kernel: add support for 3.9-rc2

[openwrt.git] / target / linux / generic / patches-3.9 / 611-netfilter_match_bypass_default_table.patch

diff --git a/target/linux/generic/patches-3.9/611-netfilter_match_bypass_default_table.patch b/target/linux/generic/patches-3.9/611-netfilter_match_bypass_default_table.patch
new file mode 100644 (file)
index 0000000..10f9250
--- /dev/null
+++ b/target/linux/generic/patches-3.9/611-netfilter_match_bypass_default_table.patch
@@ -0,0 +1,81 @@
+--- a/net/ipv4/netfilter/ip_tables.c
++++ b/net/ipv4/netfilter/ip_tables.c
+@@ -309,6 +309,33 @@ struct ipt_entry *ipt_next_entry(const s
+       return (void *)entry + entry->next_offset;
+ }
+ 
++static bool
++ipt_handle_default_rule(struct ipt_entry *e, unsigned int *verdict)
++{
++      struct xt_entry_target *t;
++      struct xt_standard_target *st;
++
++      if (e->target_offset != sizeof(struct ipt_entry))
++              return false;
++
++      if (!(e->ip.flags & IPT_F_NO_DEF_MATCH))
++              return false;
++
++      t = ipt_get_target(e);
++      if (t->u.kernel.target->target)
++              return false;
++
++      st = (struct xt_standard_target *) t;
++      if (st->verdict == XT_RETURN)
++              return false;
++
++      if (st->verdict >= 0)
++              return false;
++
++      *verdict = (unsigned)(-st->verdict) - 1;
++      return true;
++}
++
+ /* Returns one of the generic firewall policies, like NF_ACCEPT. */
+ unsigned int
+ ipt_do_table(struct sk_buff *skb,
+@@ -333,6 +360,25 @@ ipt_do_table(struct sk_buff *skb,
+       ip = ip_hdr(skb);
+       indev = in ? in->name : nulldevname;
+       outdev = out ? out->name : nulldevname;
++
++      IP_NF_ASSERT(table->valid_hooks & (1 << hook));
++      local_bh_disable();
++      addend = xt_write_recseq_begin();
++      private = table->private;
++      cpu        = smp_processor_id();
++      table_base = private->entries[cpu];
++      jumpstack  = (struct ipt_entry **)private->jumpstack[cpu];
++      stackptr   = per_cpu_ptr(private->stackptr, cpu);
++      origptr    = *stackptr;
++
++      e = get_entry(table_base, private->hook_entry[hook]);
++      if (ipt_handle_default_rule(e, &verdict)) {
++              ADD_COUNTER(e->counters, skb->len, 1);
++              xt_write_recseq_end(addend);
++              local_bh_enable();
++              return verdict;
++      }
++
+       /* We handle fragments by dealing with the first fragment as
+        * if it was a normal packet.  All other fragments are treated
+        * normally, except that they will NEVER match rules that ask
+@@ -347,18 +393,6 @@ ipt_do_table(struct sk_buff *skb,
+       acpar.family  = NFPROTO_IPV4;
+       acpar.hooknum = hook;
+ 
+-      IP_NF_ASSERT(table->valid_hooks & (1 << hook));
+-      local_bh_disable();
+-      addend = xt_write_recseq_begin();
+-      private = table->private;
+-      cpu        = smp_processor_id();
+-      table_base = private->entries[cpu];
+-      jumpstack  = (struct ipt_entry **)private->jumpstack[cpu];
+-      stackptr   = per_cpu_ptr(private->stackptr, cpu);
+-      origptr    = *stackptr;
+-
+-      e = get_entry(table_base, private->hook_entry[hook]);
+-
+       pr_debug("Entering %s(hook %u); sp at %u (UF %p)\n",
+                table->name, hook, origptr,
+                get_entry(table_base, private->underflow[hook]));