diff options
author | Harald Welte <laforge@netfilter.org> | 2006-01-12 16:30:04 -0500 |
---|---|---|
committer | David S. Miller <davem@sunset.davemloft.net> | 2006-01-12 17:06:43 -0500 |
commit | 2e4e6a17af35be359cc8f1c924f8f198fbd478cc (patch) | |
tree | cb4b5438dcf9ff9d57518a26124308bcbfffd214 /net/netfilter/xt_pkttype.c | |
parent | 880b005f294454d989783d0984dc554dfe3c8214 (diff) |
[NETFILTER] x_tables: Abstraction layer for {ip,ip6,arp}_tables
This monster-patch tries to do the best job for unifying the data
structures and backend interfaces for the three evil clones ip_tables,
ip6_tables and arp_tables. In an ideal world we would never have
allowed this kind of copy+paste programming... but well, our world
isn't (yet?) ideal.
o introduce a new x_tables module
o {ip,arp,ip6}_tables depend on this x_tables module
o registration functions for tables, matches and targets are only
wrappers around x_tables provided functions
o all matches/targets that are used from ip_tables and ip6_tables
are now implemented as xt_FOOBAR.c files and provide module aliases
to ipt_FOOBAR and ip6t_FOOBAR
o header files for xt_matches are in include/linux/netfilter/,
include/linux/netfilter_{ipv4,ipv6} contains compatibility wrappers
around the xt_FOOBAR.h headers
Based on this patchset we're going to further unify the code,
gradually getting rid of all the layer 3 specific assumptions.
Signed-off-by: Harald Welte <laforge@netfilter.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/netfilter/xt_pkttype.c')
-rw-r--r-- | net/netfilter/xt_pkttype.c | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/net/netfilter/xt_pkttype.c b/net/netfilter/xt_pkttype.c new file mode 100644 index 00000000000..ab1b2630f97 --- /dev/null +++ b/net/netfilter/xt_pkttype.c | |||
@@ -0,0 +1,82 @@ | |||
1 | /* (C) 1999-2001 Michal Ludvig <michal@logix.cz> | ||
2 | * | ||
3 | * This program is free software; you can redistribute it and/or modify | ||
4 | * it under the terms of the GNU General Public License version 2 as | ||
5 | * published by the Free Software Foundation. | ||
6 | */ | ||
7 | |||
8 | #include <linux/module.h> | ||
9 | #include <linux/skbuff.h> | ||
10 | #include <linux/if_ether.h> | ||
11 | #include <linux/if_packet.h> | ||
12 | |||
13 | #include <linux/netfilter/xt_pkttype.h> | ||
14 | #include <linux/netfilter/x_tables.h> | ||
15 | |||
16 | MODULE_LICENSE("GPL"); | ||
17 | MODULE_AUTHOR("Michal Ludvig <michal@logix.cz>"); | ||
18 | MODULE_DESCRIPTION("IP tables match to match on linklayer packet type"); | ||
19 | MODULE_ALIAS("ipt_pkttype"); | ||
20 | MODULE_ALIAS("ip6t_pkttype"); | ||
21 | |||
22 | static int match(const struct sk_buff *skb, | ||
23 | const struct net_device *in, | ||
24 | const struct net_device *out, | ||
25 | const void *matchinfo, | ||
26 | int offset, | ||
27 | unsigned int protoff, | ||
28 | int *hotdrop) | ||
29 | { | ||
30 | const struct xt_pkttype_info *info = matchinfo; | ||
31 | |||
32 | return (skb->pkt_type == info->pkttype) ^ info->invert; | ||
33 | } | ||
34 | |||
35 | static int checkentry(const char *tablename, | ||
36 | const void *ip, | ||
37 | void *matchinfo, | ||
38 | unsigned int matchsize, | ||
39 | unsigned int hook_mask) | ||
40 | { | ||
41 | if (matchsize != XT_ALIGN(sizeof(struct xt_pkttype_info))) | ||
42 | return 0; | ||
43 | |||
44 | return 1; | ||
45 | } | ||
46 | |||
47 | static struct xt_match pkttype_match = { | ||
48 | .name = "pkttype", | ||
49 | .match = &match, | ||
50 | .checkentry = &checkentry, | ||
51 | .me = THIS_MODULE, | ||
52 | }; | ||
53 | static struct xt_match pkttype6_match = { | ||
54 | .name = "pkttype", | ||
55 | .match = &match, | ||
56 | .checkentry = &checkentry, | ||
57 | .me = THIS_MODULE, | ||
58 | }; | ||
59 | |||
60 | |||
61 | static int __init init(void) | ||
62 | { | ||
63 | int ret; | ||
64 | ret = xt_register_match(AF_INET, &pkttype_match); | ||
65 | if (ret) | ||
66 | return ret; | ||
67 | |||
68 | ret = xt_register_match(AF_INET6, &pkttype6_match); | ||
69 | if (ret) | ||
70 | xt_unregister_match(AF_INET, &pkttype_match); | ||
71 | |||
72 | return ret; | ||
73 | } | ||
74 | |||
75 | static void __exit fini(void) | ||
76 | { | ||
77 | xt_unregister_match(AF_INET, &pkttype_match); | ||
78 | xt_unregister_match(AF_INET6, &pkttype6_match); | ||
79 | } | ||
80 | |||
81 | module_init(init); | ||
82 | module_exit(fini); | ||