c1d10adb
......@@ -13,3 +13,6 @@ obj-$(CONFIG_NF_CONNTRACK_FTP) += nf_conntrack_ftp.o
# SCTP protocol connection tracking
obj-$(CONFIG_NF_CT_PROTO_SCTP) += nf_conntrack_proto_sctp.o
# netlink interface for nf_conntrack
obj-$(CONFIG_NF_CT_NETLINK) += nf_conntrack_netlink.o
net/netfilter/nf_conntrack_core.c
View file @ c1d10adb
......@@ -82,6 +82,8 @@ unsigned int nf_ct_log_invalid;
static LIST_HEAD(unconfirmed);
static int nf_conntrack_vmalloc;
static unsigned int nf_conntrack_next_id = 1;
static unsigned int nf_conntrack_expect_next_id = 1;
#ifdef CONFIG_NF_CONNTRACK_EVENTS
struct notifier_block *nf_conntrack_chain;
struct notifier_block *nf_conntrack_expect_chain;
......@@ -184,7 +186,7 @@ DECLARE_MUTEX(nf_ct_cache_mutex);
extern struct nf_conntrack_protocol nf_conntrack_generic_protocol;
struct nf_conntrack_protocol *
nf_ct_find_proto(u_int16_t l3proto, u_int8_t protocol)
__nf_ct_proto_find(u_int16_t l3proto, u_int8_t protocol)
{
if (unlikely(nf_ct_protos[l3proto] == NULL))
return &nf_conntrack_generic_protocol;
......@@ -192,6 +194,50 @@ nf_ct_find_proto(u_int16_t l3proto, u_int8_t protocol)
return nf_ct_protos[l3proto][protocol];
}
/* this is guaranteed to always return a valid protocol helper, since
* it falls back to generic_protocol */
struct nf_conntrack_protocol *
nf_ct_proto_find_get(u_int16_t l3proto, u_int8_t protocol)
{
struct nf_conntrack_protocol *p;
preempt_disable();
p = __nf_ct_proto_find(l3proto, protocol);
if (p) {
if (!try_module_get(p->me))
p = &nf_conntrack_generic_protocol;
}
preempt_enable();
return p;
}
void nf_ct_proto_put(struct nf_conntrack_protocol *p)
{
module_put(p->me);
}
struct nf_conntrack_l3proto *
nf_ct_l3proto_find_get(u_int16_t l3proto)
{
struct nf_conntrack_l3proto *p;
preempt_disable();
p = __nf_ct_l3proto_find(l3proto);
if (p) {
if (!try_module_get(p->me))
p = &nf_conntrack_generic_l3proto;
}
preempt_enable();
return p;
}
void nf_ct_l3proto_put(struct nf_conntrack_l3proto *p)
{
module_put(p->me);
}
static int nf_conntrack_hash_rnd_initted;
static unsigned int nf_conntrack_hash_rnd;
......@@ -384,7 +430,7 @@ nf_ct_invert_tuple(struct nf_conntrack_tuple *inverse,
}
/* nf_conntrack_expect helper functions */
static void nf_ct_unlink_expect(struct nf_conntrack_expect *exp)
void nf_ct_unlink_expect(struct nf_conntrack_expect *exp)
{
ASSERT_WRITE_LOCK(&nf_conntrack_lock);
NF_CT_ASSERT(!timer_pending(&exp->timeout));
......@@ -404,6 +450,33 @@ static void expectation_timed_out(unsigned long ul_expect)
nf_conntrack_expect_put(exp);
}
struct nf_conntrack_expect *
__nf_conntrack_expect_find(const struct nf_conntrack_tuple *tuple)
{
struct nf_conntrack_expect *i;
list_for_each_entry(i, &nf_conntrack_expect_list, list) {
if (nf_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 nf_conntrack_expect *
nf_conntrack_expect_find(const struct nf_conntrack_tuple *tuple)
{
struct nf_conntrack_expect *i;
read_lock_bh(&nf_conntrack_lock);
i = __nf_conntrack_expect_find(tuple);
read_unlock_bh(&nf_conntrack_lock);
return i;
}
/* If an expectation for this connection is found, it gets delete from
* global list then returned. */
static struct nf_conntrack_expect *
......@@ -432,7 +505,7 @@ find_expectation(const struct nf_conntrack_tuple *tuple)
}
/* delete all expectations for this conntrack */
static void remove_expectations(struct nf_conn *ct)
void nf_ct_remove_expectations(struct nf_conn *ct)
{
struct nf_conntrack_expect *i, *tmp;
......@@ -462,7 +535,7 @@ clean_from_lists(struct nf_conn *ct)
LIST_DELETE(&nf_conntrack_hash[hr], &ct->tuplehash[IP_CT_DIR_REPLY]);
/* Destroy all pending expectations */
remove_expectations(ct);
nf_ct_remove_expectations(ct);
}
static void
......@@ -482,12 +555,11 @@ 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 nf_conntrack_lock!!! -HW */
l3proto = nf_ct_find_l3proto(ct->tuplehash[IP_CT_DIR_REPLY].tuple.src.l3num);
l3proto = __nf_ct_l3proto_find(ct->tuplehash[IP_CT_DIR_REPLY].tuple.src.l3num);
if (l3proto && l3proto->destroy)
l3proto->destroy(ct);
proto = nf_ct_find_proto(ct->tuplehash[IP_CT_DIR_REPLY].tuple.src.l3num,
ct->tuplehash[IP_CT_DIR_REPLY].tuple.dst.protonum);
