From 9ba1627617d396135a4d679542a3623d5819e628 Mon Sep 17 00:00:00 2001 From: Yasuyuki Kozakai Date: Tue, 22 Aug 2006 00:29:37 -0700 Subject: [NETFILTER]: x_tables: replace IPv4 dscp match by address family independent version This replaces IPv4 dscp match by address family independent version. This also - utilizes dsfield.h to get the DS field in IPv4/IPv6 header, and - checks for the DSCP value from user space. - fixes Kconfig help text. Signed-off-by: Yasuyuki Kozakai Signed-off-by: Patrick McHardy Signed-off-by: David S. Miller --- net/netfilter/Kconfig | 11 +++++ net/netfilter/Makefile | 1 + net/netfilter/xt_dscp.c | 113 ++++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 125 insertions(+) create mode 100644 net/netfilter/xt_dscp.c (limited to 'net/netfilter') diff --git a/net/netfilter/Kconfig b/net/netfilter/Kconfig index a9894ddfd72a..f781405f5d65 100644 --- a/net/netfilter/Kconfig +++ b/net/netfilter/Kconfig @@ -263,6 +263,17 @@ config NETFILTER_XT_MATCH_DCCP If you want to compile it as a module, say M here and read . If unsure, say `N'. +config NETFILTER_XT_MATCH_DSCP + tristate '"DSCP" match support' + depends on NETFILTER_XTABLES + help + This option adds a `DSCP' match, which allows you to match against + the IPv4/IPv6 header DSCP field (differentiated services codepoint). + + The DSCP field can have any value between 0x0 and 0x3f inclusive. + + To compile it as a module, choose M here. If unsure, say N. + config NETFILTER_XT_MATCH_ESP tristate '"ESP" match support' depends on NETFILTER_XTABLES diff --git a/net/netfilter/Makefile b/net/netfilter/Makefile index 6fa4b7580458..0b8a70c1df46 100644 --- a/net/netfilter/Makefile +++ b/net/netfilter/Makefile @@ -37,6 +37,7 @@ obj-$(CONFIG_NETFILTER_XT_MATCH_CONNBYTES) += xt_connbytes.o obj-$(CONFIG_NETFILTER_XT_MATCH_CONNMARK) += xt_connmark.o obj-$(CONFIG_NETFILTER_XT_MATCH_CONNTRACK) += xt_conntrack.o obj-$(CONFIG_NETFILTER_XT_MATCH_DCCP) += xt_dccp.o +obj-$(CONFIG_NETFILTER_XT_MATCH_DSCP) += xt_dscp.o obj-$(CONFIG_NETFILTER_XT_MATCH_ESP) += xt_esp.o obj-$(CONFIG_NETFILTER_XT_MATCH_HELPER) += xt_helper.o obj-$(CONFIG_NETFILTER_XT_MATCH_LENGTH) += xt_length.o diff --git a/net/netfilter/xt_dscp.c b/net/netfilter/xt_dscp.c new file mode 100644 index 000000000000..82e250d1f007 --- /dev/null +++ b/net/netfilter/xt_dscp.c @@ -0,0 +1,113 @@ +/* IP tables module for matching the value of the IPv4/IPv6 DSCP field + * + * xt_dscp.c,v 1.3 2002/08/05 19:00:21 laforge Exp + * + * (C) 2002 by Harald Welte + * + * 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 +#include + +MODULE_AUTHOR("Harald Welte "); +MODULE_DESCRIPTION("x_tables DSCP matching module"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("ipt_dscp"); +MODULE_ALIAS("ip6t_dscp"); + +static int match(const struct sk_buff *skb, + const struct net_device *in, + const struct net_device *out, + const struct xt_match *match, + const void *matchinfo, + int offset, + unsigned int protoff, + int *hotdrop) +{ + const struct xt_dscp_info *info = matchinfo; + u_int8_t dscp = ipv4_get_dsfield(skb->nh.iph) >> XT_DSCP_SHIFT; + + return (dscp == info->dscp) ^ !!info->invert; +} + +static int match6(const struct sk_buff *skb, + const struct net_device *in, + const struct net_device *out, + const struct xt_match *match, + const void *matchinfo, + int offset, + unsigned int protoff, + int *hotdrop) +{ + const struct xt_dscp_info *info = matchinfo; + u_int8_t dscp = ipv6_get_dsfield(skb->nh.ipv6h) >> XT_DSCP_SHIFT; + + return (dscp == info->dscp) ^ !!info->invert; +} + +static int checkentry(const char *tablename, + const void *info, + const struct xt_match *match, + void *matchinfo, + unsigned int matchsize, + unsigned int hook_mask) +{ + const u_int8_t dscp = ((struct xt_dscp_info *)matchinfo)->dscp; + + if (dscp > XT_DSCP_MAX) { + printk(KERN_ERR "xt_dscp: dscp %x out of range\n", dscp); + return 0; + } + + return 1; +} + +static struct xt_match dscp_match = { + .name = "dscp", + .match = match, + .checkentry = checkentry, + .matchsize = sizeof(struct xt_dscp_info), + .family = AF_INET, + .me = THIS_MODULE, +}; + +static struct xt_match dscp6_match = { + .name = "dscp", + .match = match6, + .checkentry = checkentry, + .matchsize = sizeof(struct xt_dscp_info), + .family = AF_INET6, + .me = THIS_MODULE, +}; + +static int __init xt_dscp_match_init(void) +{ + int ret; + ret = xt_register_match(&dscp_match); + if (ret) + return ret; + + ret = xt_register_match(&dscp6_match); + if (ret) + xt_unregister_match(&dscp_match); + + return ret; +} + +static void __exit xt_dscp_match_fini(void) +{ + xt_unregister_match(&dscp_match); + xt_unregister_match(&dscp6_match); +} + +module_init(xt_dscp_match_init); +module_exit(xt_dscp_match_fini); -- cgit v1.2.3