Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * This is a module which is used for setting the skb->priority field |
| 3 | * of an skb for qdisc classification. |
| 4 | */ |
| 5 | |
| 6 | /* (C) 2001-2002 Patrick McHardy <kaber@trash.net> |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License version 2 as |
| 10 | * published by the Free Software Foundation. |
| 11 | */ |
| 12 | |
| 13 | #include <linux/module.h> |
| 14 | #include <linux/skbuff.h> |
| 15 | #include <linux/ip.h> |
| 16 | #include <net/checksum.h> |
| 17 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 18 | #include <linux/netfilter/x_tables.h> |
| 19 | #include <linux/netfilter/xt_CLASSIFY.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | |
| 21 | MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); |
| 22 | MODULE_LICENSE("GPL"); |
| 23 | MODULE_DESCRIPTION("iptables qdisc classification target module"); |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 24 | MODULE_ALIAS("ipt_CLASSIFY"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | |
| 26 | static unsigned int |
| 27 | target(struct sk_buff **pskb, |
| 28 | const struct net_device *in, |
| 29 | const struct net_device *out, |
| 30 | unsigned int hooknum, |
| 31 | const void *targinfo, |
| 32 | void *userinfo) |
| 33 | { |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 34 | const struct xt_classify_target_info *clinfo = targinfo; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 36 | if ((*pskb)->priority != clinfo->priority) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | (*pskb)->priority = clinfo->priority; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 39 | return XT_CONTINUE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | } |
| 41 | |
| 42 | static int |
| 43 | checkentry(const char *tablename, |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 44 | const void *e, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | void *targinfo, |
| 46 | unsigned int targinfosize, |
| 47 | unsigned int hook_mask) |
| 48 | { |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 49 | if (targinfosize != XT_ALIGN(sizeof(struct xt_classify_target_info))){ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | printk(KERN_ERR "CLASSIFY: invalid size (%u != %Zu).\n", |
| 51 | targinfosize, |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 52 | XT_ALIGN(sizeof(struct xt_classify_target_info))); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | return 0; |
| 54 | } |
| 55 | |
| 56 | if (hook_mask & ~((1 << NF_IP_LOCAL_OUT) | (1 << NF_IP_FORWARD) | |
| 57 | (1 << NF_IP_POST_ROUTING))) { |
| 58 | printk(KERN_ERR "CLASSIFY: only valid in LOCAL_OUT, FORWARD " |
| 59 | "and POST_ROUTING.\n"); |
| 60 | return 0; |
| 61 | } |
| 62 | |
| 63 | if (strcmp(tablename, "mangle") != 0) { |
| 64 | printk(KERN_ERR "CLASSIFY: can only be called from " |
| 65 | "\"mangle\" table, not \"%s\".\n", |
| 66 | tablename); |
| 67 | return 0; |
| 68 | } |
| 69 | |
| 70 | return 1; |
| 71 | } |
| 72 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 73 | static struct xt_target classify_reg = { |
| 74 | .name = "CLASSIFY", |
| 75 | .target = target, |
| 76 | .checkentry = checkentry, |
| 77 | .me = THIS_MODULE, |
| 78 | }; |
| 79 | static struct xt_target classify6_reg = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 80 | .name = "CLASSIFY", |
| 81 | .target = target, |
| 82 | .checkentry = checkentry, |
| 83 | .me = THIS_MODULE, |
| 84 | }; |
| 85 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 86 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 87 | static int __init init(void) |
| 88 | { |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 89 | int ret; |
| 90 | |
| 91 | ret = xt_register_target(AF_INET, &classify_reg); |
| 92 | if (ret) |
| 93 | return ret; |
| 94 | |
| 95 | ret = xt_register_target(AF_INET6, &classify6_reg); |
| 96 | if (ret) |
| 97 | xt_unregister_target(AF_INET, &classify_reg); |
| 98 | |
| 99 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 100 | } |
| 101 | |
| 102 | static void __exit fini(void) |
| 103 | { |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 104 | xt_unregister_target(AF_INET, &classify_reg); |
| 105 | xt_unregister_target(AF_INET6, &classify6_reg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | } |
| 107 | |
| 108 | module_init(init); |
| 109 | module_exit(fini); |