proto = __nf_ct_proto_find(ct->tuplehash[IP_CT_DIR_REPLY].tuple.src.l3num, ct->tuplehash[IP_CT_DIR_REPLY].tuple.dst.protonum);
if (proto && proto->destroy)
proto->destroy(ct);
......@@ -499,7 +571,7 @@ 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);
nf_ct_remove_expectations(ct);
/* We overload first tuple to link into unconfirmed list. */
if (!nf_ct_is_confirmed(ct)) {
......@@ -540,7 +612,7 @@ conntrack_tuple_cmp(const struct nf_conntrack_tuple_hash *i,
&& nf_ct_tuple_equal(tuple, &i->tuple);
}
static struct nf_conntrack_tuple_hash *
struct nf_conntrack_tuple_hash *
__nf_conntrack_find(const struct nf_conntrack_tuple *tuple,
const struct nf_conn *ignored_conntrack)
{
......@@ -575,6 +647,29 @@ nf_conntrack_find_get(const struct nf_conntrack_tuple *tuple,
return h;
}
static void __nf_conntrack_hash_insert(struct nf_conn *ct,
unsigned int hash,
unsigned int repl_hash)
{
ct->id = ++nf_conntrack_next_id;
list_prepend(&nf_conntrack_hash[hash],
&ct->tuplehash[IP_CT_DIR_ORIGINAL].list);
list_prepend(&nf_conntrack_hash[repl_hash],
&ct->tuplehash[IP_CT_DIR_REPLY].list);
}
void nf_conntrack_hash_insert(struct nf_conn *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(&nf_conntrack_lock);
__nf_conntrack_hash_insert(ct, hash, repl_hash);
write_unlock_bh(&nf_conntrack_lock);
}
/* Confirm a connection given skb; places it in hash table */
int
__nf_conntrack_confirm(struct sk_buff **pskb)
......@@ -621,10 +716,7 @@ __nf_conntrack_confirm(struct sk_buff **pskb)
/* Remove from unconfirmed list */
list_del(&ct->tuplehash[IP_CT_DIR_ORIGINAL].list);
list_prepend(&nf_conntrack_hash[hash],
&ct->tuplehash[IP_CT_DIR_ORIGINAL]);
list_prepend(&nf_conntrack_hash[repl_hash],
&ct->tuplehash[IP_CT_DIR_REPLY]);
__nf_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. */
......@@ -708,13 +800,41 @@ static inline int helper_cmp(const struct nf_conntrack_helper *i,
}
static struct nf_conntrack_helper *
nf_ct_find_helper(const struct nf_conntrack_tuple *tuple)
__nf_ct_helper_find(const struct nf_conntrack_tuple *tuple)
{
return LIST_FIND(&helpers, helper_cmp,
struct nf_conntrack_helper *,
tuple);
}
struct nf_conntrack_helper *
nf_ct_helper_find_get( const struct nf_conntrack_tuple *tuple)
{
struct nf_conntrack_helper *helper;
/* need nf_conntrack_lock to assure that helper exists until
* try_module_get() is called */
read_lock_bh(&nf_conntrack_lock);
helper = __nf_ct_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(&nf_conntrack_lock);
return helper;
}
void nf_ct_helper_put(struct nf_conntrack_helper *helper)
{
module_put(helper->me);
}
static struct nf_conn *
__nf_conntrack_alloc(const struct nf_conntrack_tuple *orig,
const struct nf_conntrack_tuple *repl,
......@@ -744,7 +864,7 @@ __nf_conntrack_alloc(const struct nf_conntrack_tuple *orig,
/* find features needed by this conntrack. */
features = l3proto->get_features(orig);
read_lock_bh(&nf_conntrack_lock);
if (nf_ct_find_helper(repl) != NULL)
if (__nf_ct_helper_find(repl) != NULL)
features |= NF_CT_F_HELP;
read_unlock_bh(&nf_conntrack_lock);
......@@ -794,7 +914,7 @@ struct nf_conn *nf_conntrack_alloc(const struct nf_conntrack_tuple *orig,
{
struct nf_conntrack_l3proto *l3proto;
l3proto = nf_ct_find_l3proto(orig->src.l3num);
l3proto = __nf_ct_l3proto_find(orig->src.l3num);
return __nf_conntrack_alloc(orig, repl, l3proto);
}
......@@ -853,7 +973,7 @@ init_conntrack(const struct nf_conntrack_tuple *tuple,
nf_conntrack_get(&conntrack->master->ct_general);
NF_CT_STAT_INC(expect_new);
} else {
conntrack->helper = nf_ct_find_helper(&repl_tuple);
conntrack->helper = __nf_ct_helper_find(&repl_tuple);
NF_CT_STAT_INC(new);
}
......@@ -947,13 +1067,13 @@ nf_conntrack_in(int pf, unsigned int hooknum, struct sk_buff **pskb)
return NF_ACCEPT;
}
l3proto = nf_ct_find_l3proto((u_int16_t)pf);
l3proto = __nf_ct_l3proto_find((u_int16_t)pf);
if ((ret = l3proto->prepare(pskb, hooknum, &dataoff, &protonum)) <= 0) {
DEBUGP("not prepared to track yet or error occured\n");
return -ret;
}
proto = nf_ct_find_proto((u_int16_t)pf, protonum);
proto = __nf_ct_proto_find((u_int16_t)pf, protonum);
/* It may be an special packet, error, unclean...
