Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / net / netfilter / xt_DSCP.c

diff --git a/kernel/net/netfilter/xt_DSCP.c b/kernel/net/netfilter/xt_DSCP.c
new file mode 100644 (file)
index 0000000..3f83d38
--- /dev/null
+++ b/kernel/net/netfilter/xt_DSCP.c
@@ -0,0 +1,166 @@
+/* x_tables module for setting the IPv4/IPv6 DSCP field, Version 1.8
+ *
+ * (C) 2002 by Harald Welte <laforge@netfilter.org>
+ * based on ipt_FTOS.c (C) 2000 by Matthew G. Marsh <mgm@paktronix.com>
+ *
+ * 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.
+ *
+ * See RFC2474 for a description of the DSCP field within the IP Header.
+*/
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/ip.h>
+#include <linux/ipv6.h>
+#include <net/dsfield.h>
+
+#include <linux/netfilter/x_tables.h>
+#include <linux/netfilter/xt_DSCP.h>
+
+MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
+MODULE_DESCRIPTION("Xtables: DSCP/TOS field modification");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("ipt_DSCP");
+MODULE_ALIAS("ip6t_DSCP");
+MODULE_ALIAS("ipt_TOS");
+MODULE_ALIAS("ip6t_TOS");
+
+static unsigned int
+dscp_tg(struct sk_buff *skb, const struct xt_action_param *par)
+{
+       const struct xt_DSCP_info *dinfo = par->targinfo;
+       u_int8_t dscp = ipv4_get_dsfield(ip_hdr(skb)) >> XT_DSCP_SHIFT;
+
+       if (dscp != dinfo->dscp) {
+               if (!skb_make_writable(skb, sizeof(struct iphdr)))
+                       return NF_DROP;
+
+               ipv4_change_dsfield(ip_hdr(skb),
+                                   (__force __u8)(~XT_DSCP_MASK),
+                                   dinfo->dscp << XT_DSCP_SHIFT);
+
+       }
+       return XT_CONTINUE;
+}
+
+static unsigned int
+dscp_tg6(struct sk_buff *skb, const struct xt_action_param *par)
+{
+       const struct xt_DSCP_info *dinfo = par->targinfo;
+       u_int8_t dscp = ipv6_get_dsfield(ipv6_hdr(skb)) >> XT_DSCP_SHIFT;
+
+       if (dscp != dinfo->dscp) {
+               if (!skb_make_writable(skb, sizeof(struct ipv6hdr)))
+                       return NF_DROP;
+
+               ipv6_change_dsfield(ipv6_hdr(skb),
+                                   (__force __u8)(~XT_DSCP_MASK),
+                                   dinfo->dscp << XT_DSCP_SHIFT);
+       }
+       return XT_CONTINUE;
+}
+
+static int dscp_tg_check(const struct xt_tgchk_param *par)
+{
+       const struct xt_DSCP_info *info = par->targinfo;
+
+       if (info->dscp > XT_DSCP_MAX) {
+               pr_info("dscp %x out of range\n", info->dscp);
+               return -EDOM;
+       }
+       return 0;
+}
+
+static unsigned int
+tos_tg(struct sk_buff *skb, const struct xt_action_param *par)
+{
+       const struct xt_tos_target_info *info = par->targinfo;
+       struct iphdr *iph = ip_hdr(skb);
+       u_int8_t orig, nv;
+
+       orig = ipv4_get_dsfield(iph);
+       nv   = (orig & ~info->tos_mask) ^ info->tos_value;
+
+       if (orig != nv) {
+               if (!skb_make_writable(skb, sizeof(struct iphdr)))
+                       return NF_DROP;
+               iph = ip_hdr(skb);
+               ipv4_change_dsfield(iph, 0, nv);
+       }
+
+       return XT_CONTINUE;
+}
+
+static unsigned int
+tos_tg6(struct sk_buff *skb, const struct xt_action_param *par)
+{
+       const struct xt_tos_target_info *info = par->targinfo;
+       struct ipv6hdr *iph = ipv6_hdr(skb);
+       u_int8_t orig, nv;
+
+       orig = ipv6_get_dsfield(iph);
+       nv   = (orig & ~info->tos_mask) ^ info->tos_value;
+
+       if (orig != nv) {
+               if (!skb_make_writable(skb, sizeof(struct iphdr)))
+                       return NF_DROP;
+               iph = ipv6_hdr(skb);
+               ipv6_change_dsfield(iph, 0, nv);
+       }
+
+       return XT_CONTINUE;
+}
+
+static struct xt_target dscp_tg_reg[] __read_mostly = {
+       {
+               .name           = "DSCP",
+               .family         = NFPROTO_IPV4,
+               .checkentry     = dscp_tg_check,
+               .target         = dscp_tg,
+               .targetsize     = sizeof(struct xt_DSCP_info),
+               .table          = "mangle",
+               .me             = THIS_MODULE,
+       },
+       {
+               .name           = "DSCP",
+               .family         = NFPROTO_IPV6,
+               .checkentry     = dscp_tg_check,
+               .target         = dscp_tg6,
+               .targetsize     = sizeof(struct xt_DSCP_info),
+               .table          = "mangle",
+               .me             = THIS_MODULE,
+       },
+       {
+               .name           = "TOS",
+               .revision       = 1,
+               .family         = NFPROTO_IPV4,
+               .table          = "mangle",
+               .target         = tos_tg,
+               .targetsize     = sizeof(struct xt_tos_target_info),
+               .me             = THIS_MODULE,
+       },
+       {
+               .name           = "TOS",
+               .revision       = 1,
+               .family         = NFPROTO_IPV6,
+               .table          = "mangle",
+               .target         = tos_tg6,
+               .targetsize     = sizeof(struct xt_tos_target_info),
+               .me             = THIS_MODULE,
+       },
+};
+
+static int __init dscp_tg_init(void)
+{
+       return xt_register_targets(dscp_tg_reg, ARRAY_SIZE(dscp_tg_reg));
+}
+
+static void __exit dscp_tg_exit(void)
+{
+       xt_unregister_targets(dscp_tg_reg, ARRAY_SIZE(dscp_tg_reg));
+}
+
+module_init(dscp_tg_init);
+module_exit(dscp_tg_exit);