Skip to content

Commit 9fb9cbb

Browse files
yasuyuki5davem330
yasuyuki5
authored and
davem330
committed
[NETFILTER]: Add nf_conntrack subsystem.
The existing connection tracking subsystem in netfilter can only handle ipv4. There were basically two choices present to add connection tracking support for ipv6. We could either duplicate all of the ipv4 connection tracking code into an ipv6 counterpart, or (the choice taken by these patches) we could design a generic layer that could handle both ipv4 and ipv6 and thus requiring only one sub-protocol (TCP, UDP, etc.) connection tracking helper module to be written. In fact nf_conntrack is capable of working with any layer 3 protocol. The existing ipv4 specific conntrack code could also not deal with the pecularities of doing connection tracking on ipv6, which is also cured here. For example, these issues include: 1) ICMPv6 handling, which is used for neighbour discovery in ipv6 thus some messages such as these should not participate in connection tracking since effectively they are like ARP messages 2) fragmentation must be handled differently in ipv6, because the simplistic "defrag, connection track and NAT, refrag" (which the existing ipv4 connection tracking does) approach simply isn't feasible in ipv6 3) ipv6 extension header parsing must occur at the correct spots before and after connection tracking decisions, and there were no provisions for this in the existing connection tracking design 4) ipv6 has no need for stateful NAT The ipv4 specific conntrack layer is kept around, until all of the ipv4 specific conntrack helpers are ported over to nf_conntrack and it is feature complete. Once that occurs, the old conntrack stuff will get placed into the feature-removal-schedule and we will fully kill it off 6 months later. Signed-off-by: Yasuyuki Kozakai <yasuyuki.kozakai@toshiba.co.jp> Signed-off-by: Harald Welte <laforge@netfilter.org> Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
1 parent 6730c3c commit 9fb9cbb

Some content is hidden

Large Commits have some content hidden by default. Use the searchbox below for content that may be hidden.