* inverse of the return code tells to the netfilter
......@@ -1002,9 +1122,9 @@ int nf_ct_invert_tuplepr(struct nf_conntrack_tuple *inverse,
const struct nf_conntrack_tuple *orig)
{
return nf_ct_invert_tuple(inverse, orig,
nf_ct_find_l3proto(orig->src.l3num),
nf_ct_find_proto(orig->src.l3num,
orig->dst.protonum));
__nf_ct_l3proto_find(orig->src.l3num),
__nf_ct_proto_find(orig->src.l3num,
orig->dst.protonum));
}
/* Would two expected things clash? */
......@@ -1096,6 +1216,7 @@ static void nf_conntrack_expect_insert(struct nf_conntrack_expect *exp)
exp->timeout.expires = jiffies + exp->master->helper->timeout * HZ;
add_timer(&exp->timeout);
exp->id = ++nf_conntrack_expect_next_id;
atomic_inc(&exp->use);
NF_CT_STAT_INC(expect_create);
}
......@@ -1176,7 +1297,7 @@ void nf_conntrack_alter_reply(struct nf_conn *conntrack,
conntrack->tuplehash[IP_CT_DIR_REPLY].tuple = *newreply;
if (!conntrack->master && conntrack->expecting == 0)
conntrack->helper = nf_ct_find_helper(newreply);
conntrack->helper = __nf_ct_helper_find(newreply);
write_unlock_bh(&nf_conntrack_lock);
}
......@@ -1201,6 +1322,19 @@ int nf_conntrack_helper_register(struct nf_conntrack_helper *me)
return 0;
}
struct nf_conntrack_helper *
__nf_conntrack_helper_find_byname(const char *name)
{
struct nf_conntrack_helper *h;
list_for_each_entry(h, &helpers, list) {
if (!strcmp(h->name, name))
return h;
}
return NULL;
}
static inline int unhelp(struct nf_conntrack_tuple_hash *i,
const struct nf_conntrack_helper *me)
{
......@@ -1284,6 +1418,51 @@ void __nf_ct_refresh_acct(struct nf_conn *ct,
nf_conntrack_event_cache(event, skb);
}
#if defined(CONFIG_NF_CT_NETLINK) || \
defined(CONFIG_NF_CT_NETLINK_MODULE)
#include <linux/netfilter/nfnetlink.h>
#include <linux/netfilter/nfnetlink_conntrack.h>
/* 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 nf_ct_port_tuple_to_nfattr(struct sk_buff *skb,
const struct nf_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;
}
static const size_t cta_min_proto[CTA_PROTO_MAX] = {
[CTA_PROTO_SRC_PORT-1] = sizeof(u_int16_t),
[CTA_PROTO_DST_PORT-1] = sizeof(u_int16_t)
};
int nf_ct_port_nfattr_to_tuple(struct nfattr *tb[],
struct nf_conntrack_tuple *t)
{
if (!tb[CTA_PROTO_SRC_PORT-1] || !tb[CTA_PROTO_DST_PORT-1])
return -EINVAL;
if (nfattr_bad_size(tb, CTA_PROTO_MAX, cta_min_proto))
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
/* Used by ipt_REJECT and ip6t_REJECT. */
void __nf_conntrack_attach(struct sk_buff *nskb, struct sk_buff *skb)
{
......@@ -1366,6 +1545,11 @@ static void free_conntrack_hash(struct list_head *hash, int vmalloced, int size)
get_order(sizeof(struct list_head) * size));
}
void nf_conntrack_flush()
{
nf_ct_iterate_cleanup(kill_all, NULL);
}
/* Mishearing the voices in his head, our hero wonders how he's
supposed to kill the mall. */
void nf_conntrack_cleanup(void)
......@@ -1379,7 +1563,7 @@ void nf_conntrack_cleanup(void)
nf_ct_event_cache_flush();
i_see_dead_people:
nf_ct_iterate_cleanup(kill_all, NULL);
nf_conntrack_flush();
if (atomic_read(&nf_conntrack_count) != 0) {
schedule();
goto i_see_dead_people;
......
net/netfilter/nf_conntrack_netlink.c 0 → 100644
View file @ c1d10adb
/* 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.
*
* Derived from ip_conntrack_netlink.c: Port by Pablo Neira Ayuso (05/11/14)
*/
#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/netfilter.h>
#include <net/netfilter/nf_conntrack.h>
#include <net/netfilter/nf_conntrack_core.h>
#include <net/netfilter/nf_conntrack_helper.h>
#include <net/netfilter/nf_conntrack_l3proto.h>
#include <net/netfilter/nf_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[] = "0.92";
#if 0
#define DEBUGP printk
#else
#define DEBUGP(format, args...)
#endif
static inline int
ctnetlink_dump_tuples_proto(struct sk_buff *skb,
const struct nf_conntrack_tuple *tuple)
{
struct nf_conntrack_protocol *proto;
int ret = 0;
NFA_PUT(skb, CTA_PROTO_NUM, sizeof(u_int8_t), &tuple->dst.protonum);
/* If no protocol helper is found, this function will return the
* generic protocol helper, so proto won't *ever* be NULL */
proto = nf_ct_proto_find_get(tuple->src.l3num, tuple->dst.protonum);
if (likely(proto->tuple_to_nfattr))
ret = proto->tuple_to_nfattr(skb, tuple);
nf_ct_proto_put(proto);
return ret;
nfattr_failure:
return -1;
}
static inline int
ctnetlink_dump_tuples(struct sk_buff *skb,
const struct nf_conntrack_tuple *tuple)
{
struct nfattr *nest_parms;
struct nf_conntrack_l3proto *l3proto;
int ret = 0;
l3proto = nf_ct_l3proto_find_get(tuple->src.l3num);
nest_parms = NFA_NEST(skb, CTA_TUPLE_IP);
if (likely(l3proto->tuple_to_nfattr))
ret = l3proto->tuple_to_nfattr(skb, tuple);
NFA_NEST_END(skb, nest_parms);
nf_ct_l3proto_put(l3proto);
if (unlikely(ret < 0))
return ret;
nest_parms = NFA_NEST(skb, CTA_TUPLE_PROTO);
ret = ctnetlink_dump_tuples_proto(skb, tuple);
NFA_NEST_END(skb, nest_parms);
return ret;
nfattr_failure:
return -1;
}
static inline int
ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *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 nf_conn *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 nf_conn *ct)
{
struct nf_conntrack_protocol *proto = nf_ct_proto_find_get(ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num, ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum);
struct nfattr *nest_proto;
int ret;
if (!proto->to_nfattr) {
nf_ct_proto_put(proto);
return 0;
}
nest_proto = NFA_NEST(skb, CTA_PROTOINFO);
ret = proto->to_nfattr(skb, nest_proto, ct);
nf_ct_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 nf_conn *ct)
{
struct nfattr *nest_helper;
if (!ct->helper)
return 0;
nest_helper = NFA_NEST(skb, CTA_HELP);
