Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [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/x_tables.h> |
| 10 | #include <linux/netfilter/xt_comment.h> |
| 11 | |
| 12 | MODULE_AUTHOR("Brad Fisher <brad@info-link.net>"); |
| 13 | MODULE_DESCRIPTION("iptables comment match module"); |
| 14 | MODULE_LICENSE("GPL"); |
| 15 | MODULE_ALIAS("ipt_comment"); |
| 16 | MODULE_ALIAS("ip6t_comment"); |
| 17 | |
| 18 | static int |
| 19 | match(const struct sk_buff *skb, |
| 20 | const struct net_device *in, |
| 21 | const struct net_device *out, |
| 22 | const void *matchinfo, |
| 23 | int offset, |
| 24 | unsigned int protooff, |
| 25 | int *hotdrop) |
| 26 | { |
| 27 | /* We always match */ |
| 28 | return 1; |
| 29 | } |
| 30 | |
| 31 | static int |
| 32 | checkentry(const char *tablename, |
| 33 | const void *ip, |
| 34 | void *matchinfo, |
| 35 | unsigned int matchsize, |
| 36 | unsigned int hook_mask) |
| 37 | { |
| 38 | /* Check the size */ |
| 39 | if (matchsize != XT_ALIGN(sizeof(struct xt_comment_info))) |
| 40 | return 0; |
| 41 | return 1; |
| 42 | } |
| 43 | |
| 44 | static struct xt_match comment_match = { |
| 45 | .name = "comment", |
| 46 | .match = match, |
| 47 | .checkentry = checkentry, |
| 48 | .me = THIS_MODULE |
| 49 | }; |
| 50 | |
| 51 | static struct xt_match comment6_match = { |
| 52 | .name = "comment", |
| 53 | .match = match, |
| 54 | .checkentry = checkentry, |
| 55 | .me = THIS_MODULE |
| 56 | }; |
| 57 | |
| 58 | static int __init init(void) |
| 59 | { |
| 60 | int ret; |
| 61 | |
| 62 | ret = xt_register_match(AF_INET, &comment_match); |
| 63 | if (ret) |
| 64 | return ret; |
| 65 | |
| 66 | ret = xt_register_match(AF_INET6, &comment6_match); |
| 67 | if (ret) |
| 68 | xt_unregister_match(AF_INET, &comment_match); |
| 69 | |
| 70 | return ret; |
| 71 | } |
| 72 | |
| 73 | static void __exit fini(void) |
| 74 | { |
| 75 | xt_unregister_match(AF_INET, &comment_match); |
| 76 | xt_unregister_match(AF_INET6, &comment6_match); |
| 77 | } |
| 78 | |
| 79 | module_init(init); |
| 80 | module_exit(fini); |