57 files changed

+9710
-333
lines changed

‎include/linux/netfilter/nf_conntrack_common.h‎

Lines changed: 159 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,159 @@
1+
#ifndef _NF_CONNTRACK_COMMON_H
2+
#define _NF_CONNTRACK_COMMON_H
3+
/* Connection state tracking for netfilter. This is separated from,
4+
but required by, the NAT layer; it can also be used by an iptables
5+
extension. */
6+
enum ip_conntrack_info
7+
{
8+
/* Part of an established connection (either direction). */
9+
IP_CT_ESTABLISHED,
10+
11+
/* Like NEW, but related to an existing connection, or ICMP error
12+
(in either direction). */
13+
IP_CT_RELATED,
14+
15+
/* Started a new connection to track (only
16+
IP_CT_DIR_ORIGINAL); may be a retransmission. */
17+
IP_CT_NEW,
18+
19+
/* >= this indicates reply direction */
20+
IP_CT_IS_REPLY,
21+
22+
/* Number of distinct IP_CT types (no NEW in reply dirn). */
23+
IP_CT_NUMBER = IP_CT_IS_REPLY * 2 - 1
24+
};
25+
26+
/* Bitset representing status of connection. */
27+
enum ip_conntrack_status {
28+
/* It's an expected connection: bit 0 set. This bit never changed */
29+
IPS_EXPECTED_BIT = 0,
30+
IPS_EXPECTED = (1 << IPS_EXPECTED_BIT),
31+
32+
/* We've seen packets both ways: bit 1 set. Can be set, not unset. */
33+
IPS_SEEN_REPLY_BIT = 1,
34+
IPS_SEEN_REPLY = (1 << IPS_SEEN_REPLY_BIT),
35+
36+
/* Conntrack should never be early-expired. */
37+
IPS_ASSURED_BIT = 2,
38+
IPS_ASSURED = (1 << IPS_ASSURED_BIT),
39+
40+
/* Connection is confirmed: originating packet has left box */
41+
IPS_CONFIRMED_BIT = 3,
42+
IPS_CONFIRMED = (1 << IPS_CONFIRMED_BIT),
43+
44+
/* Connection needs src nat in orig dir. This bit never changed. */
45+
IPS_SRC_NAT_BIT = 4,
46+
IPS_SRC_NAT = (1 << IPS_SRC_NAT_BIT),
47+
48+
/* Connection needs dst nat in orig dir. This bit never changed. */
49+
IPS_DST_NAT_BIT = 5,
50+
IPS_DST_NAT = (1 << IPS_DST_NAT_BIT),
51+
52+
/* Both together. */
53+
IPS_NAT_MASK = (IPS_DST_NAT | IPS_SRC_NAT),
54+
55+
/* Connection needs TCP sequence adjusted. */
56+
IPS_SEQ_ADJUST_BIT = 6,
57+
IPS_SEQ_ADJUST = (1 << IPS_SEQ_ADJUST_BIT),
58+
59+
/* NAT initialization bits. */
60+
IPS_SRC_NAT_DONE_BIT = 7,
61+
IPS_SRC_NAT_DONE = (1 << IPS_SRC_NAT_DONE_BIT),
62+
63+
IPS_DST_NAT_DONE_BIT = 8,
64+
IPS_DST_NAT_DONE = (1 << IPS_DST_NAT_DONE_BIT),
65+
66+
/* Both together */
67+
IPS_NAT_DONE_MASK = (IPS_DST_NAT_DONE | IPS_SRC_NAT_DONE),
68+
69+
/* Connection is dying (removed from lists), can not be unset. */
70+
IPS_DYING_BIT = 9,
71+
IPS_DYING = (1 << IPS_DYING_BIT),
72+
};
73+
74+
/* Connection tracking event bits */
75+
enum ip_conntrack_events
76+
{
77+
/* New conntrack */
78+
IPCT_NEW_BIT = 0,
79+
IPCT_NEW = (1 << IPCT_NEW_BIT),
80+
81+
/* Expected connection */
82+
IPCT_RELATED_BIT = 1,
83+
IPCT_RELATED = (1 << IPCT_RELATED_BIT),
84+
85+
/* Destroyed conntrack */
86+
IPCT_DESTROY_BIT = 2,
87+
IPCT_DESTROY = (1 << IPCT_DESTROY_BIT),
88+
89+
/* Timer has been refreshed */
90+
IPCT_REFRESH_BIT = 3,
91+
IPCT_REFRESH = (1 << IPCT_REFRESH_BIT),
92+
93+
/* Status has changed */
94+
IPCT_STATUS_BIT = 4,
95+
IPCT_STATUS = (1 << IPCT_STATUS_BIT),
96+
97+
/* Update of protocol info */
98+
IPCT_PROTOINFO_BIT = 5,
99+
IPCT_PROTOINFO = (1 << IPCT_PROTOINFO_BIT),
100+
101+
/* Volatile protocol info */
102+
IPCT_PROTOINFO_VOLATILE_BIT = 6,
103+
IPCT_PROTOINFO_VOLATILE = (1 << IPCT_PROTOINFO_VOLATILE_BIT),
104+
105+
/* New helper for conntrack */
106+
IPCT_HELPER_BIT = 7,
107+
IPCT_HELPER = (1 << IPCT_HELPER_BIT),
108+
109+
/* Update of helper info */
110+
IPCT_HELPINFO_BIT = 8,
111+
IPCT_HELPINFO = (1 << IPCT_HELPINFO_BIT),
112+
113+
/* Volatile helper info */
114+
IPCT_HELPINFO_VOLATILE_BIT = 9,
115+
IPCT_HELPINFO_VOLATILE = (1 << IPCT_HELPINFO_VOLATILE_BIT),
116+
117+
/* NAT info */
118+
IPCT_NATINFO_BIT = 10,
119+
IPCT_NATINFO = (1 << IPCT_NATINFO_BIT),
120+
121+
/* Counter highest bit has been set */
122+
IPCT_COUNTER_FILLING_BIT = 11,
123+
IPCT_COUNTER_FILLING = (1 << IPCT_COUNTER_FILLING_BIT),
124+
};
125+
126+
enum ip_conntrack_expect_events {
127+
IPEXP_NEW_BIT = 0,
128+
IPEXP_NEW = (1 << IPEXP_NEW_BIT),
129+
};
130+
131+
#ifdef __KERNEL__
132+
struct ip_conntrack_counter
133+
{
134+
u_int32_t packets;
135+
u_int32_t bytes;
136+
};
137+
138+
struct ip_conntrack_stat
139+
{
140+
unsigned int searched;
141+
unsigned int found;
142+
unsigned int new;
143+
unsigned int invalid;
144+
unsigned int ignore;
145+
unsigned int delete;
146+
unsigned int delete_list;
147+
unsigned int insert;
148+
unsigned int insert_failed;
149+
unsigned int drop;
150+
unsigned int early_drop;
151+
unsigned int error;
152+
unsigned int expect_new;
153+
unsigned int expect_create;
154+
unsigned int expect_delete;
155+
};
156+
157+
#endif /* __KERNEL__ */
158+
159+
#endif /* _NF_CONNTRACK_COMMON_H */