NFA_PUT(skb, CTA_HELP_NAME, strlen(ct->helper->name), 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_NF_CT_ACCT
static inline int
ctnetlink_dump_counters(struct sk_buff *skb, const struct nf_conn *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_int32_t tmp;
tmp = htonl(ct->counters[dir].packets);
NFA_PUT(skb, CTA_COUNTERS32_PACKETS, sizeof(u_int32_t), &tmp);
tmp = htonl(ct->counters[dir].bytes);
NFA_PUT(skb, CTA_COUNTERS32_BYTES, sizeof(u_int32_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_NF_CONNTRACK_MARK
static inline int
ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *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 nf_conn *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 nf_conn *ct)
{
u_int32_t 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 nf_conn *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 =
ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
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_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 nf_conn *ct = (struct nf_conn *)ptr;
struct sk_buff *skb;
unsigned int type;
unsigned char *b;
unsigned int flags = 0, group;
/* ignore our fake conntrack entry */
if (ct == &nf_conntrack_untracked)
return NOTIFY_DONE;
if (events & IPCT_DESTROY) {
type = IPCTNL_MSG_CT_DELETE;
group = NFNLGRP_CONNTRACK_DESTROY;
} else if (events & (IPCT_NEW | IPCT_RELATED)) {
type = IPCTNL_MSG_CT_NEW;
flags = NLM_F_CREATE|NLM_F_EXCL;
/* dump everything */
events = ~0UL;
group = NFNLGRP_CONNTRACK_NEW;
} else if (events & (IPCT_STATUS |
IPCT_PROTOINFO |
IPCT_HELPER |
IPCT_HELPINFO |
IPCT_NATINFO)) {
type = IPCTNL_MSG_CT_NEW;
group = NFNLGRP_CONNTRACK_UPDATE;
} else
return NOTIFY_DONE;
/* 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 = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
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, group, 0);
return NOTIFY_DONE;
nlmsg_failure:
nfattr_failure:
kfree_skb(skb);
return NOTIFY_DONE;
}
#endif /* CONFIG_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 nf_conn *ct = NULL;
struct nf_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(&nf_conntrack_lock);
for (; cb->args[0] < nf_conntrack_htable_size; cb->args[0]++, *id = 0) {
list_for_each_prev(i, &nf_conntrack_hash[cb->args[0]]) {
h = (struct nf_conntrack_tuple_hash *) i;
if (DIRECTION(h) != IP_CT_DIR_ORIGINAL)
continue;
ct = nf_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(&nf_conntrack_lock);
DEBUGP("leaving, last bucket=%lu id=%u\n", cb->args[0], *id);
return skb->len;
}
#ifdef CONFIG_NF_CT_ACCT
static int
ctnetlink_dump_table_w(struct sk_buff *skb, struct netlink_callback *cb)
{
struct nf_conn *ct = NULL;
struct nf_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(&nf_conntrack_lock);
for (; cb->args[0] < nf_conntrack_htable_size; cb->args[0]++, *id = 0) {
list_for_each_prev(i, &nf_conntrack_hash[cb->args[0]]) {
h = (struct nf_conntrack_tuple_hash *) i;
if (DIRECTION(h) != IP_CT_DIR_ORIGINAL)
continue;
ct = nf_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(&nf_conntrack_lock);
DEBUGP("leaving, last bucket=%lu id=%u\n", cb->args[0], *id);
return skb->len;
}
#endif
static inline int
ctnetlink_parse_tuple_ip(struct nfattr *attr, struct nf_conntrack_tuple *tuple)
{
struct nfattr *tb[CTA_IP_MAX];
struct nf_conntrack_l3proto *l3proto;
int ret = 0;
DEBUGP("entered %s\n", __FUNCTION__);
nfattr_parse_nested(tb, CTA_IP_MAX, attr);
l3proto = nf_ct_l3proto_find_get(tuple->src.l3num);
if (likely(l3proto->nfattr_to_tuple))
ret = l3proto->nfattr_to_tuple(tb, tuple);
nf_ct_l3proto_put(l3proto);
DEBUGP("leaving\n");
return ret;
}
static const size_t cta_min_proto[CTA_PROTO_MAX] = {
[CTA_PROTO_NUM-1] = sizeof(u_int8_t),
};
static inline int
ctnetlink_parse_tuple_proto(struct nfattr *attr,
struct nf_conntrack_tuple *tuple)
{
struct nfattr *tb[CTA_PROTO_MAX];
struct nf_conntrack_protocol *proto;
int ret = 0;
DEBUGP("entered %s\n", __FUNCTION__);
nfattr_parse_nested(tb, CTA_PROTO_MAX, attr);
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_int8_t *)NFA_DATA(tb[CTA_PROTO_NUM-1]);
proto = nf_ct_proto_find_get(tuple->src.l3num, tuple->dst.protonum);
if (likely(proto->nfattr_to_tuple))
ret = proto->nfattr_to_tuple(tb, tuple);
nf_ct_proto_put(proto);
return ret;
}
static inline int
ctnetlink_parse_tuple(struct nfattr *cda[], struct nf_conntrack_tuple *tuple,
enum ctattr_tuple type, u_int8_t l3num)
{
struct nfattr *tb[CTA_TUPLE_MAX];
int err;
DEBUGP("entered %s\n", __FUNCTION__);
memset(tuple, 0, sizeof(*tuple));
nfattr_parse_nested(tb, CTA_TUPLE_MAX, cda[type-1]);
if (!tb[CTA_TUPLE_IP-1])
return -EINVAL;
tuple->src.l3num = l3num;
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;
NF_CT_DUMP_TUPLE(tuple);
DEBUGP("leaving\n");
return 0;
}
#ifdef CONFIG_IP_NF_NAT_NEEDED
static const size_t 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 nf_conn *ct,
struct ip_nat_range *range)
{
struct nfattr *tb[CTA_PROTONAT_MAX];
struct ip_nat_protocol *npt;
DEBUGP("entered %s\n", __FUNCTION__);
nfattr_parse_nested(tb, CTA_PROTONAT_MAX, attr);
if (nfattr_bad_size(tb, CTA_PROTONAT_MAX, cta_min_protonat))
return -EINVAL;
npt = ip_nat_proto_find_get(ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum);
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;
}
static const size_t cta_min_nat[CTA_NAT_MAX] = {
[CTA_NAT_MINIP-1] = sizeof(u_int32_t),
[CTA_NAT_MAXIP-1] = sizeof(u_int32_t),
};
static inline int
ctnetlink_parse_nat(struct nfattr *cda[],
const struct nf_conn *ct, struct ip_nat_range *range)
{
struct nfattr *tb[CTA_NAT_MAX];
int err;
DEBUGP("entered %s\n", __FUNCTION__);
