diff options
Diffstat (limited to 'net/netfilter/xt_MARK.c')
| -rw-r--r-- | net/netfilter/xt_MARK.c | 191 |
1 files changed, 191 insertions, 0 deletions
diff --git a/net/netfilter/xt_MARK.c b/net/netfilter/xt_MARK.c new file mode 100644 index 000000000000..0c11ee9550f3 --- /dev/null +++ b/net/netfilter/xt_MARK.c @@ -0,0 +1,191 @@ +/* This is a module which is used for setting the NFMARK field of an skb. */ + +/* (C) 1999-2001 Marc Boucher <marc@mbsi.ca> + * + * 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 <linux/module.h> +#include <linux/skbuff.h> +#include <linux/ip.h> +#include <net/checksum.h> + +#include <linux/netfilter/x_tables.h> +#include <linux/netfilter/xt_MARK.h> + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Marc Boucher <marc@mbsi.ca>"); +MODULE_DESCRIPTION("ip[6]tables MARK modification module"); +MODULE_ALIAS("ipt_MARK"); +MODULE_ALIAS("ip6t_MARK"); + +static unsigned int +target_v0(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_mark_target_info *markinfo = targinfo; + + if((*pskb)->nfmark != markinfo->mark) + (*pskb)->nfmark = markinfo->mark; + + return XT_CONTINUE; +} + +static unsigned int +target_v1(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_mark_target_info_v1 *markinfo = targinfo; + int mark = 0; + + switch (markinfo->mode) { + case XT_MARK_SET: + mark = markinfo->mark; + break; + + case XT_MARK_AND: + mark = (*pskb)->nfmark & markinfo->mark; + break; + + case XT_MARK_OR: + mark = (*pskb)->nfmark | markinfo->mark; + break; + } + + if((*pskb)->nfmark != mark) + (*pskb)->nfmark = mark; + + return XT_CONTINUE; +} + + +static int +checkentry_v0(const char *tablename, + const void *entry, + void *targinfo, + unsigned int targinfosize, + unsigned int hook_mask) +{ + struct xt_mark_target_info *markinfo = targinfo; + + if (targinfosize != XT_ALIGN(sizeof(struct xt_mark_target_info))) { + printk(KERN_WARNING "MARK: targinfosize %u != %Zu\n", + targinfosize, + XT_ALIGN(sizeof(struct xt_mark_target_info))); + return 0; + } + + if (strcmp(tablename, "mangle") != 0) { + printk(KERN_WARNING "MARK: can only be called from \"mangle\" table, not \"%s\"\n", tablename); + return 0; + } + + if (markinfo->mark > 0xffffffff) { + printk(KERN_WARNING "MARK: Only supports 32bit wide mark\n"); + return 0; + } + + return 1; +} + +static int +checkentry_v1(const char *tablename, + const void *entry, + void *targinfo, + unsigned int targinfosize, + unsigned int hook_mask) +{ + struct xt_mark_target_info_v1 *markinfo = targinfo; + + if (targinfosize != XT_ALIGN(sizeof(struct xt_mark_target_info_v1))){ + printk(KERN_WARNING "MARK: targinfosize %u != %Zu\n", + targinfosize, + XT_ALIGN(sizeof(struct xt_mark_target_info_v1))); + return 0; + } + + if (strcmp(tablename, "mangle") != 0) { + printk(KERN_WARNING "MARK: can only be called from \"mangle\" table, not \"%s\"\n", tablename); + return 0; + } + + if (markinfo->mode != XT_MARK_SET + && markinfo->mode != XT_MARK_AND + && markinfo->mode != XT_MARK_OR) { + printk(KERN_WARNING "MARK: unknown mode %u\n", + markinfo->mode); + return 0; + } + + if (markinfo->mark > 0xffffffff) { + printk(KERN_WARNING "MARK: Only supports 32bit wide mark\n"); + return 0; + } + + return 1; +} + +static struct xt_target ipt_mark_reg_v0 = { + .name = "MARK", + .target = target_v0, + .checkentry = checkentry_v0, + .me = THIS_MODULE, + .revision = 0, +}; + +static struct xt_target ipt_mark_reg_v1 = { + .name = "MARK", + .target = target_v1, + .checkentry = checkentry_v1, + .me = THIS_MODULE, + .revision = 1, +}; + +static struct xt_target ip6t_mark_reg_v0 = { + .name = "MARK", + .target = target_v0, + .checkentry = checkentry_v0, + .me = THIS_MODULE, + .revision = 0, +}; + +static int __init init(void) +{ + int err; + + err = xt_register_target(AF_INET, &ipt_mark_reg_v0); + if (err) + return err; + + err = xt_register_target(AF_INET, &ipt_mark_reg_v1); + if (err) + xt_unregister_target(AF_INET, &ipt_mark_reg_v0); + + err = xt_register_target(AF_INET6, &ip6t_mark_reg_v0); + if (err) { + xt_unregister_target(AF_INET, &ipt_mark_reg_v0); + xt_unregister_target(AF_INET, &ipt_mark_reg_v1); + } + + return err; +} + +static void __exit fini(void) +{ + xt_unregister_target(AF_INET, &ipt_mark_reg_v0); + xt_unregister_target(AF_INET, &ipt_mark_reg_v1); + xt_unregister_target(AF_INET6, &ip6t_mark_reg_v0); +} + +module_init(init); +module_exit(fini); |