Merge branch 'for-rmk' of git://aeryn.fluff.org.uk/bjdooks/linux

[linux-2.6] / net / netfilter / xt_DSCP.c

diff --git a/net/netfilter/xt_DSCP.c b/net/netfilter/xt_DSCP.c
index 18823558797928419ede3191500ea36f4089f080..97efd74c04fef2c91899c3d773b184bf96d2dfdc 100644 (file)
--- a/net/netfilter/xt_DSCP.c
+++ b/net/netfilter/xt_DSCP.c
@@ -18,12 +18,15 @@
 
 #include <linux/netfilter/x_tables.h>
 #include <linux/netfilter/xt_DSCP.h>
+#include <linux/netfilter_ipv4/ipt_TOS.h>
 
 MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
-MODULE_DESCRIPTION("x_tables DSCP modification module");
+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 net_device *in,
@@ -76,6 +79,89 @@ dscp_tg_check(const char *tablename, const void *e_void,
        return true;
 }
 
+static unsigned int
+tos_tg_v0(struct sk_buff *skb, const struct net_device *in,
+          const struct net_device *out, unsigned int hooknum,
+          const struct xt_target *target, const void *targinfo)
+{
+       const struct ipt_tos_target_info *info = targinfo;
+       struct iphdr *iph = ip_hdr(skb);
+       u_int8_t oldtos;
+
+       if ((iph->tos & IPTOS_TOS_MASK) != info->tos) {
+               if (!skb_make_writable(skb, sizeof(struct iphdr)))
+                       return NF_DROP;
+
+               iph      = ip_hdr(skb);
+               oldtos   = iph->tos;
+               iph->tos = (iph->tos & IPTOS_PREC_MASK) | info->tos;
+               csum_replace2(&iph->check, htons(oldtos), htons(iph->tos));
+       }
+
+       return XT_CONTINUE;
+}
+
+static bool
+tos_tg_check_v0(const char *tablename, const void *e_void,
+                const struct xt_target *target, void *targinfo,
+                unsigned int hook_mask)
+{
+       const u_int8_t tos = ((struct ipt_tos_target_info *)targinfo)->tos;
+
+       if (tos != IPTOS_LOWDELAY && tos != IPTOS_THROUGHPUT &&
+           tos != IPTOS_RELIABILITY && tos != IPTOS_MINCOST &&
+           tos != IPTOS_NORMALSVC) {
+               printk(KERN_WARNING "TOS: bad tos value %#x\n", tos);
+               return false;
+       }
+
+       return true;
+}
+
+static unsigned int
+tos_tg(struct sk_buff *skb, const struct net_device *in,
+       const struct net_device *out, unsigned int hooknum,
+       const struct xt_target *target, const void *targinfo)
+{
+       const struct xt_tos_target_info *info = 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 net_device *in,
+        const struct net_device *out, unsigned int hooknum,
+        const struct xt_target *target, const void *targinfo)
+{
+       const struct xt_tos_target_info *info = 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",
@@ -95,6 +181,34 @@ static struct xt_target dscp_tg_reg[] __read_mostly = {
                .table          = "mangle",
                .me             = THIS_MODULE,
        },
+       {
+               .name           = "TOS",
+               .revision       = 0,
+               .family         = AF_INET,
+               .table          = "mangle",
+               .target         = tos_tg_v0,
+               .targetsize     = sizeof(struct ipt_tos_target_info),
+               .checkentry     = tos_tg_check_v0,
+               .me             = THIS_MODULE,
+       },
+       {
+               .name           = "TOS",
+               .revision       = 1,
+               .family         = AF_INET,
+               .table          = "mangle",
+               .target         = tos_tg,
+               .targetsize     = sizeof(struct xt_tos_target_info),
+               .me             = THIS_MODULE,
+       },
+       {
+               .name           = "TOS",
+               .revision       = 1,
+               .family         = AF_INET6,
+               .table          = "mangle",
+               .target         = tos_tg6,
+               .targetsize     = sizeof(struct xt_tos_target_info),
+               .me             = THIS_MODULE,
+       },
 };
 
 static int __init dscp_tg_init(void)