memset(range, 0, sizeof(*range));
nfattr_parse_nested(tb, CTA_NAT_MAX, cda[CTA_NAT-1]);
if (nfattr_bad_size(tb, CTA_NAT_MAX, cta_min_nat))
return -EINVAL;
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;
}
#endif
static inline int
ctnetlink_parse_help(struct nfattr *attr, char **helper_name)
{
struct nfattr *tb[CTA_HELP_MAX];
DEBUGP("entered %s\n", __FUNCTION__);
nfattr_parse_nested(tb, CTA_HELP_MAX, attr);
if (!tb[CTA_HELP_NAME-1])
return -EINVAL;
*helper_name = NFA_DATA(tb[CTA_HELP_NAME-1]);
return 0;
}
static const size_t cta_min[CTA_MAX] = {
[CTA_STATUS-1] = sizeof(u_int32_t),
[CTA_TIMEOUT-1] = sizeof(u_int32_t),
[CTA_MARK-1] = sizeof(u_int32_t),
[CTA_USE-1] = sizeof(u_int32_t),
[CTA_ID-1] = sizeof(u_int32_t)
};
static int
ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb,
struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
{
struct nf_conntrack_tuple_hash *h;
struct nf_conntrack_tuple tuple;
struct nf_conn *ct;
struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
u_int8_t u3 = nfmsg->nfgen_family;
int err = 0;
DEBUGP("entered %s\n", __FUNCTION__);
if (nfattr_bad_size(cda, CTA_MAX, cta_min))
return -EINVAL;
if (cda[CTA_TUPLE_ORIG-1])
err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
else if (cda[CTA_TUPLE_REPLY-1])
err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
else {
/* Flush the whole table */
nf_conntrack_flush();
return 0;
}
if (err < 0)
return err;
h = nf_conntrack_find_get(&tuple, NULL);
if (!h) {
DEBUGP("tuple not found in conntrack hash\n");
return -ENOENT;
}
ct = nf_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) {
nf_ct_put(ct);
return -ENOENT;
}
}
if (del_timer(&ct->timeout))
ct->timeout.function((unsigned long)ct);
nf_ct_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 nf_conntrack_tuple_hash *h;
struct nf_conntrack_tuple tuple;
struct nf_conn *ct;
struct sk_buff *skb2 = NULL;
struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
u_int8_t u3 = nfmsg->nfgen_family;
int err = 0;
DEBUGP("entered %s\n", __FUNCTION__);
if (nlh->nlmsg_flags & NLM_F_DUMP) {
u32 rlen;
if (nfmsg->nfgen_family != AF_INET)
return -EAFNOSUPPORT;
if (NFNL_MSG_TYPE(nlh->nlmsg_type) ==
IPCTNL_MSG_CT_GET_CTRZERO) {
#ifdef CONFIG_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 (nfattr_bad_size(cda, CTA_MAX, cta_min))
return -EINVAL;
if (cda[CTA_TUPLE_ORIG-1])
err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
else if (cda[CTA_TUPLE_REPLY-1])
err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
else
return -EINVAL;
if (err < 0)
return err;
h = nf_conntrack_find_get(&tuple, NULL);
if (!h) {
DEBUGP("tuple not found in conntrack hash");
return -ENOENT;
}
DEBUGP("tuple found\n");
ct = nf_ct_tuplehash_to_ctrack(h);
err = -ENOMEM;
skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
if (!skb2) {
nf_ct_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);
nf_ct_put(ct);
if (err <= 0)
goto free;
err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
if (err < 0)
goto out;
DEBUGP("leaving\n");
return 0;
free:
kfree_skb(skb2);
out:
return err;
}
static inline int
ctnetlink_change_status(struct nf_conn *ct, struct nfattr *cda[])
{
unsigned long d;
unsigned status = ntohl(*(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, HOOK2MANIP(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 nf_conn *ct, struct nfattr *cda[])
{
struct nf_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 = __nf_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 ... */
nf_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 nf_conn *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 inline int
ctnetlink_change_protoinfo(struct nf_conn *ct, struct nfattr *cda[])
{
struct nfattr *tb[CTA_PROTOINFO_MAX], *attr = cda[CTA_PROTOINFO-1];
struct nf_conntrack_protocol *proto;
u_int16_t npt = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum;
u_int16_t l3num = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
int err = 0;
nfattr_parse_nested(tb, CTA_PROTOINFO_MAX, attr);
proto = nf_ct_proto_find_get(l3num, npt);
if (proto->from_nfattr)
err = proto->from_nfattr(tb, ct);
nf_ct_proto_put(proto);
return err;
}
static int
ctnetlink_change_conntrack(struct nf_conn *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;
}
if (cda[CTA_PROTOINFO-1]) {
err = ctnetlink_change_protoinfo(ct, cda);
if (err < 0)
return err;
}
#if defined(CONFIG_IP_NF_CONNTRACK_MARK)
if (cda[CTA_MARK-1])
ct->mark = ntohl(*(u_int32_t *)NFA_DATA(cda[CTA_MARK-1]));
#endif
DEBUGP("all done\n");
return 0;
}
static int
ctnetlink_create_conntrack(struct nfattr *cda[],
struct nf_conntrack_tuple *otuple,
struct nf_conntrack_tuple *rtuple)
{
struct nf_conn *ct;
int err = -EINVAL;
DEBUGP("entered %s\n", __FUNCTION__);
ct = nf_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;
if (cda[CTA_PROTOINFO-1]) {
err = ctnetlink_change_protoinfo(ct, cda);
if (err < 0)
return err;
}
#if defined(CONFIG_IP_NF_CONNTRACK_MARK)
if (cda[CTA_MARK-1])
ct->mark = ntohl(*(u_int32_t *)NFA_DATA(cda[CTA_MARK-1]));
#endif
ct->helper = nf_ct_helper_find_get(rtuple);
add_timer(&ct->timeout);
nf_conntrack_hash_insert(ct);
if (ct->helper)
nf_ct_helper_put(ct->helper);
DEBUGP("conntrack with id %u inserted\n", ct->id);
return 0;
err:
nf_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 nf_conntrack_tuple otuple, rtuple;
struct nf_conntrack_tuple_hash *h = NULL;
struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
u_int8_t u3 = nfmsg->nfgen_family;
int err = 0;
DEBUGP("entered %s\n", __FUNCTION__);
if (nfattr_bad_size(cda, CTA_MAX, cta_min))
return -EINVAL;
if (cda[CTA_TUPLE_ORIG-1]) {
err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG, u3);