‎include/linux/netfilter/nf_conntrack_ftp.h‎

Lines changed: 44 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,44 @@
1+
#ifndef _NF_CONNTRACK_FTP_H
2+
#define _NF_CONNTRACK_FTP_H
3+
/* FTP tracking. */
4+
5+
/* This enum is exposed to userspace */
6+
enum ip_ct_ftp_type
7+
{
8+
/* PORT command from client */
9+
IP_CT_FTP_PORT,
10+
/* PASV response from server */
11+
IP_CT_FTP_PASV,
12+
/* EPRT command from client */
13+
IP_CT_FTP_EPRT,
14+
/* EPSV response from server */
15+
IP_CT_FTP_EPSV,
16+
};
17+
18+
#ifdef __KERNEL__
19+
20+
#define FTP_PORT 21
21+
22+
#define NUM_SEQ_TO_REMEMBER 2
23+
/* This structure exists only once per master */
24+
struct ip_ct_ftp_master {
25+
/* Valid seq positions for cmd matching after newline */
26+
u_int32_t seq_aft_nl[IP_CT_DIR_MAX][NUM_SEQ_TO_REMEMBER];
27+
/* 0 means seq_match_aft_nl not set */
28+
int seq_aft_nl_num[IP_CT_DIR_MAX];
29+
};
30+
31+
struct ip_conntrack_expect;
32+
33+
/* For NAT to hook in when we find a packet which describes what other
34+
* connection we should expect. */
35+
extern unsigned int (*ip_nat_ftp_hook)(struct sk_buff **pskb,
36+
enum ip_conntrack_info ctinfo,
37+
enum ip_ct_ftp_type type,
38+
unsigned int matchoff,
39+
unsigned int matchlen,
40+
struct ip_conntrack_expect *exp,
41+
u32 *seq);
42+
#endif /* __KERNEL__ */
43+
44+
#endif /* _NF_CONNTRACK_FTP_H */

‎include/linux/netfilter/nf_conntrack_sctp.h‎

Lines changed: 27 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,27 @@
1+
#ifndef _NF_CONNTRACK_SCTP_H
2+
#define _NF_CONNTRACK_SCTP_H
3+
/* SCTP tracking. */
4+
5+
#include <linux/netfilter/nf_conntrack_tuple_common.h>
6+
7+
enum sctp_conntrack {
8+
SCTP_CONNTRACK_NONE,
9+
SCTP_CONNTRACK_CLOSED,
10+
SCTP_CONNTRACK_COOKIE_WAIT,
11+
SCTP_CONNTRACK_COOKIE_ECHOED,
12+
SCTP_CONNTRACK_ESTABLISHED,
13+
SCTP_CONNTRACK_SHUTDOWN_SENT,
14+
SCTP_CONNTRACK_SHUTDOWN_RECD,
15+
SCTP_CONNTRACK_SHUTDOWN_ACK_SENT,
16+
SCTP_CONNTRACK_MAX
17+
};
18+
19+
struct ip_ct_sctp
20+
{
21+
enum sctp_conntrack state;
22+
23+
u_int32_t vtag[IP_CT_DIR_MAX];
24+
u_int32_t ttag[IP_CT_DIR_MAX];
25+
};
26+
27+
#endif /* _NF_CONNTRACK_SCTP_H */

