From 2e4e6a17af35be359cc8f1c924f8f198fbd478cc Mon Sep 17 00:00:00 2001 From: Harald Welte Date: Thu, 12 Jan 2006 13:30:04 -0800 Subject: [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 Signed-off-by: David S. Miller --- net/netfilter/xt_CLASSIFY.c | 109 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 109 insertions(+) create mode 100644 net/netfilter/xt_CLASSIFY.c (limited to 'net/netfilter/xt_CLASSIFY.c') diff --git a/net/netfilter/xt_CLASSIFY.c b/net/netfilter/xt_CLASSIFY.c new file mode 100644 index 00000000000..78ee266a12e --- /dev/null +++ b/net/netfilter/xt_CLASSIFY.c @@ -0,0 +1,109 @@ +/* + * This is a module which is used for setting the skb->priority field + * of an skb for qdisc classification. + */ + +/* (C) 2001-2002 Patrick McHardy + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include +#include +#include +#include + +#include +#include + +MODULE_AUTHOR("Patrick McHardy "); +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("iptables qdisc classification target module"); +MODULE_ALIAS("ipt_CLASSIFY"); + +static unsigned int +target(struct sk_buff **pskb, + const struct net_device *in, + const struct net_device *out, + unsigned int hooknum, + const void *targinfo, + void *userinfo) +{ + const struct xt_classify_target_info *clinfo = targinfo; + + if ((*pskb)->priority != clinfo->priority) + (*pskb)->priority = clinfo->priority; + + return XT_CONTINUE; +} + +static int +checkentry(const char *tablename, + const void *e, + void *targinfo, + unsigned int targinfosize, + unsigned int hook_mask) +{ + if (targinfosize != XT_ALIGN(sizeof(struct xt_classify_target_info))){ + printk(KERN_ERR "CLASSIFY: invalid size (%u != %Zu).\n", + targinfosize, + XT_ALIGN(sizeof(struct xt_classify_target_info))); + return 0; + } + + if (hook_mask & ~((1 << NF_IP_LOCAL_OUT) | (1 << NF_IP_FORWARD) | + (1 << NF_IP_POST_ROUTING))) { + printk(KERN_ERR "CLASSIFY: only valid in LOCAL_OUT, FORWARD " + "and POST_ROUTING.\n"); + return 0; + } + + if (strcmp(tablename, "mangle") != 0) { + printk(KERN_ERR "CLASSIFY: can only be called from " + "\"mangle\" table, not \"%s\".\n", + tablename); + return 0; + } + + return 1; +} + +static struct xt_target classify_reg = { + .name = "CLASSIFY", + .target = target, + .checkentry = checkentry, + .me = THIS_MODULE, +}; +static struct xt_target classify6_reg = { + .name = "CLASSIFY", + .target = target, + .checkentry = checkentry, + .me = THIS_MODULE, +}; + + +static int __init init(void) +{ + int ret; + + ret = xt_register_target(AF_INET, &classify_reg); + if (ret) + return ret; + + ret = xt_register_target(AF_INET6, &classify6_reg); + if (ret) + xt_unregister_target(AF_INET, &classify_reg); + + return ret; +} + +static void __exit fini(void) +{ + xt_unregister_target(AF_INET, &classify_reg); + xt_unregister_target(AF_INET6, &classify6_reg); +} + +module_init(init); +module_exit(fini); -- cgit v1.2.3