if (err < 0)
return err;
}
if (cda[CTA_TUPLE_REPLY-1]) {
err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY, u3);
if (err < 0)
return err;
}
write_lock_bh(&nf_conntrack_lock);
if (cda[CTA_TUPLE_ORIG-1])
h = __nf_conntrack_find(&otuple, NULL);
else if (cda[CTA_TUPLE_REPLY-1])
h = __nf_conntrack_find(&rtuple, NULL);
if (h == NULL) {
write_unlock_bh(&nf_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);
return err;
}
/* implicit '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(nf_ct_tuplehash_to_ctrack(h), cda);
out_unlock:
write_unlock_bh(&nf_conntrack_lock);
return err;
}
/***********************************************************************
* EXPECT
***********************************************************************/
static inline int
ctnetlink_exp_dump_tuple(struct sk_buff *skb,
const struct nf_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 nf_conntrack_expect *exp)
{
struct nf_conn *master = exp->master;
u_int32_t timeout = htonl((exp->timeout.expires - jiffies) / HZ);
u_int32_t id = htonl(exp->id);
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;
if (ctnetlink_exp_dump_tuple(skb,
&master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
CTA_EXPECT_MASTER) < 0)
goto nfattr_failure;
NFA_PUT(skb, CTA_EXPECT_TIMEOUT, sizeof(timeout), &timeout);
NFA_PUT(skb, CTA_EXPECT_ID, sizeof(u_int32_t), &id);
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 nf_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 = exp->tuple.src.l3num;
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_NF_CONNTRACK_EVENTS
static int ctnetlink_expect_event(struct notifier_block *this,
unsigned long events, void *ptr)
{
struct nlmsghdr *nlh;
struct nfgenmsg *nfmsg;
struct nf_conntrack_expect *exp = (struct nf_conntrack_expect *)ptr;
struct sk_buff *skb;
unsigned int type;
unsigned char *b;
int flags = 0;
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 = exp->tuple.src.l3num;
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;
nfnetlink_send(skb, 0, NFNLGRP_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 nf_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(&nf_conntrack_lock);
list_for_each_prev(i, &nf_conntrack_expect_list) {
exp = (struct nf_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(&nf_conntrack_lock);
DEBUGP("leaving, last id=%llu\n", *id);
return skb->len;
}
static const size_t cta_min_exp[CTA_EXPECT_MAX] = {
[CTA_EXPECT_TIMEOUT-1] = sizeof(u_int32_t),
[CTA_EXPECT_ID-1] = sizeof(u_int32_t)
};
static int
ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
{
struct nf_conntrack_tuple tuple;
struct nf_conntrack_expect *exp;
struct sk_buff *skb2;
struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
u_int8_t u3 = nfmsg->nfgen_family;
int err = 0;
DEBUGP("entered %s\n", __FUNCTION__);
if (nfattr_bad_size(cda, CTA_EXPECT_MAX, cta_min_exp))
return -EINVAL;
if (nlh->nlmsg_flags & NLM_F_DUMP) {
u32 rlen;
if (nfmsg->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_EXPECT_MASTER-1])
err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3);
else
return -EINVAL;
if (err < 0)
return err;
exp = nf_conntrack_expect_find(&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)) {
nf_conntrack_expect_put(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 free;
nf_conntrack_expect_put(exp);
return netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
free:
kfree_skb(skb2);
out:
nf_conntrack_expect_put(exp);
return err;
}
static int
ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
{
struct nf_conntrack_expect *exp, *tmp;
struct nf_conntrack_tuple tuple;
struct nf_conntrack_helper *h;
struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
u_int8_t u3 = nfmsg->nfgen_family;
int err;
if (nfattr_bad_size(cda, CTA_EXPECT_MAX, cta_min_exp))
return -EINVAL;
if (cda[CTA_EXPECT_TUPLE-1]) {
/* delete a single expect by tuple */
err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
if (err < 0)
return err;
/* bump usage count to 2 */
exp = nf_conntrack_expect_find(&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)) {
nf_conntrack_expect_put(exp);
return -ENOENT;
}
}
/* after list removal, usage count == 1 */
nf_conntrack_unexpect_related(exp);
/* have to put what we 'get' above.
* after this line usage count == 0 */
nf_conntrack_expect_put(exp);
} else if (cda[CTA_EXPECT_HELP_NAME-1]) {
char *name = NFA_DATA(cda[CTA_EXPECT_HELP_NAME-1]);
/* delete all expectations for this helper */
write_lock_bh(&nf_conntrack_lock);
h = __nf_conntrack_helper_find_byname(name);
if (!h) {
write_unlock_bh(&nf_conntrack_lock);
return -EINVAL;
}
list_for_each_entry_safe(exp, tmp, &nf_conntrack_expect_list,
list) {
if (exp->master->helper == h
&& del_timer(&exp->timeout)) {
nf_ct_unlink_expect(exp);
nf_conntrack_expect_put(exp);
}
}
write_unlock_bh(&nf_conntrack_lock);
} else {
/* This basically means we have to flush everything*/
write_lock_bh(&nf_conntrack_lock);
list_for_each_entry_safe(exp, tmp, &nf_conntrack_expect_list,
list) {
if (del_timer(&exp->timeout)) {
nf_ct_unlink_expect(exp);
nf_conntrack_expect_put(exp);
}
}
write_unlock_bh(&nf_conntrack_lock);
}
return 0;
}
static int
ctnetlink_change_expect(struct nf_conntrack_expect *x, struct nfattr *cda[])
{
return -EOPNOTSUPP;
}
static int
ctnetlink_create_expect(struct nfattr *cda[], u_int8_t u3)
{
struct nf_conntrack_tuple tuple, mask, master_tuple;
struct nf_conntrack_tuple_hash *h = NULL;
struct nf_conntrack_expect *exp;
struct nf_conn *ct;
int err = 0;
DEBUGP("entered %s\n", __FUNCTION__);
/* caller guarantees that those three CTA_EXPECT_* exist */
err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
