diff options
Diffstat (limited to 'net/ipv4/netfilter/ipt_MARK.c')
| -rw-r--r-- | net/ipv4/netfilter/ipt_MARK.c | 162 |
1 files changed, 162 insertions, 0 deletions
diff --git a/net/ipv4/netfilter/ipt_MARK.c b/net/ipv4/netfilter/ipt_MARK.c new file mode 100644 index 00000000000..33c6f9b63b8 --- /dev/null +++ b/net/ipv4/netfilter/ipt_MARK.c @@ -0,0 +1,162 @@ +/* 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_ipv4/ip_tables.h> +#include <linux/netfilter_ipv4/ipt_MARK.h> + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Marc Boucher <marc@mbsi.ca>"); +MODULE_DESCRIPTION("iptables MARK modification module"); + +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 ipt_mark_target_info *markinfo = targinfo; + + if((*pskb)->nfmark != markinfo->mark) { + (*pskb)->nfmark = markinfo->mark; + (*pskb)->nfcache |= NFC_ALTERED; + } + return IPT_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 ipt_mark_target_info_v1 *markinfo = targinfo; + int mark = 0; + + switch (markinfo->mode) { + case IPT_MARK_SET: + mark = markinfo->mark; + break; + + case IPT_MARK_AND: + mark = (*pskb)->nfmark & markinfo->mark; + break; + + case IPT_MARK_OR: + mark = (*pskb)->nfmark | markinfo->mark; + break; + } + + if((*pskb)->nfmark != mark) { + (*pskb)->nfmark = mark; + (*pskb)->nfcache |= NFC_ALTERED; + } + return IPT_CONTINUE; +} + + +static int +checkentry_v0(const char *tablename, + const struct ipt_entry *e, + void *targinfo, + unsigned int targinfosize, + unsigned int hook_mask) +{ + if (targinfosize != IPT_ALIGN(sizeof(struct ipt_mark_target_info))) { + printk(KERN_WARNING "MARK: targinfosize %u != %Zu\n", + targinfosize, + IPT_ALIGN(sizeof(struct ipt_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; + } + + return 1; +} + +static int +checkentry_v1(const char *tablename, + const struct ipt_entry *e, + void *targinfo, + unsigned int targinfosize, + unsigned int hook_mask) +{ + struct ipt_mark_target_info_v1 *markinfo = targinfo; + + if (targinfosize != IPT_ALIGN(sizeof(struct ipt_mark_target_info_v1))){ + printk(KERN_WARNING "MARK: targinfosize %u != %Zu\n", + targinfosize, + IPT_ALIGN(sizeof(struct ipt_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 != IPT_MARK_SET + && markinfo->mode != IPT_MARK_AND + && markinfo->mode != IPT_MARK_OR) { + printk(KERN_WARNING "MARK: unknown mode %u\n", + markinfo->mode); + return 0; + } + + return 1; +} + +static struct ipt_target ipt_mark_reg_v0 = { + .name = "MARK", + .target = target_v0, + .checkentry = checkentry_v0, + .me = THIS_MODULE, + .revision = 0, +}; + +static struct ipt_target ipt_mark_reg_v1 = { + .name = "MARK", + .target = target_v1, + .checkentry = checkentry_v1, + .me = THIS_MODULE, + .revision = 1, +}; + +static int __init init(void) +{ + int err; + + err = ipt_register_target(&ipt_mark_reg_v0); + if (!err) { + err = ipt_register_target(&ipt_mark_reg_v1); + if (err) + ipt_unregister_target(&ipt_mark_reg_v0); + } + return err; +} + +static void __exit fini(void) +{ + ipt_unregister_target(&ipt_mark_reg_v0); + ipt_unregister_target(&ipt_mark_reg_v1); +} + +module_init(init); +module_exit(fini); |