This commit was manufactured by cvs2svn to create branch 'vserver'.

[linux-2.6.git] / net / netfilter / xt_physdev.c

diff --git a/net/netfilter/xt_physdev.c b/net/netfilter/xt_physdev.c
new file mode 100644 (file)
index 0000000..5fe4c9d
--- /dev/null
+++ b/net/netfilter/xt_physdev.c
@@ -0,0 +1,159 @@
+/* Kernel module to match the bridge port in and
+ * out device for IP packets coming into contact with a bridge. */
+
+/* (C) 2001-2003 Bart De Schuymer <bdschuym@pandora.be>
+ *
+ * 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/netfilter/xt_physdev.h>
+#include <linux/netfilter/x_tables.h>
+#include <linux/netfilter_bridge.h>
+#define MATCH   1
+#define NOMATCH 0
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Bart De Schuymer <bdschuym@pandora.be>");
+MODULE_DESCRIPTION("iptables bridge physical device match module");
+MODULE_ALIAS("ipt_physdev");
+MODULE_ALIAS("ip6t_physdev");
+
+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)
+{
+       int i;
+       static const char nulldevname[IFNAMSIZ];
+       const struct xt_physdev_info *info = matchinfo;
+       unsigned int ret;
+       const char *indev, *outdev;
+       struct nf_bridge_info *nf_bridge;
+
+       /* Not a bridged IP packet or no info available yet:
+        * LOCAL_OUT/mangle and LOCAL_OUT/nat don't know if
+        * the destination device will be a bridge. */
+       if (!(nf_bridge = skb->nf_bridge)) {
+               /* Return MATCH if the invert flags of the used options are on */
+               if ((info->bitmask & XT_PHYSDEV_OP_BRIDGED) &&
+                   !(info->invert & XT_PHYSDEV_OP_BRIDGED))
+                       return NOMATCH;
+               if ((info->bitmask & XT_PHYSDEV_OP_ISIN) &&
+                   !(info->invert & XT_PHYSDEV_OP_ISIN))
+                       return NOMATCH;
+               if ((info->bitmask & XT_PHYSDEV_OP_ISOUT) &&
+                   !(info->invert & XT_PHYSDEV_OP_ISOUT))
+                       return NOMATCH;
+               if ((info->bitmask & XT_PHYSDEV_OP_IN) &&
+                   !(info->invert & XT_PHYSDEV_OP_IN))
+                       return NOMATCH;
+               if ((info->bitmask & XT_PHYSDEV_OP_OUT) &&
+                   !(info->invert & XT_PHYSDEV_OP_OUT))
+                       return NOMATCH;
+               return MATCH;
+       }
+
+       /* This only makes sense in the FORWARD and POSTROUTING chains */
+       if ((info->bitmask & XT_PHYSDEV_OP_BRIDGED) &&
+           (!!(nf_bridge->mask & BRNF_BRIDGED) ^
+           !(info->invert & XT_PHYSDEV_OP_BRIDGED)))
+               return NOMATCH;
+
+       if ((info->bitmask & XT_PHYSDEV_OP_ISIN &&
+           (!nf_bridge->physindev ^ !!(info->invert & XT_PHYSDEV_OP_ISIN))) ||
+           (info->bitmask & XT_PHYSDEV_OP_ISOUT &&
+           (!nf_bridge->physoutdev ^ !!(info->invert & XT_PHYSDEV_OP_ISOUT))))
+               return NOMATCH;
+
+       if (!(info->bitmask & XT_PHYSDEV_OP_IN))
+               goto match_outdev;
+       indev = nf_bridge->physindev ? nf_bridge->physindev->name : nulldevname;
+       for (i = 0, ret = 0; i < IFNAMSIZ/sizeof(unsigned int); i++) {
+               ret |= (((const unsigned int *)indev)[i]
+                       ^ ((const unsigned int *)info->physindev)[i])
+                       & ((const unsigned int *)info->in_mask)[i];
+       }
+
+       if ((ret == 0) ^ !(info->invert & XT_PHYSDEV_OP_IN))
+               return NOMATCH;
+
+match_outdev:
+       if (!(info->bitmask & XT_PHYSDEV_OP_OUT))
+               return MATCH;
+       outdev = nf_bridge->physoutdev ?
+                nf_bridge->physoutdev->name : nulldevname;
+       for (i = 0, ret = 0; i < IFNAMSIZ/sizeof(unsigned int); i++) {
+               ret |= (((const unsigned int *)outdev)[i]
+                       ^ ((const unsigned int *)info->physoutdev)[i])
+                       & ((const unsigned int *)info->out_mask)[i];
+       }
+
+       return (ret != 0) ^ !(info->invert & XT_PHYSDEV_OP_OUT);
+}
+
+static int
+checkentry(const char *tablename,
+                      const void *ip,
+                      const struct xt_match *match,
+                      void *matchinfo,
+                      unsigned int matchsize,
+                      unsigned int hook_mask)
+{
+       const struct xt_physdev_info *info = matchinfo;
+
+       if (!(info->bitmask & XT_PHYSDEV_OP_MASK) ||
+           info->bitmask & ~XT_PHYSDEV_OP_MASK)
+               return 0;
+       return 1;
+}
+
+static struct xt_match physdev_match = {
+       .name           = "physdev",
+       .match          = match,
+       .matchsize      = sizeof(struct xt_physdev_info),
+       .checkentry     = checkentry,
+       .family         = AF_INET,
+       .me             = THIS_MODULE,
+};
+
+static struct xt_match physdev6_match = {
+       .name           = "physdev",
+       .match          = match,
+       .matchsize      = sizeof(struct xt_physdev_info),
+       .checkentry     = checkentry,
+       .family         = AF_INET6,
+       .me             = THIS_MODULE,
+};
+
+static int __init xt_physdev_init(void)
+{
+       int ret;
+
+       ret = xt_register_match(&physdev_match);
+       if (ret < 0)
+               return ret;
+
+       ret = xt_register_match(&physdev6_match);
+       if (ret < 0)
+               xt_unregister_match(&physdev_match);
+
+       return ret;
+}
+
+static void __exit xt_physdev_fini(void)
+{
+       xt_unregister_match(&physdev_match);
+       xt_unregister_match(&physdev6_match);
+}
+
+module_init(xt_physdev_init);
+module_exit(xt_physdev_fini);