if (err < 0)
return err;
err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK, u3);
if (err < 0)
return err;
err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER, u3);
if (err < 0)
return err;
/* Look for master conntrack of this expectation */
h = nf_conntrack_find_get(&master_tuple, NULL);
if (!h)
return -ENOENT;
ct = nf_ct_tuplehash_to_ctrack(h);
if (!ct->helper) {
/* such conntrack hasn't got any helper, abort */
err = -EINVAL;
goto out;
}
exp = nf_conntrack_expect_alloc(ct);
if (!exp) {
err = -ENOMEM;
goto out;
}
exp->expectfn = NULL;
exp->flags = 0;
exp->master = ct;
memcpy(&exp->tuple, &tuple, sizeof(struct nf_conntrack_tuple));
memcpy(&exp->mask, &mask, sizeof(struct nf_conntrack_tuple));
err = nf_conntrack_expect_related(exp);
nf_conntrack_expect_put(exp);
out:
nf_ct_put(nf_ct_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 nf_conntrack_tuple tuple;
struct nf_conntrack_expect *exp;
struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
u_int8_t u3 = nfmsg->nfgen_family;
int err = 0;
DEBUGP("entered %s\n", __FUNCTION__);
if (nfattr_bad_size(cda, CTA_EXPECT_MAX, cta_min_exp))
return -EINVAL;
if (!cda[CTA_EXPECT_TUPLE-1]
|| !cda[CTA_EXPECT_MASK-1]
|| !cda[CTA_EXPECT_MASTER-1])
return -EINVAL;
err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
if (err < 0)
return err;
write_lock_bh(&nf_conntrack_lock);
exp = __nf_conntrack_expect_find(&tuple);
if (!exp) {
write_unlock_bh(&nf_conntrack_lock);
err = -ENOENT;
if (nlh->nlmsg_flags & NLM_F_CREATE)
err = ctnetlink_create_expect(cda, u3);
return err;
}
err = -EEXIST;
if (!(nlh->nlmsg_flags & NLM_F_EXCL))
err = ctnetlink_change_expect(exp, cda);
write_unlock_bh(&nf_conntrack_lock);
DEBUGP("leaving\n");
return err;
}
#ifdef CONFIG_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,
.attr_count = CTA_MAX, },
[IPCTNL_MSG_CT_GET] = { .call = ctnetlink_get_conntrack,
.attr_count = CTA_MAX, },
[IPCTNL_MSG_CT_DELETE] = { .call = ctnetlink_del_conntrack,
.attr_count = CTA_MAX, },
[IPCTNL_MSG_CT_GET_CTRZERO] = { .call = ctnetlink_get_conntrack,
.attr_count = CTA_MAX, },
};
static struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
[IPCTNL_MSG_EXP_GET] = { .call = ctnetlink_get_expect,
.attr_count = CTA_EXPECT_MAX, },
[IPCTNL_MSG_EXP_NEW] = { .call = ctnetlink_new_expect,
.attr_count = CTA_EXPECT_MAX, },
[IPCTNL_MSG_EXP_DELETE] = { .call = ctnetlink_del_expect,
.attr_count = CTA_EXPECT_MAX, },
};
static struct nfnetlink_subsystem ctnl_subsys = {
.name = "conntrack",
.subsys_id = NFNL_SUBSYS_CTNETLINK,
.cb_count = IPCTNL_MSG_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,
.cb = ctnl_exp_cb,
};
MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
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_NF_CONNTRACK_EVENTS
ret = nf_conntrack_register_notifier(&ctnl_notifier);
if (ret < 0) {
printk("ctnetlink_init: cannot register notifier.\n");
goto err_unreg_exp_subsys;
}
ret = nf_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_NF_CONNTRACK_EVENTS
err_unreg_notifier:
nf_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_NF_CONNTRACK_EVENTS
nf_conntrack_unregister_notifier(&ctnl_notifier_exp);
nf_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/netfilter/nf_conntrack_proto_tcp.c
View file @ c1d10adb
......@@ -1147,6 +1147,63 @@ static int tcp_new(struct nf_conn *conntrack,
receiver->td_scale);
return 1;
}
#if defined(CONFIG_NF_CT_NETLINK) || \
defined(CONFIG_NF_CT_NETLINK_MODULE)
#include <linux/netfilter/nfnetlink.h>
#include <linux/netfilter/nfnetlink_conntrack.h>
static int tcp_to_nfattr(struct sk_buff *skb, struct nfattr *nfa,
const struct nf_conn *ct)
{
struct nfattr *nest_parms;
read_lock_bh(&tcp_lock);
nest_parms = NFA_NEST(skb, CTA_PROTOINFO_TCP);
NFA_PUT(skb, CTA_PROTOINFO_TCP_STATE, sizeof(u_int8_t),
&ct->proto.tcp.state);
read_unlock_bh(&tcp_lock);
NFA_NEST_END(skb, nest_parms);
return 0;
nfattr_failure:
read_unlock_bh(&tcp_lock);
return -1;
}
static const size_t cta_min_tcp[CTA_PROTOINFO_TCP_MAX] = {
[CTA_PROTOINFO_TCP_STATE-1] = sizeof(u_int8_t),
};
static int nfattr_to_tcp(struct nfattr *cda[], struct nf_conn *ct)
{
struct nfattr *attr = cda[CTA_PROTOINFO_TCP-1];
struct nfattr *tb[CTA_PROTOINFO_TCP_MAX];
/* updates could not contain anything about the private
* protocol info, in that case skip the parsing */
if (!attr)
return 0;
nfattr_parse_nested(tb, CTA_PROTOINFO_TCP_MAX, attr);
if (nfattr_bad_size(tb, CTA_PROTOINFO_TCP_MAX, cta_min_tcp))
return -EINVAL;
if (!tb[CTA_PROTOINFO_TCP_STATE-1])
return -EINVAL;
write_lock_bh(&tcp_lock);
ct->proto.tcp.state =
*(u_int8_t *)NFA_DATA(tb[CTA_PROTOINFO_TCP_STATE-1]);
write_unlock_bh(&tcp_lock);
return 0;
}
#endif
struct nf_conntrack_protocol nf_conntrack_protocol_tcp4 =
{
......@@ -1160,6 +1217,13 @@ struct nf_conntrack_protocol nf_conntrack_protocol_tcp4 =
.packet = tcp_packet,
.new = tcp_new,
.error = tcp_error4,
#if defined(CONFIG_NF_CT_NETLINK) || \
defined(CONFIG_NF_CT_NETLINK_MODULE)
.to_nfattr = tcp_to_nfattr,
.from_nfattr = nfattr_to_tcp,
.tuple_to_nfattr = nf_ct_port_tuple_to_nfattr,
.nfattr_to_tuple = nf_ct_port_nfattr_to_tuple,
#endif
};
struct nf_conntrack_protocol nf_conntrack_protocol_tcp6 =
......@@ -1174,6 +1238,13 @@ struct nf_conntrack_protocol nf_conntrack_protocol_tcp6 =
.packet = tcp_packet,
.new = tcp_new,
.error = tcp_error6,
#if defined(CONFIG_NF_CT_NETLINK) || \
defined(CONFIG_NF_CT_NETLINK_MODULE)
.to_nfattr = tcp_to_nfattr,
.from_nfattr = nfattr_to_tcp,
.tuple_to_nfattr = nf_ct_port_tuple_to_nfattr,
.nfattr_to_tuple = nf_ct_port_nfattr_to_tuple,
#endif
};
EXPORT_SYMBOL(nf_conntrack_protocol_tcp4);
......
