Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Implements a dummy match to allow attaching comments to rules |
| 3 | * |
| 4 | * 2003-05-13 Brad Fisher (brad@info-link.net) |
| 5 | */ |
| 6 | |
| 7 | #include <linux/module.h> |
| 8 | #include <linux/skbuff.h> |
| 9 | #include <linux/netfilter_ipv4/ip_tables.h> |
| 10 | #include <linux/netfilter_ipv4/ipt_comment.h> |
| 11 | |
| 12 | MODULE_AUTHOR("Brad Fisher <brad@info-link.net>"); |
| 13 | MODULE_DESCRIPTION("iptables comment match module"); |
| 14 | MODULE_LICENSE("GPL"); |
| 15 | |
| 16 | static int |
| 17 | match(const struct sk_buff *skb, |
| 18 | const struct net_device *in, |
| 19 | const struct net_device *out, |
| 20 | const void *matchinfo, |
| 21 | int offset, |
| 22 | int *hotdrop) |
| 23 | { |
| 24 | /* We always match */ |
| 25 | return 1; |
| 26 | } |
| 27 | |
| 28 | static int |
| 29 | checkentry(const char *tablename, |
| 30 | const struct ipt_ip *ip, |
| 31 | void *matchinfo, |
| 32 | unsigned int matchsize, |
| 33 | unsigned int hook_mask) |
| 34 | { |
| 35 | /* Check the size */ |
| 36 | if (matchsize != IPT_ALIGN(sizeof(struct ipt_comment_info))) |
| 37 | return 0; |
| 38 | return 1; |
| 39 | } |
| 40 | |
| 41 | static struct ipt_match comment_match = { |
| 42 | .name = "comment", |
| 43 | .match = match, |
| 44 | .checkentry = checkentry, |
| 45 | .me = THIS_MODULE |
| 46 | }; |
| 47 | |
| 48 | static int __init init(void) |
| 49 | { |
| 50 | return ipt_register_match(&comment_match); |
| 51 | } |
| 52 | |
| 53 | static void __exit fini(void) |
| 54 | { |
| 55 | ipt_unregister_match(&comment_match); |
| 56 | } |
| 57 | |
| 58 | module_init(init); |
| 59 | module_exit(fini); |