‎include/linux/netfilter/nf_conntrack_tcp.h‎

Lines changed: 56 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,56 @@
1+
#ifndef _NF_CONNTRACK_TCP_H
2+
#define _NF_CONNTRACK_TCP_H
3+
/* TCP tracking. */
4+
5+
/* This is exposed to userspace (ctnetlink) */
6+
enum tcp_conntrack {
7+
TCP_CONNTRACK_NONE,
8+
TCP_CONNTRACK_SYN_SENT,
9+
TCP_CONNTRACK_SYN_RECV,
10+
TCP_CONNTRACK_ESTABLISHED,
11+
TCP_CONNTRACK_FIN_WAIT,
12+
TCP_CONNTRACK_CLOSE_WAIT,
13+
TCP_CONNTRACK_LAST_ACK,
14+
TCP_CONNTRACK_TIME_WAIT,
15+
TCP_CONNTRACK_CLOSE,
16+
TCP_CONNTRACK_LISTEN,
17+
TCP_CONNTRACK_MAX,
18+
TCP_CONNTRACK_IGNORE
19+
};
20+
21+
/* Window scaling is advertised by the sender */
22+
#define IP_CT_TCP_FLAG_WINDOW_SCALE 0x01
23+
24+
/* SACK is permitted by the sender */
25+
#define IP_CT_TCP_FLAG_SACK_PERM 0x02
26+
27+
/* This sender sent FIN first */
28+
#define IP_CT_TCP_FLAG_CLOSE_INIT 0x03
29+
30+
#ifdef __KERNEL__
31+
32+
struct ip_ct_tcp_state {
33+
u_int32_t td_end; /* max of seq + len */
34+
u_int32_t td_maxend; /* max of ack + max(win, 1) */
35+
u_int32_t td_maxwin; /* max(win) */
36+
u_int8_t td_scale; /* window scale factor */
37+
u_int8_t loose; /* used when connection picked up from the middle */
38+
u_int8_t flags; /* per direction options */
39+
};
40+
41+
struct ip_ct_tcp
42+
{
43+
struct ip_ct_tcp_state seen[2]; /* connection parameters per direction */
44+
u_int8_t state; /* state of the connection (enum tcp_conntrack) */
45+
/* For detecting stale connections */
46+
u_int8_t last_dir; /* Direction of the last packet (enum ip_conntrack_dir) */
47+
u_int8_t retrans; /* Number of retransmitted packets */
48+
u_int8_t last_index; /* Index of the last packet */
49+
u_int32_t last_seq; /* Last sequence number seen in dir */
50+
u_int32_t last_ack; /* Last sequence number seen in opposite dir */
51+
u_int32_t last_end; /* Last seq + len */
52+
};
53+
54+
#endif /* __KERNEL__ */
55+
56+
#endif /* _NF_CONNTRACK_TCP_H */

‎include/linux/netfilter/nf_conntrack_tuple_common.h‎

Lines changed: 13 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,13 @@
1+
#ifndef _NF_CONNTRACK_TUPLE_COMMON_H
2+
#define _NF_CONNTRACK_TUPLE_COMMON_H
3+
4+
enum ip_conntrack_dir
5+
{
6+
IP_CT_DIR_ORIGINAL,
7+
IP_CT_DIR_REPLY,
8+
IP_CT_DIR_MAX
9+
};
10+
11+
#define CTINFO2DIR(ctinfo) ((ctinfo) >= IP_CT_IS_REPLY ? IP_CT_DIR_REPLY : IP_CT_DIR_ORIGINAL)
12+
13+
#endif /* _NF_CONNTRACK_TUPLE_COMMON_H */

0 commit comments

Comments
 (0)