net/netfilter/nf_conntrack_proto_udp.c
View file @ c1d10adb
......@@ -196,6 +196,11 @@ struct nf_conntrack_protocol nf_conntrack_protocol_udp4 =
.packet = udp_packet,
.new = udp_new,
.error = udp_error4,
#if defined(CONFIG_NF_CT_NETLINK) || \
defined(CONFIG_NF_CT_NETLINK_MODULE)
.tuple_to_nfattr = nf_ct_port_tuple_to_nfattr,
.nfattr_to_tuple = nf_ct_port_nfattr_to_tuple,
#endif
};
struct nf_conntrack_protocol nf_conntrack_protocol_udp6 =
......@@ -210,6 +215,11 @@ struct nf_conntrack_protocol nf_conntrack_protocol_udp6 =
.packet = udp_packet,
.new = udp_new,
.error = udp_error6,
#if defined(CONFIG_NF_CT_NETLINK) || \
defined(CONFIG_NF_CT_NETLINK_MODULE)
.tuple_to_nfattr = nf_ct_port_tuple_to_nfattr,
.nfattr_to_tuple = nf_ct_port_nfattr_to_tuple,
#endif
};
EXPORT_SYMBOL(nf_conntrack_protocol_udp4);
......
net/netfilter/nf_conntrack_standalone.c
View file @ c1d10adb
......@@ -161,14 +161,14 @@ static int ct_seq_show(struct seq_file *s, void *v)
if (NF_CT_DIRECTION(hash))
return 0;
l3proto = nf_ct_find_l3proto(conntrack->tuplehash[IP_CT_DIR_ORIGINAL]
.tuple.src.l3num);
l3proto = __nf_ct_l3proto_find(conntrack->tuplehash[IP_CT_DIR_ORIGINAL]
.tuple.src.l3num);
NF_CT_ASSERT(l3proto);
proto = nf_ct_find_proto(conntrack->tuplehash[IP_CT_DIR_ORIGINAL]
.tuple.src.l3num,
conntrack->tuplehash[IP_CT_DIR_ORIGINAL]
.tuple.dst.protonum);
proto = __nf_ct_proto_find(conntrack->tuplehash[IP_CT_DIR_ORIGINAL]
.tuple.src.l3num,
conntrack->tuplehash[IP_CT_DIR_ORIGINAL]
.tuple.dst.protonum);
NF_CT_ASSERT(proto);
if (seq_printf(s, "%-8s %u %-8s %u %ld ",
......@@ -307,9 +307,9 @@ static int exp_seq_show(struct seq_file *s, void *v)
expect->tuple.src.l3num,
expect->tuple.dst.protonum);
print_tuple(s, &expect->tuple,
nf_ct_find_l3proto(expect->tuple.src.l3num),
nf_ct_find_proto(expect->tuple.src.l3num,
expect->tuple.dst.protonum));
__nf_ct_l3proto_find(expect->tuple.src.l3num),
__nf_ct_proto_find(expect->tuple.src.l3num,
expect->tuple.dst.protonum));
return seq_putc(s, '\n');
}
......@@ -847,7 +847,11 @@ EXPORT_SYMBOL(nf_conntrack_helper_unregister);
EXPORT_SYMBOL(nf_ct_iterate_cleanup);
EXPORT_SYMBOL(__nf_ct_refresh_acct);
EXPORT_SYMBOL(nf_ct_protos);
EXPORT_SYMBOL(nf_ct_find_proto);
EXPORT_SYMBOL(__nf_ct_proto_find);
EXPORT_SYMBOL(nf_ct_proto_find_get);
EXPORT_SYMBOL(nf_ct_proto_put);
EXPORT_SYMBOL(nf_ct_l3proto_find_get);
EXPORT_SYMBOL(nf_ct_l3proto_put);
EXPORT_SYMBOL(nf_ct_l3protos);
EXPORT_SYMBOL(nf_conntrack_expect_alloc);
EXPORT_SYMBOL(nf_conntrack_expect_put);
......@@ -867,3 +871,21 @@ EXPORT_SYMBOL(nf_ct_get_tuple);
EXPORT_SYMBOL(nf_ct_invert_tuple);
EXPORT_SYMBOL(nf_conntrack_in);
EXPORT_SYMBOL(__nf_conntrack_attach);
EXPORT_SYMBOL(nf_conntrack_alloc);
EXPORT_SYMBOL(nf_conntrack_free);
EXPORT_SYMBOL(nf_conntrack_flush);
EXPORT_SYMBOL(nf_ct_remove_expectations);
EXPORT_SYMBOL(nf_ct_helper_find_get);
EXPORT_SYMBOL(nf_ct_helper_put);
EXPORT_SYMBOL(__nf_conntrack_helper_find_byname);
EXPORT_SYMBOL(__nf_conntrack_find);
EXPORT_SYMBOL(nf_ct_unlink_expect);
EXPORT_SYMBOL(nf_conntrack_hash_insert);
EXPORT_SYMBOL(__nf_conntrack_expect_find);
EXPORT_SYMBOL(nf_conntrack_expect_find);
EXPORT_SYMBOL(nf_conntrack_expect_list);
#if defined(CONFIG_NF_CT_NETLINK) || \
defined(CONFIG_NF_CT_NETLINK_MODULE)
EXPORT_SYMBOL(nf_ct_port_tuple_to_nfattr);
EXPORT_SYMBOL(nf_ct_port_nfattr_to_tuple);
#endif
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