Commit | Line | Data |
---|---|---|
1da177e4 LT |
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 | ||
18 | #include <linux/netfilter_ipv4/ip_tables.h> | |
19 | #include <linux/netfilter_ipv4/ipt_CLASSIFY.h> | |
20 | ||
21 | MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); | |
22 | MODULE_LICENSE("GPL"); | |
23 | MODULE_DESCRIPTION("iptables qdisc classification target module"); | |
24 | ||
25 | static unsigned int | |
26 | target(struct sk_buff **pskb, | |
27 | const struct net_device *in, | |
28 | const struct net_device *out, | |
29 | unsigned int hooknum, | |
30 | const void *targinfo, | |
31 | void *userinfo) | |
32 | { | |
33 | const struct ipt_classify_target_info *clinfo = targinfo; | |
34 | ||
35 | if((*pskb)->priority != clinfo->priority) { | |
36 | (*pskb)->priority = clinfo->priority; | |
37 | (*pskb)->nfcache |= NFC_ALTERED; | |
38 | } | |
39 | ||
40 | return IPT_CONTINUE; | |
41 | } | |
42 | ||
43 | static int | |
44 | checkentry(const char *tablename, | |
45 | const struct ipt_entry *e, | |
46 | void *targinfo, | |
47 | unsigned int targinfosize, | |
48 | unsigned int hook_mask) | |
49 | { | |
50 | if (targinfosize != IPT_ALIGN(sizeof(struct ipt_classify_target_info))){ | |
51 | printk(KERN_ERR "CLASSIFY: invalid size (%u != %Zu).\n", | |
52 | targinfosize, | |
53 | IPT_ALIGN(sizeof(struct ipt_classify_target_info))); | |
54 | return 0; | |
55 | } | |
56 | ||
57 | if (hook_mask & ~((1 << NF_IP_LOCAL_OUT) | (1 << NF_IP_FORWARD) | | |
58 | (1 << NF_IP_POST_ROUTING))) { | |
59 | printk(KERN_ERR "CLASSIFY: only valid in LOCAL_OUT, FORWARD " | |
60 | "and POST_ROUTING.\n"); | |
61 | return 0; | |
62 | } | |
63 | ||
64 | if (strcmp(tablename, "mangle") != 0) { | |
65 | printk(KERN_ERR "CLASSIFY: can only be called from " | |
66 | "\"mangle\" table, not \"%s\".\n", | |
67 | tablename); | |
68 | return 0; | |
69 | } | |
70 | ||
71 | return 1; | |
72 | } | |
73 | ||
74 | static struct ipt_target ipt_classify_reg = { | |
75 | .name = "CLASSIFY", | |
76 | .target = target, | |
77 | .checkentry = checkentry, | |
78 | .me = THIS_MODULE, | |
79 | }; | |
80 | ||
81 | static int __init init(void) | |
82 | { | |
83 | return ipt_register_target(&ipt_classify_reg); | |
84 | } | |
85 | ||
86 | static void __exit fini(void) | |
87 | { | |
88 | ipt_unregister_target(&ipt_classify_reg); | |
89 | } | |
90 | ||
91 | module_init(init); | |
92 | module_exit(fini); |